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Armstrong World Industries

awi · NYSE Industrials
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FY2020 Annual Report · Armstrong World Industries
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ARMSTRONG WORLD INDUSTRIES, INC.

2020 ANNUAL REPORT

SHARE PERFORMANCE GRAPH

The following graph shows the cumulative total shareholder return for Armstrong World Industries, Inc. Common Shares
(NYSE: AWI) during the period from December 31, 2015 to December 31, 2020. The graph also shows the cumulative
returns of the NYSE Composite Index and a building materials peer group composed of the companies listed below the chart.
The performance shown in the chart should not be considered indicative of future performance.

COMPARISON OF CUMULATIVE TOTAL RETURN

Armstrong World Industries, Inc.

NYSE Composite Index

Peer Group Index

$275

$250

$225

$200

$175

$150

$125

$100

$75

$50

$25

$0

Dec-15

Dec-16

Dec-17

Dec-18

Dec-19

Dec-20

ASSUMES $100 INVESTED ON DEC 31, 2015
ASSUMES DIVIDENDS REINVESTED
FISCAL YEAR ENDING DEC. 31, 2020

Comparison of cumulative total return of one or more companies, peer groups, industry indexes, and/or broad markets
Period Ending

Company/Market/Peer Group
Armstrong World Industries, Inc.
NYSE Composite Index
Peer Group Index

12/31/2015 12/31/2016 12/31/2017 12/31/2018 12/31/2019 12/31/2020
$191.81
$163.68
$194.67

$105.47
$112.08
$108.94

$100.00
$100.00
$100.00

$152.78
$133.26
$145.81

$239.72
$152.85
$160.69

$147.26
$121.54
$112.01

The client-selected peer group is composed of the following companies:
(Market Cap is the base year)

Allegion PLC
A.O. Smith Corporation
Apogee Enterprises, Inc.
Acuity Brands, Inc.
Masonite International Corp.
Fortune Brands Home & Security, Inc.
James Hardie Industries
Lennox International inc.
Masco Corporation
Mohawk Industries, Inc.
Cornerstone Building Brands Inc
Owens Corning
Sherwin-Williams Company
Simpsons Manufacturing Co., Inc.
Interface, Inc.

% of Total Market Cap

6%
7%
1%
8%
2%
9%
5%
6%
9%
14%
1%
5%
24%
2%
1%
100%

d

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K

(Mark One)
☒☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF

1934

☐☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE

ACT OF 1934

For the fiscal year ended December 31, 2020

OR

For the transition period from

to

Commission File Number 1-2116
ARMSTRONG WORLD INDUSTRIES, INC.
(Exact name of registrant as specified in its charter)

Pennsylvania
(State or other jurisdiction of
incorporation or organization)

2500 Columbia Avenue, Lancaster, Pennsylvania
(Address of principal executive offices)

23-0366390
(I.R.S. Employer
Identification No.)

17603
(Zip Code)

Registrant’s telephone number, including area code (717) 397-0611

Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock, $0.01 par value per share

Trading
Symbol(s)
AWI

Name of each exchange on which registered
New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ No ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months, and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405
of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter time period that the registrant was required to
submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or
an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging
growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filer
Non-accelerated filer
Emerging growth company

Accelerated filer
Smaller reporting company

☒
☐
☐

☐
☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any
new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal
control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that
prepared or issued its audit report. ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ☐ No ☒

The aggregate market value of the Common Stock of Armstrong World Industries, Inc. held by non-affiliates based on the closing price ($77.96 per
share) on the New York Stock Exchange (trading symbol AWI) as of June 30, 2020 was approximately $3.7 billion. As of February 17, 2021, the
number of shares outstanding of the registrant's Common Stock was 47,788,314.

Documents Incorporated by Reference

Certain sections of Armstrong World Industries, Inc.’s definitive Proxy Statement for use in connection with its 2021 annual meeting of shareholders,
to be filed no later than April 30, 2021 (120 days after the last day of our 2020 fiscal year), are incorporated by reference into Part III of this Form
10-K Report where indicated.

TABLE OF CONTENTS

Cautionary Note Regarding Forward-Looking Statements .........................................................................................

PART I
Business .......................................................................................................................................................................
Risk Factors .................................................................................................................................................................
Unresolved Staff Comments ........................................................................................................................................
Properties .....................................................................................................................................................................
Legal Proceedings........................................................................................................................................................
Mine Safety Disclosures ..............................................................................................................................................

PART II
Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity

Securities.................................................................................................................................................................
Selected Financial Data................................................................................................................................................
Management’s Discussion and Analysis of Financial Condition and Results of Operations......................................
Quantitative and Qualitative Disclosures About Market Risk.....................................................................................
Financial Statements and Supplementary Data............................................................................................................
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure......................................
Controls and Procedures ..............................................................................................................................................
Other Information ........................................................................................................................................................

PART III
Directors, Executive Officers and Corporate Governance ..........................................................................................
Executive Compensation .............................................................................................................................................
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters ...................
Certain Relationships and Related Transactions, and Director Independence ............................................................
Principal Accountant Fees and Services ......................................................................................................................

PART IV
Exhibits and Financial Statement Schedules ...............................................................................................................
Form 10-K Summary ...................................................................................................................................................

Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.

Item 5.

Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.

Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

Item 15.
Item 16.

Signatures .........................................................................................................................................................................................

PAGE

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When we refer to “AWI,” the “Company,” “we,” “our” and “us”, we are referring to Armstrong World Industries, Inc. and its subsidiaries.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements in this Annual Report on Form 10-K and the documents incorporated by reference may constitute forward-looking
statements within the meaning of the Private Securities Litigation Reform Act of 1995. Those forward-looking statements are subject
to various risks and uncertainties and include all statements that are not historical statements of fact and those regarding our intent,
belief or expectations, including, but not limited to, our expectations concerning our residential and commercial markets and their
effect on our operating results; the impacts of COVID-19 on our business; our expectations regarding the payment of dividends; and
our ability to increase revenues, earnings and earnings before interest, taxes, depreciation and amortization (as discussed below).
Words such as “anticipate,” “expect,” “intend,” “plan,” “target,” “project,” “predict,” “believe,” “may,” “will,” “would,” “could,”
“should,” “seek,” “estimate” and similar expressions are intended to identify such forward-looking statements. These statements are
based on management’s current expectations and beliefs and are subject to a number of factors that could lead to actual results
materially different from those described in the forward-looking statements. Although we believe that the assumptions underlying the
forward-looking statements are reasonable, we can give no assurance that our expectations will be attained. Factors that could have a
material adverse effect on our financial condition, liquidity, results of operations or future prospects or which could cause actual
results to differ materially from our expectations include, but are not limited to:

Risks Related to Our Operations

•

•

•

•

•

key customers;

availability and costs of raw materials and energy;

Worthington Armstrong Venture (“WAVE”), our joint venture with Worthington Industries, Inc;

costs savings and productivity initiatives;

labor;

Risks Related to Our Strategy

•

•

strategic transactions;

digitalization initiatives and new technology;

Risks Related to Financial Matters

•

•

•

•

•

•

negative tax consequences;

covenants in our debt agreements;

our indebtedness;

our liquidity;

defined benefit plan obligations;

the tax consequences of the separation of our flooring business from our ceilings business;

Risks Related to Legal and Regulatory Matters

•

•

•

•

•

•

environmental matters;

litigation;

claims;

sustainability;

intellectual property rights;

international operations;

Risks Related to General Economic and Other Factors

•

•

•

•

•

•

•

•

economic conditions;

construction activity;

competition;

customer consolidation;

geographic concentration;

information technology disruptions and cybersecurity breaches;

dividend payments;

public health epidemics or pandemics (like COVID-19); and

3

•

other risks detailed from time to time in our filings with the Securities and Exchange Commission (the “SEC”), press
releases and other communications, including those set forth under “Risk Factors” included elsewhere in this Annual
Report on Form 10-K.

Such forward-looking statements speak only as of the date they are made. We expressly disclaim any obligation to release publicly
any updates or revisions to any forward-looking statements to reflect any change in our expectations with regard thereto or change in
events, conditions or circumstances on which any statement is based.

4

ITEM 1. BUSINESS

PART I

Armstrong World Industries, Inc. (“AWI” or the “Company”) is a Pennsylvania corporation incorporated in 1891. When we refer to
“we,” “our” and “us” in this report, we are referring to AWI and its subsidiaries.

We are a leading producer of ceiling systems for use in the construction and renovation of commercial and residential buildings. We
design, manufacture and sell ceiling and wall systems (primarily mineral fiber, fiberglass wool, metal, wood, wood fiber, glass-
reinforced-gypsum and felt) throughout the Americas.

As an Americas-based ceilings and walls company, we are focused on driving profitable topline growth by growing our core business
and expanding into new, adjacent business categories and sectors. Our key strategic initiatives aim to align to these objectives and
leverage our strengths. Our initiatives are designed to enable us to: (i) lead in innovation and launch new products; (ii) expand our
portfolio of solutions and manufacturing capabilities through a pipeline of acquisitions, partnerships and alliances, as well as new
programs focused on the sustainability of our products and operations; (iii) lead in solutions design; (iv) expand category and sector
access within the commercial and residential construction markets; (v) build and deliver compelling value propositions; and (vi)
optimize service to our customers.

Through our expanding architectural specialties offerings, bolstered by our recent acquisitions, our continuously evolving innovative
core ceilings portfolio, including our Healthy Spaces products, Total Acoustics® solutions and Sustain® family of products; and our
development of digitally enabled systems and tools, we are increasing our capabilities to sell into more spaces and sell more into every
space.

Acquisitions

In December 2020, we acquired all of the issued and outstanding equity of Arktura LLC (“Arktura”) and certain subsidiaries with
operations in the United States and Argentina. Arktura is a designer and fabricator of metal and felt ceilings, walls, partitions and
facades with one manufacturing facility based in Los Angeles, California.

In August 2020, we acquired the business and assets of Moz Designs, Inc. (“Moz”), based in Oakland, California. Moz is a designer
and fabricator of custom architectural metal ceilings, walls, dividers and column covers for interior and exterior applications with one
manufacturing facility.

In July 2020, we acquired all of the issued and outstanding capital stock of TURF Design, Inc. (“Turf”), with one manufacturing
facility in Elgin, Illinois and a design center in Chicago, Illinois. Turf is a designer and manufacturer of acoustic felt ceilings and wall
products.

In November 2019, we acquired the business and assets of MRK Industries, Inc. (“MRK”), based in Libertyville, Illinois. MRK is a
manufacturer of specialty metal ceiling, wall and exterior solutions with one manufacturing facility.

In March 2019, we acquired the business and assets of Architectural Components Group, Inc. (“ACGI”), based in Marshfield,
Missouri. ACGI is a manufacturer of custom wood ceilings and walls with one manufacturing facility.

In August 2018, we acquired the business and assets of Steel Ceilings, Inc. (“Steel Ceilings”), based in Johnstown, Ohio. Steel
Ceilings is a manufacturer of aluminum and stainless metal ceilings that include architectural, radiant and security solutions with one
manufacturing facility.

In May 2018, we acquired the business and assets of Plasterform, Inc. (“Plasterform”), based in Mississauga, Ontario, Canada.
Plasterform is a manufacturer of architectural cast ceilings, walls, facades, columns and moldings with one manufacturing facility.

The operations, assets and liabilities of these acquisitions are included in our Architectural Specialties segment.

Discontinued Operations

On September 30, 2019, we completed the sale of certain subsidiaries comprising our businesses and operations in Europe, the Middle
East and Africa (including Russia) (“EMEA”) and the Pacific Rim, including the corresponding businesses and operations conducted
by Worthington Armstrong Venture (“WAVE”), our joint venture with Worthington Industries, Inc. (“Worthington”) in which AWI
holds a 50% interest (collectively, the “Sale”), to Knauf International GmbH (“Knauf”). The purchase price of $330.0 million was
previously paid by Knauf to us during 2018 and was subject to certain post-closing adjustments for cash and debt as provided in the

5

Purchase Agreement dated as of November 17, 2017, by and between us and Knauf (the “Purchase Agreement”), including
adjustments based on the economic impact of any required regulatory remedies and a working capital adjustment. During 2020, we
remitted $25.9 million to WAVE for their remaining portion of the proceeds from Knauf. Also during 2020, WAVE paid each of AWI
and Worthington dividends of $13.0 million relating to these payments. During the third quarter of 2020, we remitted $6.4 million to
Knauf for working capital and other adjustments. In January 2021, we finalized the post-closing adjustments to purchase price related
to certain pension liabilities assumed by Knauf in the Sale. During the fourth quarter of 2020, we recorded a $12.0 million loss
primarily related to this purchase price adjustment, which is reflected within accounts payable and accrued expenses as of December
31, 2020.

In 2019, we entered into a Transition Services Agreement with Knauf for its benefit and the benefit of a buyer of certain businesses
divested by Knauf, pursuant to which we provided certain transition technology, finance and information technology support services.
The Transition Services Agreement expired in 2020. In connection with the closing of the Sale, we also entered into (i) a royalty-free
intellectual property License Agreement with Knauf under which they, and the buyers of certain businesses divested by Knauf, license
patents, trademarks and know-how from us for use in licensed territories in which the business was conducted prior to the Sale, and
(ii) a Supply Agreement with Knauf under which the parties may continue to purchase certain products from each other following the
closing of the Sale. WAVE also entered into similar agreements with Knauf for such purposes. The term of the granted licenses, with
respect to each intellectual property right, extend until the expiration or abandonment of each such intellectual property right.

The EMEA and Pacific Rim segment historical financial results through September 30, 2019 have been reflected in AWI’s
Consolidated Statements of Operations and Comprehensive Income as discontinued operations for all periods presented, while the
assets and liabilities of discontinued operations have been removed from AWI’s Consolidated Balance Sheet as of December 31,
2019.

See Notes 5 and 6 to the Consolidated Financial Statements for additional information related to our acquisitions and discontinued
operations.

Markets

We are well positioned in the industry sectors and categories in which we operate, often holding a leadership position. Our products
compete against mineral fiber and fiberglass products from other manufacturers, as well as drywall and a wide range of specialty
ceiling products. We compete directly with other domestic and international suppliers of these products. The major markets in which
we compete are:

Commercial Construction. Our revenue opportunities come from new construction as well as renovation of existing buildings.
Renovation work (also known as replacement/remodel) is estimated to represent the majority of the commercial market opportunity.
Most of our revenue comes from the following sectors of commercial construction – office, education, transportation, healthcare and
retail. We monitor U.S. construction starts and project activity. Our revenue from new construction can lag behind construction starts
by as much as 24 months. We also monitor office vacancy rates, the Architecture Billings Index, state and local government
spending, gross domestic product (“GDP”) and general employment levels, which can indicate movement in renovation and new
construction opportunities. We believe that these statistics, taking into account the time-lag effect, provide a reasonable indication of
our future revenue opportunity from commercial renovation and new construction. Additionally, we believe that customer preferences
for product type, style, color, performance attributes (such as acoustics, sustainability and health attributes), availability, affordability
and ease of installation also affect our revenue.

In our Mineral Fiber segment, we estimate that a majority of our commercial construction market sales are used for existing building
renovation purposes by end-users of our products. In our Architectural Specialties segment, we estimate that a majority of our
commercial market sales are used for new building construction by end-users of our products. The end-use of our products is based on
management estimates as such information is not easily determinable.

Residential Construction. We also sell mineral fiber products for use in single and multi-family housing. We estimate that existing
home renovation work represents the majority of the residential construction market opportunity. Key U.S. statistics that indicate
market opportunity include existing home sales (a key indicator for renovation opportunity), housing starts, housing completions,
home prices, interest rates and consumer confidence.

Customers

We use our reputation, capabilities, service, innovation and brand recognition to develop long-standing relationships with our
customers. We principally sell commercial products to building materials distributors, who re-sell our products to contractors,
subcontractors’ alliances, large architect and design firms, and major facility owners. We have important relationships with national

6

home centers such as Lowe’s Companies, Inc. and The Home Depot, Inc., with wholesalers who re-sell our products to dealers who
service builders, contractors and consumers, and also with architects and designers who specify products.

In 2020, approximately 70% of our consolidated net sales are to distributors. Sales to large home centers accounted for approximately
10% of our consolidated net sales. Our remaining sales are primarily to direct customers and retailers.

Gross sales to commercial distributors GMS Inc. and Foundation Building Materials, Inc. totaled $370.3 million and individually
exceeded 10% of our consolidated gross sales in 2020. These sales were included within our Mineral Fiber and Architectural
Specialties segments.

Working Capital

We produce goods for inventory and sell on credit to our customers. Generally, our distributors carry inventory as needed to meet
local or rapid delivery requirements. We sell our products to select, pre-approved customers using customary trade terms that allow
for payment in the future. These practices are typical within the industry.

Competition

The markets in which our products are sold are highly competitive. Principal attributes of competition include product performance,
product styling, service and price. Competition comes from both domestic and international manufacturers. Additionally, some of our
products compete with alternative products or finishing solutions, namely, drywall and exposed structure (also known as open
plenum). Excess industry capacity exists for certain products, which tends to increase price competition. The following companies
are our primary competitors:

CertainTeed Corporation (a subsidiary of Saint-Gobain), Chicago Metallic Corporation (owned by Rockwool International A/S),
Georgia-Pacific Corporation, Rockfon A/S (owned by Rockwool International A/S), USG Corporation (owned by Gebr. Knauf KG),
Ceilings Plus (owned by USG Corporation), Rulon International, and 9Wood.

Raw Materials

We purchase raw materials from numerous suppliers worldwide in the ordinary course of business. The principal raw materials
include: clays, felt, fiberglass, perlite, pigment, recycled paper, starch, wood and wood fiber. We manufacture most of the production
needs for mineral wool at one of our manufacturing facilities. Finally, we use aluminum and steel in the production of metal ceilings
by us and by WAVE, our joint venture that manufactures ceiling grid.

We also purchase significant amounts of packaging materials and consume substantial amounts of energy, such as electricity and
natural gas, and water.

In general, adequate supplies of raw materials are available to all of our operations. However, availability can change for a number of
reasons, including environmental conditions, laws and regulations, shifts in demand by other industries competing for the same
materials, transportation disruptions and/or business decisions made by, or events that affect, our suppliers. There is no assurance that
these raw materials will remain in adequate supply to us.

Prices for certain high usage raw materials can fluctuate dramatically. Cost increases for these materials can have a significant
adverse impact on our manufacturing costs. Given the competitiveness of our markets, we may not be able to recover the increased
manufacturing costs through increasing selling prices to our customers.

Sourced Products

Some of the products that we sell are sourced from third parties. Our primary sourced products include specialty ceiling products. We
purchase some of our sourced products from suppliers that are located outside of the U.S., primarily from Europe and the Pacific Rim.
Sales of sourced products represented approximately 9% of our total consolidated revenue in 2020.

In general, we believe we have adequate supplies of sourced products. However, we cannot guarantee that the supply will remain
adequate.

7

Seasonality

Generally, our sales tend to be stronger in the second and third quarters of our fiscal year due to more favorable weather conditions,
customer business cycles and the timing of renovation and new construction. In comparison to the prior year, sales were weaker in the
second through fourth quarters of 2020 due to reduced demand related to COVID-19. See Management’s Discussion and Analysis of
Financial Condition and Results of Operations in Item 7 of this Form 10-K for further information.

Patent and Intellectual Property Rights

Patent protection is important to our business. Our competitive position has been enhanced by patents on products and processes
developed or perfected within AWI or obtained through acquisitions and licenses. In addition, we benefit from our trade secrets for
certain products and processes.

Patent protection extends for varying periods according to the date of patent filing or grant and the legal term of a patent in the various
countries where patent protection is obtained. The actual protection afforded by a patent, which can vary from country to country,
depends upon the type of patent, the scope of its coverage and the availability of legal remedies. Although we consider that, in the
aggregate, our patents, licenses and trade secrets constitute a valuable asset of material importance to our business, we do not believe
we are materially dependent upon any single patent or trade secret, or any group of related patents or trade secrets.

Certain of our trademarks, including without limitation,
AirAssure™, Airtite®, Arktura®, Calla®, Cirrus®, Cortega®, DESIGNFlex®, Dune™, Feltworks®, Humiguard®, Infusions®,
InvisAcoustics™, Kanopi™, Lyra®, MetalWorks™, Moz™, Optima®, Plasterform™, Soundscapes®, Sustain®, Tectum®, Total
Acoustics®, Turf®, Ultima®, and WoodWorks®, are important to our business because of their significant brand name
recognition. Registrations are generally for fixed, but renewable, terms.

, Armstrong®, 24/7 Defend™, ACOUSTIBuilt™,

In connection with the separation and distribution of our former flooring business into a separate publicly-traded company, Armstrong
Flooring, Inc. (“AFI”), in 2016, we entered into several agreements with AFI that, together with a plan of division, provided for the
separation and allocation of assets between AWI and AFI. These agreements include a Trademark License Agreement and a
Transition Trademark License Agreement. Pursuant to the Trademark License Agreement, AWI provided AFI with a perpetual,
royalty-free license to utilize the “Armstrong” trade name and logo. Pursuant to the Transition Trademark License Agreement, AFI
provided us with a royalty-free license to utilize the “Inspiring Great Spaces” tagline, logo and related color scheme, which expires
December 31, 2021.

In connection with the closing of the Sale, we entered into a royalty-free intellectual property License Agreement with Knauf for its
benefit (and, under sublicense, to the buyers of certain businesses divested by Knauf) under which they license certain patents,
trademarks and know-how from us for use in certain licensed territories.

We review the carrying value of indefinite-lived trademarks at least annually for potential impairment. See the “Critical Accounting
Estimates” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations in Item 7 of this Form
10-K for further information.

Sustainability and Environmental Matters

As a leading building products manufacturer, we are committed to operating sustainably across all areas of our business. This
commitment is reflected in our ongoing initiatives to design and develop sustainable ceiling and wall products and solutions for every
space. Sustainability in our business reflects our mission to make a difference in the lives of people where they live, work, learn, heal
and play. Sustainability is designed to support our strategic priorities, align with stakeholder interests, and be visible and measurable.

Our sustainability function is organized around three program “pillars”: People, Planet and Product.

Under the People pillar of our program, we are broadly focused on increasing our engagement in the communities where we operate,
evaluating our benefits and compensation structure for all levels of the organization, promoting and maintaining a diverse, talented
and growing workforce, encouraging and protecting human rights, and creating a safe working environment for our employees.

Under the Planet pillar of our program, we are broadly focused on reducing our greenhouse gas footprint, reducing or recapturing
water in our operations, and reducing waste in our operations. These efforts include our ceilings recycling program, which diverts
reclaimed ceiling tiles from landfills, and our reduction of our environmental operating footprint. Additionally, we are committed to
complying with all environmental laws and regulations that are applicable to our operations.

8

Under the Product pillar of our program, we are broadly focused on ensuring our products are free of chemicals of concern, reducing
our products’ water and greenhouse gas footprint, and continuing to invest in solutions that meet customer demand for building
products that align with their sustainability goals. We expect that there will be increased demand over time for products, systems and
services that meet evolving regulatory and customer sustainability standards and preferences and decreased demand for products that
produce significant greenhouse gas emissions. We also believe that our ability to continue to provide these products, systems and
services to our customers, including through our Sustain® portfolio, will be necessary to maintain our competitive position in the
marketplace.

The adoption of environmentally responsible building codes and standards such as the Leadership in Energy and Environmental
Design (“LEED”) rating system established by the U.S. Green Building Council, has the potential to increase demand for products,
systems and services that contribute to building sustainable spaces. Many of our products meet the requirements for the award of
LEED credits, and we are continuing to develop new products, systems and services to address market demand for products that
enable construction of buildings that require fewer natural resources to build, operate and maintain. Our competitors also have
developed and introduced to the market products with an increased focus on sustainability.

Human Capital

Workforce Demographics. As of December 31, 2020 and 2019, we had approximately 2,700 and 2,500 full time and part time
employees, respectively. The increase in employees was primarily attributable to the acquisitions of Arktura, Moz and Turf during
2020. During 2020, our total voluntary and involuntary turnover rates were approximately 5% and 3%, respectively, for non-
production employees and 12% and 6%, respectively, for production employees.

As of December 31, 2020, approximately 59% of our approximately 1,300 production employees in the U.S. were represented by
labor unions. Collective bargaining agreements covering approximately 500 employees at two U.S. plants will expire during 2021.
We believe that our relations with our employees are constructive and positive.

Employee Health and Safety. Safety is a core value at Armstrong and our culture is committed to making safety a personal core value
for every employee. Our overall goal is to eliminate workplace injuries. We promote and foster an environment of empowerment and
sharing throughout the company at all levels and in all locations. We engage our employees on safety with a focus on risk
identification and elimination and through various leading indicators. We track Occupational Safety and Health Administration
(“OSHA”) recordable injuries and lost time rates by location monthly. We establish safety targets annually, which are tracked and
reported to leadership monthly and reviewed with our Board of Directors.

We offer competitive health and wellness benefits to eligible employees and periodically conduct analyses of plan utilization to further
tailor our employee benefits to meet their ongoing needs. In response to COVID-19, we continue to follow guidelines from
governmental and local health authorities across our facilities and have implemented preventative measures that include working
remotely, providing personal protective equipment, limiting group meetings, enhancing cleaning and sanitizing procedures, and social
distancing. Employees who can meet our customer commitments remotely are doing so, and a significant portion of our workforce
began teleworking in mid-March 2020 and were continuing to telework as of December 31, 2020. During 2020, we implemented an
Emergency Paid Leave policy for all employees which expired on December 31, 2020. This policy granted additional paid time off for
any employee impacted by COVID-19. We implemented a COVID Leave Program effective January 1, 2021 that continues to provide
similar benefits for employees impacted by COVID-19.

Diversity and Inclusion. We continue to take steps to expand our role as an employer that champions diversity and inclusion, as we
believe it is a key to our future success. This commitment is most recently reflected in the goals of the People Pillar of our
Sustainability program, which is being led by our VP Talent Sustainability, who was hired in 2020. We measure gender and
racial/ethnic representation and are focusing on our incoming new hires to assist in increasing diversity within the company. In
addition, we are committed to engaging in events and outreach that align with our goals to enhance our diversity and inclusion. Our
strategy to grow our diversity over time includes (1) providing annual training to employees on diversity and inclusion topics, (2)
demonstrating year over year improvement in the diversity of our organization measured by representation of female, minorities and
veterans at every level of the organization, and (3) providing employees an annual opportunity to share their views on topics that
matter to them.

Research & Development

Research and development (“R&D”) activities are important and necessary in helping us improve our products’ competitiveness.
Principal R&D functions include the development and improvement of products and manufacturing processes.

9

Legal and Regulatory Proceedings

Regulatory activities of particular importance to our operations include proceedings under the Comprehensive Environmental
Response, Compensation and Liability Act (“CERCLA”), and state Superfund and similar type environmental laws governing existing
or potential environmental contamination at two domestically owned locations allegedly resulting from past industrial activity. We are
one of several potentially responsible parties in these matters and have agreed to jointly fund required investigation, while preserving
our defenses to the liability. We may also have rights of contribution or reimbursement from other parties or coverage under
applicable insurance policies.

Most of our facilities are affected by various federal, state and local environmental requirements relating to the discharge of materials
or the protection of the environment. We make expenditures necessary for compliance with applicable environmental requirements at
each of our operating facilities. We have not experienced a material adverse effect upon our capital expenditures or competitive
position as a result of environmental control legislation and regulations.

On September 8, 2017, Roxul USA, Inc. (d/b/a Rockfon) (“Rockfon”) filed litigation against us in the United States District Court for
the District of Delaware (the “Court”) alleging anticompetitive conduct seeking remedial measures and unspecified damages. Roxul
USA, Inc. is a significant ceilings systems competitor with global headquarters in Europe and expanding operations in the Americas.
On April 3, 2019, we entered into a confidential settlement agreement with Rockfon to fully resolve the litigation between us, and
Rockfon filed a Stipulation of Dismissal with Prejudice (“Dismissal”) with the Court. Pursuant to the Dismissal, Rockfon formally
dismissed all claims it had against AWI with prejudice. All claims in the litigation have been fully and finally dismissed and released
with AWI making a payment to Rockfon for its costs, expenses and attorneys’ fees. Pursuant to the settlement, both parties
acknowledged that (a) AWI denies all claims of wrongdoing and makes no admission of wrongdoing or of the truth of any of the
claims or allegations contained in Rockfon’s complaint or otherwise alleged in the litigation; (b) all AWI exclusive distribution
locations (i.e., any location where a reseller has agreed to sell only AWI ceiling system products) will remain exclusive to AWI under
their respective distribution agreements, and (c) in all other non-exclusive or “open” distribution locations, resellers are free to
purchase and resell ceiling systems products of any manufacturer at their discretion. During 2019, we incurred $19.7 million of
expenses in connection with the matter, primarily relating to legal and professional fees incurred by us in connection with the
litigation, including expenses and attorney’s fees paid under the settlement agreement. As a result of the settlement and Dismissal, we
do not expect to incur additional future costs or expenses relating to the matter.

From time to time, we are involved in various other lawsuits, claims, investigations and other legal matters that arise in the ordinary
course of business, including matters involving our products, intellectual property, relationships with suppliers, relationships with
distributors, relationships with competitors, employees and other matters. In connection with those matters, we may have rights of
contribution or reimbursement from other parties or coverage under applicable insurance policies. When applicable and appropriate,
we will pursue coverage and recoveries under those policies, but are unable to predict the outcome of those demands. While complete
assurance cannot be given to the outcome of any proceedings relating to these matters, we do not believe that any current claims,
individually or in the aggregate, will have a material adverse effect on our financial condition, liquidity or results of operations.

Liabilities of $1.2 million and $1.6 million as of December 31, 2020 and December 31, 2019, respectively, were recorded for
environmental liabilities that we consider probable and for which a reasonable estimate of the probable liability could be made. See
Note 27 to the Consolidated Financial Statements and Risk Factors in Item 1A of this Form 10-K, for information regarding the
possible effects that compliance with environmental laws and regulations may have on our businesses and operating results.

Website

We maintain a website at http://www.armstrongceilings.com. Information contained on our website is not incorporated into this
document. Annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, all amendments to those
reports and other information about us are available free of charge through this website as soon as reasonably practicable after the
reports are electronically filed with the SEC. Reference in this Form 10-K to our website and the SEC’s website is an inactive text
reference only.

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ITEM 1A. RISK FACTORS

Risks Related to Our Operations

Sales fluctuations to and changes in our relationships with key customers could have an adverse effect on our financial condition,
liquidity or results of operations.

The loss, reduction, or fluctuation of sales to key customers, including independent distributors, or any adverse change in our business
relationship with them, whether as a result of competition, industry consolidation or otherwise, could have a material adverse effect on
our financial condition, liquidity or results of operations.

If the availability of raw materials or energy decreases, or the costs increase, and we are unable to pass along increased costs, our
financial condition, liquidity or results of operations could be adversely affected.

The availability and cost of raw materials, packaging materials, energy and sourced products are critical to our operations and our
results of operations. For example, we use substantial quantities of natural gas and petroleum-based raw materials in our
manufacturing operations. The cost of some of these items has been volatile in recent years and availability has been limited at times.
We source some materials from a limited number of suppliers, which, among other things, increases the risk of unavailability.
Limited availability could cause us to reformulate products or limit our production. Decreased access to raw materials and energy or
significant increased cost to purchase these items and any corresponding inability to pass along such costs through price increases
could have a material adverse effect on our financial condition, liquidity or results of operations.

The performance of our WAVE joint venture is important to our financial results. Changes in the demand for, or quality of,
WAVE products, or in the operational or financial performance of the WAVE joint venture, could have an adverse effect on our
financial condition, liquidity or results of operations. Similarly, if there is a change with respect to our joint venture partner that
adversely impacts its relationship with us, WAVE’s performance could be adversely impacted.

Our equity investment in our WAVE joint venture remains important to our financial results. WAVE’s markets are highly competitive
and changes in the demand for, or quality of, WAVE products, or in the operational or financial performance of the WAVE joint
venture, could have a material adverse effect on its financial condition, liquidity or results of operations. Similarly, the availability and
cost of raw materials, packaging materials, energy and sourced products are critical to WAVE’s operations and its results of
operations.

We believe another important element in the success of this joint venture is the relationship with our partner, Worthington Industries,
Inc. If there is a change in ownership, a change of control, a change in management or management philosophy, a change in business
strategy or another event with respect to our partner that adversely impacts our relationship, WAVE’s performance could be adversely
impacted. In addition, our partner may have economic or business interests or goals that are different from or inconsistent with our
interests or goals, which may impact our ability to influence or align WAVE’s strategy and operations.

From time to time, we engage in cost-saving and productivity initiatives. Any such initiatives may not achieve expected savings in
our operating costs or improved operating results.

We aggressively look for ways to make our operations more efficient and effective. We may reduce, move, modify and expand our
plants and operations, as well as our sourcing and supply chain arrangements, as needed, to control costs and improve productivity.
Such actions involve substantial planning, often require capital investments and may result in charges for fixed asset impairments or
obsolescence and substantial severance costs. Our ability to achieve cost savings and other benefits within expected time frames is
subject to many estimates and assumptions. These estimates and assumptions are subject to significant economic, competitive and
other uncertainties, some of which are beyond our control. If these estimates and assumptions are incorrect, if we experience delays,
or if other unforeseen events occur, our financial condition, liquidity or results of operations could be materially and adversely
affected.

Increased costs of labor, labor disputes, work stoppages or union organizing activity could delay or impede production and could
have an adverse effect on our financial condition, liquidity or results of operations.

Increased costs of labor, including the costs of employee benefits plans, labor disputes, work stoppages or union organizing activity
could delay or impede production and have a material adverse effect on our financial condition, liquidity or results of operations. As
the majority of our manufacturing employees are represented by unions and covered by collective bargaining or similar agreements,
we often incur costs attributable to periodic renegotiation of those agreements, which may be difficult to project. We are also subject

11

to the risk that strikes or other conflicts with organized personnel may arise or that we may become the subject of union organizing
activity at our facilities that do not currently have union representation. Prolonged negotiations, conflicts or related activities could
also lead to costly work stoppages and loss of productivity.

Risks Related to Our Strategy

We may pursue strategic transactions, including mergers, acquisitions, joint ventures, strategic alliances or other investments,
which could create risks and present unforeseen integration obstacles or costs, any of which could have an adverse effect our
financial condition, liquidity or results of operations.

We regularly evaluate potential mergers, acquisitions, joint ventures, strategic alliances or other investments that we believe could
complement, enhance or expand our current businesses or product lines or that might otherwise offer us growth opportunities. Any
such strategic transaction involves a number of risks, including potential disruption of our ongoing business and distraction of
management, difficulty with integrating or separating personnel and business operations and infrastructure, and increasing or
decreasing the scope, geographic diversity and complexity of our operations. Strategic transactions could involve payment by us of a
substantial amount of cash, assumption of liabilities and indemnification obligations, regulatory requirements, incurrence of a
substantial amount of debt or issuance of a substantial amount of equity. Certain strategic opportunities may not result in the
consummation of a transaction or may fail to realize the intended benefits and synergies. If we fail to identify, consummate and
integrate our strategic transactions in a timely and cost-effective manner, our financial condition, liquidity or results of operations
could be materially and adversely affected.

We may not experience the anticipated benefits from our strategic initiatives, including investments in digitalization and new
technology.

We continue to evaluate and may pursue strategic initiatives involving the development or utilization of new or innovative products,
solutions and tools, as well as the expansion of our capabilities through digitalization. These initiatives are designed to grow revenue,
improve profitability and increase shareholder value. Our results of operations and financial position could be materially and adversely
affected if we are unable to successfully identify, execute and integrate these initiatives or if we are unable to complete these
initiatives in a timely and efficient manner to realize competitive advantages and opportunities.

Risks Related to Financial Matters

Negative tax consequences can have an unanticipated effect on our financial results.

We are subject to the tax laws of the many jurisdictions in which we operate. The tax laws are complex, and the manner in which they
apply to our operations and results is sometimes open to interpretation. Our income tax (benefit) expense and reported net (loss)
income may fluctuate significantly, and may be materially different than forecasted or experienced in the past. Our financial
condition, liquidity, results of operations or tax liability could be adversely affected by changes in effective tax rates, changes in our
overall profitability, changes in tax legislation, the results of examinations of previously filed tax returns, and ongoing assessments of
our tax exposures.

Our financial condition, liquidity, results of operations or tax liability could also be adversely affected by changes in the valuation of
deferred tax assets and liabilities. We have substantial deferred tax assets related to U.S. domestic foreign tax credits (“FTCs”), capital
loss carryforwards, and state net operating losses (“NOLs”), which are available to reduce our U.S. income tax liability and to offset
future state taxable income. However, our ability to utilize the current carrying value of these deferred tax assets may be impacted as
a result of certain future events, such as changes in tax legislation and insufficient future taxable income prior to expiration of the
FTCs, capital loss carryforwards, and NOLs.

12

The agreements that govern our indebtedness contain a number of covenants that impose significant operating and financial
restrictions, including restrictions on our ability to engage in activities that may be in our best long-term interests.

The agreements that govern our indebtedness include covenants that, among other things, may impose significant operating and
financial restrictions, including restrictions on our ability to engage in activities that may be in our best long-term interests. These
covenants may restrict our ability to:

•

•

•

•

•

•

incur additional debt;

pay dividends on or make other distributions in respect of our capital stock or redeem, repurchase or retire our capital
stock or subordinated debt or make certain other restricted payments;

make certain acquisitions;

sell certain assets;

consolidate, merge, sell or otherwise dispose of all or substantially all of our assets; and

create liens on certain assets to secure debt.

Under the terms of our senior secured credit facility, we are required to maintain specified leverage and interest coverage ratios. Our
ability to meet these ratios could be affected by events beyond our control, and we cannot assure that we will meet them. A breach of
any of the restrictive covenants or ratios would result in a default under the senior secured credit facility. If any such default occurs,
the lenders under the senior secured credit facility may be able to elect to declare all outstanding borrowings under our facilities,
together with accrued interest and other fees, to be immediately due and payable, or enforce their security interest. The lenders may
also have the right in these circumstances to terminate commitments to provide further borrowings.

Our indebtedness may adversely affect our cash flow and our ability to operate and invest in our business, execute on our strategic
initiatives and declare dividends on our capital stock.

Our level of indebtedness and degree of leverage could:

•

•

•

•

•

•

•

limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate;

make us more vulnerable to adverse changes in general economic, industry and competitive conditions and adverse
changes in government regulation;

place us at a competitive disadvantage compared to our competitors that are less leveraged and, therefore, more able to
take advantage of opportunities that our leverage prevents us from exploiting;

limit our ability to refinance existing indebtedness or borrow additional amounts for working capital, capital expenditures,
acquisitions, debt service requirements, execution of our business strategy or other purposes;

restrict our ability to pay dividends on our capital stock;

make it more difficult for us to satisfy our obligations with respect to our indebtedness; and

adversely affect our credit ratings, if any.

We may also incur additional indebtedness, which could exacerbate the risks described above. In addition, to the extent that our
indebtedness bears interest at floating rates, our sensitivity to interest rate fluctuations will increase.

Any of the above listed factors could have a material adverse effect on our financial condition, liquidity or results of operations.

We require a significant amount of liquidity to fund our operations, and borrowing has increased our exposure to negative
unforeseen events.

Our liquidity needs vary throughout the year. If our business experiences materially negative unforeseen events, we may be unable to
generate sufficient cash flow from operations to fund our needs or maintain sufficient liquidity to operate and remain in compliance
with our debt covenants, which could result in reduced or delayed planned capital expenditures and other investments and have a
material adverse effect on our financial condition or results of operations.

13

Significant changes in factors and assumptions used to measure our defined benefit plan obligations, actual investment returns on
pension assets and other factors could negatively impact our operating results and cash flows.

We maintain significant pension and postretirement plans in the U.S. The recognition of costs and liabilities associated with these
plans for financial reporting purposes is affected by assumptions made by management and used by actuaries engaged by us to
calculate the benefit obligations and the expenses recognized for these plans.

The inputs used in developing the required estimates are calculated using a number of assumptions, which represent management’s
best estimate of the future. The assumptions that have the most significant impact on reported results are the discount rate, the
estimated long-term return on plan assets for the funded plans, retirement rates, and mortality rates and, for postretirement plans, the
estimated inflation in health care costs. These assumptions are generally updated annually.

In the aggregate, our U.S. pension plans were overfunded by $79.0 million as of December 31, 2020. Our unfunded U.S.
postretirement plan liabilities were $81.4 million as of December 31, 2020. If our cash flows and capital resources are insufficient to
fund our pension and postretirement plans obligations, we could be forced to reduce or delay investments and capital expenditures,
seek additional capital, or restructure or refinance our indebtedness.

If the separation and distribution of Armstrong Flooring, Inc. (“AFI”) fails to qualify as a tax-free transaction for U.S. federal
income tax purposes, then AFI, AWI and AWI’s shareholders could be subject to significant tax liability or tax indemnity
obligations.

On April 1, 2016, we completed our previously announced separation of AFI by allocating the assets and liabilities related primarily to
the Resilient Flooring and Wood Flooring segments to AFI and then distributing the common stock of AFI to our shareholders at a
ratio of one share of AFI common stock for every two shares of AWI common stock. In connection with the distribution, we received
an opinion from our special tax counsel, on the basis of certain facts, representations, covenants and assumptions set forth in such
opinion, substantially to the effect that, for U.S. federal income tax purposes, the separation and distribution should qualify as a
transaction that generally is tax-free to us and our shareholders under Sections 355 and 368(a)(1)(D) of the Internal Revenue Code.

Notwithstanding the tax opinion, the Internal Revenue Service (“IRS”) could determine on audit that the distribution should be treated
as a taxable transaction if it determines that any of the facts, assumptions, representations or covenants set forth in the tax opinion is
not correct or has been violated, or that the distribution should be taxable for other reasons, including as a result of a significant
change in stock or asset ownership after the distribution, or if the IRS were to disagree with the conclusions of the tax opinion. If the
distribution is ultimately determined to be taxable, the distribution could be treated as a taxable dividend to each U.S. holder of our
common shares who receives shares of AFI in connection with the spinoff for U.S. federal income tax purposes, and such shareholders
could incur significant U.S. federal income tax liabilities. In addition, we and/or AFI could incur significant U.S. federal income tax
liabilities or tax indemnification obligations, whether under applicable law or the Tax Matters Agreement that we entered into with
AFI, if it is ultimately determined that certain related transactions undertaken in anticipation of the distribution are taxable.

Risks Related to Legal and Regulatory Matters

We may be subject to liability under, and may make substantial future expenditures to comply with, environmental laws and
regulations, which could have an adverse effect on our financial condition, liquidity or results of operations.

We are actively involved in environmental investigation and remediation activities relating to two domestically owned locations
allegedly resulting from past industrial activity, for which our ultimate liability may exceed the currently estimated and accrued
amounts. See Note 27 to the Consolidated Financial Statements for further information related to our current environmental matters
and the potential liabilities associated therewith. It is also possible that we could become subject to additional environmental matters
and corresponding liabilities in the future.

The building materials industry has been subject to claims relating to raw materials such as silicates, polychlorinated biphenyl
(“PCB”), polyvinyl chloride (“PVC”), formaldehyde, fire-retardants and claims relating to other issues such as mold and toxic fumes,
as well as claims for incidents of catastrophic loss, such as building fires. We have not received any significant claims involving our
raw materials or our product performance; however, product liability insurance coverage may not be available or adequate in all
circumstances to cover claims that may arise in the future.

In addition, our operations are subject to various environmental, health, and safety laws and regulations. These laws and regulations
not only govern our current operations and products, but also impose potential liability on us for our past operations. Our costs to
comply with these laws and regulations may increase as these requirements become more stringent in the future, and these increased
costs may have a material adverse effect on our financial condition, liquidity or results of operations.

14

Adverse results caused by regulatory actions, product claims, environmental claims and other litigation could be costly. Insurance
coverage may not be available or adequate in all circumstances.

In the ordinary course of business, we are subject to various claims and litigation. Any such claims, whether with or without merit,
could be time consuming and expensive to defend and could divert management’s attention and resources. While we strive to ensure
that our products comply with applicable government regulatory standards and internal requirements, and that our products perform
effectively and safely, customers from time to time could claim that our products do not meet warranty or contractual requirements,
and users could claim to be harmed by use or misuse of our products. These claims could give rise to breach of contract, warranty or
recall claims, or claims for negligence, product liability, strict liability, personal injury or property damage. They could also result in
negative publicity.

In addition, claims and investigations may arise related to patent infringement, distributor relationships, commercial contracts,
antitrust or competition law requirements, employment matters, employee benefits issues, and other compliance and regulatory
matters, including anti-corruption and anti-bribery matters. While we have processes and policies designed to mitigate these risks and
to investigate and address such claims as they arise, we cannot predict or, in some cases, control the costs to defend or resolve such
claims.

We currently maintain insurance against some, but not all, of these potential claims. In the future, we may not be able to maintain
insurance at commercially acceptable premium levels. In addition, the levels of insurance we maintain may not be adequate to fully
cover any and all losses or liabilities. If any significant judgment or claim is not fully insured or indemnified against, it could have a
material adverse impact. We cannot assure that the outcome of all current or future claims will not have a material adverse effect on
our financial condition, liquidity or results of operations.

Increased focus by governmental and non-governmental organizations, customers, consumers and investors
on sustainability issues, including those related to climate change, may have an adverse effect on our business, financial condition
and results of operations and damage our reputation.

Increased focus by governmental and non-governmental organizations, customers, consumers and investors on sustainability issues,
including those related to climate change, may have a material adverse effect on our business, financial condition and results of
operations and damage our reputation. As climate change, land use, water use, deforestation, recyclability or recoverability of
products, and other sustainability concerns become more prevalent, governmental and non-governmental organizations, customers,
consumers and investors are increasingly focusing on these issues. This increased focus on environmental issues and sustainability
may result in new or increased regulations and customer and investor demands that could cause us to incur additional costs or to make
changes to our operations to comply with any such regulations and demands.

Our intellectual property rights may not provide meaningful commercial protection for our products or brands, which could
adversely impact our financial condition, liquidity or results of operations.

We rely on our proprietary intellectual property, including numerous patents and registered trademarks, as well as our licensed
intellectual property to market, promote and sell our products. We monitor and protect against activities that might infringe, dilute, or
otherwise harm our patents, trademarks and other intellectual property and rely on the patent, trademark and other laws of the U.S. and
other countries. However, we may be unable to prevent third parties from using our intellectual property without our authorization. In
addition, the laws of some non-U.S. jurisdictions, particularly those of certain emerging markets, provide less protection for our
proprietary rights than the laws of the U.S. and present greater risks of counterfeiting and other infringement. To the extent we cannot
protect our intellectual property, unauthorized use and misuse of our intellectual property could harm our competitive position and
have a material adverse effect on our financial condition, liquidity or results of operations.

We are subject to risks associated with our international operations in Canada and Latin America. Legislative, political, regulatory
and economic volatility, as well as vulnerability to infrastructure and labor disruptions, could have an adverse effect on our
financial condition, liquidity or results of operations.

A portion of our products move in international trade. Our international trade is subject to currency exchange fluctuations, trade
regulations, import duties, logistics costs, delays and other related risks. Our international operations are also subject to various tax
rates, credit risks in emerging markets, political risks, uncertain legal systems, and loss of sales to local competitors following
currency devaluations in countries where we import products for sale. In addition, our international growth strategy depends, in part,
on our ability to expand our operations in Canada and Latin America. However, some emerging markets have greater political and
economic volatility and greater vulnerability to infrastructure and labor disruptions than established markets. Similarly, our efforts to
enhance the profitability or accelerate the growth of our operations in certain markets depends largely on the economic and
geopolitical conditions in those local or regional markets.

15

In addition, in many countries outside of the United States, particularly in those with developing economies, it may be common for
others to engage in business practices prohibited by laws and regulations applicable to us, such as the Foreign Corrupt Practices Act or
similar local anti-corruption or anti-bribery laws. These laws generally prohibit companies and their employees, contractors or agents
from making improper payments to government officials for the purpose of obtaining or retaining business. Failure to comply with
these laws, as well as U.S. and foreign export and trading laws, could subject us to civil and criminal penalties. As we continue to
expand our business, we may have difficulty anticipating and effectively managing these and other risks that our operations may face,
which may adversely affect our business outside the United States and our financial condition, liquidity or results of operations.

Risks Related to General Economic and Other Factors

Unstable market and economic conditions could have an adverse impact on our financial condition, liquidity or results of
operations.

Our business is influenced by market and economic conditions, including inflation, deflation, interest rates, availability and cost of
capital, consumer spending rates, energy availability and the effects of governmental initiatives to manage economic conditions.
Volatility in financial markets and the continued softness or further deterioration of national and global economic conditions could
have a material adverse effect on our financial condition, liquidity or results of operations, including as follows:

•

•

•

•

the financial stability of our customers or suppliers may be compromised, which could result in additional bad debts for us
or non-performance by suppliers;

commercial and residential consumers of our products may postpone spending in response to tighter credit, negative
financial news and/or stagnation or further declines in income or asset values, which could have a material adverse impact
on the demand for our products;

the value of investments underlying our defined benefit pension plan may decline, which could result in negative plan
investment performance and additional charges which may involve significant cash contributions to the plan, to meet
obligations or regulatory requirements; and

our asset impairment assessments and underlying valuation assumptions may change, which could result from changes to
estimates of future sales and cash flows that may lead to substantial impairment charges.

Continued or sustained deterioration of economic conditions would likely exacerbate and prolong these adverse effects.

Our business is dependent on commercial construction activity in North America. Downturns in construction activity could have
an adverse effect on our financial condition, liquidity or results of operations.

Our business has greater sales opportunities when construction activity is strong and, conversely, have fewer opportunities when such
activity declines. The cyclical nature of commercial and residential construction activity, including construction activity funded by
the public sector, tends to be influenced by prevailing economic conditions, including the rate of growth in gross domestic product,
prevailing interest rates, government spending patterns, business, investor and consumer confidence and other factors beyond our
control. Prolonged downturns in construction activity could have a material adverse effect on our financial condition, liquidity or
results of operations.

Our markets are highly competitive. Competition could reduce demand for our products or negatively affect our sales mix or price
realization. Failure to compete effectively by meeting consumer preferences, developing and marketing innovative solutions,
maintaining strong customer service and distribution relationships, and expanding our solutions capabilities and reach could
adversely affect our results.

Our customers consider product performance, product styling, customer service and price when deciding whether to purchase our
products. Shifting consumer preference in our highly competitive markets, from acoustical solutions to other ceiling and wall
products, for example, whether for performance or styling preferences or our inability to develop and offer new competitive
performance features could have an adverse effect on our sales. Similarly, our ability to identify, protect and market new and
innovative solutions is critical to our long-term growth strategy, namely to sell into more spaces and sell more solutions in every
space. If our competitors offer discounts on certain products or provide new or alternative offerings that the marketplace perceives as
more cost-effective, it could adversely affect our price realization. Any broad-based change to our price realization could materially
impact our financial condition, liquidity or results of operations.

16

Customer consolidation, and competitive, economic and other pressures facing our customers, and our potential failure to attract
new customers in our markets, may negatively impact our operating margins and profitability.

A number of our customers, including distributors and contractors, have consolidated in recent years and consolidation could continue.
Further consolidation could impact margin growth and profitability as larger customers may realize certain operational and other
benefits of scale. The economic and competitive landscape for our customers is constantly changing, and our customers' responses to
those changes could impact our business. These factors could have a material adverse impact on our business, financial condition or
results of operations.

The geographic concentration of our business could subject us to greater risk than our competitors and could have an adverse
effect on our financial condition, liquidity or results of operations.

As a result of the divestiture of our Europe, Middle East and Africa (including Russia) and Pacific Rim businesses to Knauf
International GmbH, we primarily operate in the United States, Canada and Latin America. Our concentrated operations in the
Americas could subject us to a greater degree of risk relative to our global, diversified competitors. We are particularly vulnerable to
adverse events (including acts of terrorism, natural disasters, weather conditions, labor market disruptions and government actions)
and economic conditions in the United States, Canada and Latin America. Adverse events or conditions in these geographic areas
could have a material adverse effect on our financial condition, liquidity or results of operations.

Our operating and information systems may experience a failure, a compromise of security, or a violation of data privacy laws or
regulations, which could interrupt or damage our operations.

In the conduct of our business, we collect, use, transmit and store data on information systems, which are vulnerable to disruption and
an increasing threat of continually evolving cybersecurity risks. These information systems may be disrupted or fail as a result of
events that are wholly or partially beyond our control, including events such as natural disasters, power loss, software “bugs”,
hardware defects, hacking, computer viruses, malware, ransomware or other cyber-attacks. All of these risks are also applicable where
we rely on outside vendors to provide services, which may operate in a cloud environment. We are dependent on third-party vendors
to operate secure and reliable systems which may include data transfers over the internet. Any events which deny us use of vital
operating or information systems may seriously disrupt our normal business operations.

We also compete through our use of information technology. We strive to provide customers with timely, accurate, easy-to-access
information about product availability, orders and delivery status using state-of-the-art systems. While we have processes for short-
term failures and disaster recovery capability, a prolonged disruption of systems or other failure to meet customers’ expectations
regarding the capabilities and reliability of our systems may have a material adverse effect on our operating results.

We could also experience a disruption of service or a compromise of our information security due to technical system flaws, clerical,
data input or record-keeping errors, migration to new systems, or tampering or manipulation of our systems by employees or
unauthorized third parties. Information security risks also exist with respect to the use of portable electronic devices, such as laptops
and smartphones, which are particularly vulnerable to loss and theft. Any security breach or compromise of our information systems
could significantly damage our reputation, cause the disclosure of confidential customer, employee, supplier or company information,
including our intellectual property, and result in significant losses, litigation, fines and costs. The security measures we have
implemented to protect against unauthorized access to our information systems and data may not be sufficient to prevent breaches.
The regulatory environment related to information security, data collection and privacy is evolving, with new and constantly changing
requirements applicable to our business, and compliance with those requirements could result in additional costs.

Additionally, our key partners, distributors or suppliers could experience a compromise of their information security due to technical
system flaws, clerical, data input or record-keeping errors, or tampering or manipulation of their respective systems by employees or
third parties, which may have an impact on our commercial sales, vendor, partner or other relationships.

We cannot provide any guarantee of future cash dividend payments or that we will be able to repurchase our common stock
pursuant to a share repurchase program.

Since December 2018, our Board of Directors has declared a quarterly dividend on our common stock. The payment of any future
cash dividends to our shareholders is not guaranteed and will depend on decisions that will be made by our Board of Directors based
upon our financial condition, results of operations, business requirements and a determination that the declaration of cash dividends is
in the best interest of our shareholders and is in compliance with all laws and agreements applicable to the payment of dividends.

Since July 2016, our Board of Directors has approved share repurchases up to a total of $1,200.0 million. Repurchases under the
program may be made through open market, block and privately-negotiated transactions, including Rule 10b5-1 plans, at times and in

17

amounts as management deems appropriate, subject to market and business conditions, regulatory requirements and other factors. The
program does not obligate the company to repurchase any particular amount of common stock and may be suspended or discontinued
at any time without notice. Furthermore, there can be no assurance that we will be able to repurchase our common stock and we may
discontinue plans to repurchase common stock at any time.

Public health epidemics or pandemics, such as the COVID-19 outbreak, could have an adverse effect on our financial condition,
liquidity or results of operations.

The COVID-19 outbreak has created significant volatility, uncertainty and economic disruption. The extent to which COVID-19, or
other public health epidemics, impacts our employees, operations, customers, suppliers and financial results will depend on numerous
evolving factors that we may not be able to accurately predict, including: the duration and scope of the pandemic (and whether there is
a resurgence or multiple resurgences in the future); government actions taken in response to the pandemic; the availability and
distribution of vaccinations; the impact on construction activity; the effect on our customers demand for our ceiling and wall systems;
our ability to manufacture and sell our products; and the ability of our customers to pay for our products. For example, while many of
our products support life sustaining activities and essential construction, we, and certain of our customers or suppliers, may be
impacted by state actions, orders and policies regarding the COVID-19 pandemic, including temporary closures of non-life sustaining
businesses, shelter-in-place orders, and travel, social distancing and quarantine policies, the implementation and enforcement of which
vary by individual U.S. states and by individual countries in the Americas. Any of these events could have material adverse effect on
our financial condition, liquidity or results of operations.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2.

PROPERTIES

We own a 100-acre, multi-building campus in Lancaster, Pennsylvania comprising the site of our corporate headquarters and most of
our non-manufacturing operations.

As of December 31, 2020, we had 16 manufacturing plants in two countries, with 14 plants located throughout the U.S., which
included our St. Helens, Oregon mineral fiber manufacturing facility, which closed in the second quarter of 2018. We have two plants
in Canada. During 2020, as part of our acquisition of Turf, we acquired a plant in Illinois and, as part of our acquisitions of Moz and
Arktura, we acquired two additional plants in California. During 2020, we sold our idled plant in China, which had been classified as
an asset held for sale.

WAVE operates six additional plants in the U.S. to produce suspension system (grid) products, which we use and sell in our ceiling
systems.

Eight of our plants are leased and the remaining eight are owned.

Operating Segment

Number
of
Plants

Location of Principal Facilities

Mineral Fiber
Architectural Specialties

6
10

U.S. (Florida, Georgia, Ohio, Oregon, Pennsylvania and West Virginia)
U.S. (California, Illinois, Missouri and Ohio), Canada (Quebec and Ontario)

Sales and administrative offices are leased and/or owned, and leased facilities are utilized to supplement our owned warehousing
facilities.

Production capacity and the extent of utilization of our facilities are difficult to quantify with certainty. In any one facility, utilization
of our capacity varies periodically depending upon demand for the product that is being manufactured. We believe our facilities are
adequate and suitable to support the business. Additional incremental investments in plant facilities are made as appropriate to
balance capacity with anticipated demand, improve quality and service, and reduce costs.

ITEM 3. LEGAL PROCEEDINGS

See the “Specific Material Events” section of the “Environmental Matters” section of Note 27 to the Consolidated Financial
Statements, which is incorporated herein by reference, for a description of our significant legal proceedings.

18

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

19

PART II

ITEM 5. MARKET FOR THE REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND

ISSUER PURCHASES OF EQUITY SECURITIES

AWI’s common shares trade on the New York Stock Exchange under the ticker symbol “AWI.” As of February 17, 2021, there were
217 holders of record of AWI’s common stock.

Dividends are payable when declared by our Board of Directors and in accordance with restrictions set forth in our debt agreements.
In general, our debt agreements allow us to make “restricted payments,” which include dividends and stock repurchases, subject to
certain limitations and other restrictions and provided that we are in compliance with the financial and other covenants of our debt
agreements and meet certain liquidity requirements after giving effect to the restricted payment. We declared dividends on a quarterly
basis, totaling $0.81 per share in 2020. On February 17, 2021, our Board of Directors declared a dividend of $0.21 per common share
outstanding. The dividend will be paid on March 18, 2021, to shareholders of record as of the close of business on March 4, 2021. For
further discussion of the debt agreements, see the Financial Condition and Liquidity section of Management’s Discussion and
Analysis of Financial Condition and Results of Operations in Item 7 and Risk Factors in Item 1A in this Form 10-K.

Issuer Purchases of Equity Securities

Period
October 1 – 31, 2020
November 1 – 30, 2020
December 1 – 31, 2020
Total

Total Number
of Shares
Purchased (1)
645
30,000
96,907
127,552

Average Price
Paid per Share
60.51
$
78.57
$
79.18
$

Total Number of
Shares Purchased
as Part of Publicly
Announced Plans
or Programs

-
30,000
96,523
126,523

Maximum
Approximate Value
of Shares that may
yet be Purchased
under the Plans or
Programs
603,779,225
601,422,060
593,779,245

$
$
$

(1)

Includes shares reacquired through the withholding of shares to pay employee tax obligations upon the exercise of options or vesting of restricted shares
previously granted under our long term incentive plans. For more information regarding securities authorized for issuance under our equity compensation
plans, see Note 22 to the Consolidated Financial Statements included in this Form 10-K.

Since July 29, 2016, our Board of Directors has approved our share repurchase program pursuant to which we are currently authorized
to repurchase up to $1,200.0 million of our outstanding shares of common stock through December 31, 2023 (the “Program”). The
Program was temporarily suspended in the first quarter of 2020 in response to uncertainties surrounding COVID-19. On October 21,
2020, we elected to restart the Program and had $593.8 million remaining under the Board’s repurchase authorization as of December
31, 2020.

Repurchases under the Program may be made through open market, block and privately-negotiated transactions, including Rule 10b5-
1 plans, at such times and in such amounts as management deems appropriate, subject to market and business conditions, regulatory
requirements and other factors. The Program does not obligate AWI to repurchase any particular amount of common stock and may
be suspended or discontinued at any time without notice.

During 2020, we repurchased 0.5 million shares under the Program for a cost of $44.4 million, excluding commissions, or an average
price of $87.27 per share. Since inception, we have repurchased 9.7 million shares under the Program for a cost of $606.2 million,
excluding commissions, or an average price of $62.35 per share.

20

ITEM 6.

SELECTED FINANCIAL DATA

In January 2021, the SEC adopted rule amendments to Item 302(a) of Regulation S-K which eliminates the requirement for registrants
to furnish selected financial data in comparative tabular form for each of the last five fiscal years. The rule amendments became
effective on February 10, 2021 and compliance is required beginning with the fiscal year ending on or after August 9, 2021. Early
adoption in filings made after February 10, 2021 is permitted and we have elected to early adopt this amendment.

21

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF

OPERATIONS

Armstrong World Industries, Inc. (“AWI”) is a Pennsylvania corporation incorporated in 1891.

This discussion should be read in conjunction with the financial statements, the accompanying notes, the cautionary note regarding
forward-looking statements and risk factors included in this Form 10-K.

Overview

We are a leading producer of ceiling systems for use in the construction and renovation of commercial and residential buildings. We
design, manufacture and sell ceiling and wall systems (primarily mineral fiber, fiberglass wool, metal, wood, wood fiber, glass-
reinforced-gypsum and felt) throughout the Americas.

COVID-19

The impact of the COVID-19 outbreak on our future consolidated results of operations is uncertain. We experienced a significant
decrease in customer demand within both segments during the second through fourth quarters of 2020 due to COVID-19. Specifically,
we noted delays in construction driven by temporary closures of non-life sustaining businesses, with the most significant impacts in
major metropolitan areas impacted by COVID-19. We experienced less of a comparative decline in net sales during the third and
fourth quarters of 2020 compared to the second quarter of 2020, as construction resumed across many parts of the U.S. In response to
COVID-19, we reduced capital expenditures and discretionary spending including compensation, travel and marketing expenses.

As of December 31, 2020, all of our manufacturing facilities were operational, excluding the St. Helens, Oregon facility which was
idled prior to the COVID-19 outbreak. In an effort to operate safely and responsibly, we continue to follow guidelines from
governmental and local health authorities across all our facilities and have implemented preventative measures that include working
remotely, providing personal protective equipment, limiting group meetings, enhancing cleaning and sanitizing procedures, and social
distancing.

During the first quarter of 2020, we borrowed an additional $100.0 million from our revolving credit facility and $30.0 million from
our accounts receivable securitization facility. During the second quarter of 2020, we repaid $65.0 million of the revolving credit
facility borrowings and during the third quarter of 2020 we repaid $30.0 million in connection with the maturity of our accounts
receivable securitization facility. Our share repurchase program was temporarily suspended in the first quarter of 2020 in response to
uncertainties surrounding COVID-19. On October 21, 2020, we elected to restart the program and had $593.8 million remaining under
our Board of Director’s repurchase authorization as of December 31, 2020. We did not record any asset impairments, inventory
charges or material bad debt reserves related to COVID-19 during 2020 but future events may require such charges. We will continue
to evaluate the nature and extent of the COVID-19 outbreak’s impact on our financial condition, results of operations and cash flows.

Acquisitions

In December 2020, we acquired all of the issued and outstanding equity of Arktura LLC (“Arktura”) and certain subsidiaries with
operations in the United States and Argentina. Arktura is a designer and fabricator of metal and felt ceilings, walls, partitions and
facades with one manufacturing facility based in Los Angeles, California.

In August 2020, we acquired the business and assets of Moz Designs, Inc. (“Moz”), based in Oakland, California. Moz is a designer
and fabricator of custom architectural metal ceilings, walls, dividers and column covers for interior and exterior applications with one
manufacturing facility.

In July 2020, we acquired all of the issued and outstanding capital stock of TURF Design, Inc. (“Turf”), with one manufacturing
facility in Elgin, Illinois and a design center in Chicago, Illinois. Turf is a designer and manufacturer of acoustic felt ceilings and wall
products.

In November 2019, we acquired the business and assets of MRK Industries, Inc. (“MRK”), based in Libertyville, Illinois. MRK is a
manufacturer of specialty metal ceiling, wall and exterior solutions with one manufacturing facility.

In March 2019, we acquired the business and assets of Architectural Components Group, Inc. (“ACGI”), based in Marshfield,
Missouri. ACGI is a manufacturer of custom wood ceilings and walls with one manufacturing facility.

22

In August 2018, we acquired the business and assets of Steel Ceilings, Inc. (“Steel Ceilings”), based in Johnstown, Ohio. Steel
Ceilings is a manufacturer of aluminum and stainless metal ceilings that include architectural, radiant and security solutions with one
manufacturing facility.

In May 2018, we acquired the business and assets of Plasterform, Inc. (“Plasterform”), based in Mississauga, Ontario, Canada.
Plasterform is a manufacturer of architectural cast ceilings, walls, facades, columns and moldings with one manufacturing facility.

The operations, assets and liabilities of these acquisitions are included in our Architectural Specialties segment.

Discontinued Operations

On September 30, 2019, we completed the sale of certain subsidiaries comprising our businesses and operations in Europe, the Middle
East and Africa (including Russia) (“EMEA”) and the Pacific Rim, including the corresponding businesses and operations conducted
by Worthington Armstrong Venture (“WAVE”), our joint venture with Worthington Industries, Inc. (“Worthington”) in which AWI
holds a 50% interest (collectively, the “Sale”), to Knauf International GmbH (“Knauf”). The purchase price of $330.0 million was
previously paid by Knauf to us during 2018 and was subject to certain post-closing adjustments for cash and debt as provided in the
Purchase Agreement dated as of November 17, 2017, by and between us and Knauf (the “Purchase Agreement”), including
adjustments based on the economic impact of any required regulatory remedies and a working capital adjustment. During 2020, we
remitted $25.9 million, respectively, to WAVE for their remaining portion of the proceeds from Knauf. Also during 2020, WAVE
paid each of AWI and Worthington dividends of $13.0 million relating to these payments. During the third quarter of 2020, we
remitted $6.4 million to Knauf for working capital and other adjustments. In January 2021, we finalized the post-closing adjustments
to purchase price related to certain pension liabilities assumed by Knauf in the Sale. During the fourth quarter of 2020, we recorded a
$12.0 million loss primarily related to this purchase price adjustment, which is reflected within accounts payable and accrued expenses
as of December 31, 2020.

In 2019, we entered into a Transition Services Agreement with Knauf for its benefit and the benefit of a buyer of certain businesses
divested by Knauf, pursuant to which we provided certain transition technology, finance and information technology support services.
The Transition Services Agreement expired in 2020. In connection with the closing of the Sale, we also entered into (i) a royalty-free
intellectual property License Agreement with Knauf under which they, and the buyers of certain businesses divested by Knauf, license
patents, trademarks and know-how from us for use in licensed territories in which the business was conducted prior to the Sale, and
(ii) a Supply Agreement with Knauf under which the parties may continue to purchase certain products from each other following the
closing of the Sale. WAVE also entered into similar agreements with Knauf for such purposes. The term of the granted licenses, with
respect to each intellectual property right, extend until the expiration or abandonment of each such intellectual property right.

The EMEA and Pacific Rim segment historical financial results through September 30, 2019 have been reflected in AWI’s
Consolidated Statements of Operations and Comprehensive Income as discontinued operations for all periods presented, while the
assets and liabilities of discontinued operations have been removed from AWI’s Consolidated Balance Sheet as of December 31,
2019.

See Notes 5 and 6 to the Consolidated Financial Statements for additional information related to our acquisitions and discontinued
operations.

Manufacturing Plants

As of December 31, 2020, we had 16 manufacturing plants in two countries, with 14 plants located within the U.S., which included
our St. Helens, Oregon mineral fiber manufacturing facility, which closed in the second quarter of 2018. We have two plants in
Canada. During 2020, as part of our acquisition of Turf, we acquired a plant in Illinois and, as part of acquisitions of Moz and Arktura,
we acquired two additional plants in California. During 2020, we sold our idled plant in China, which had been classified as an asset
held for sale.

WAVE operates six additional plants in the U.S. to produce suspension system (grid) products, which we use and sell in our ceiling
systems.

Reportable Segments

Our operating segments are as follows: Mineral Fiber, Architectural Specialties and Unallocated Corporate.

Mineral Fiber – produces suspended mineral fiber and soft fiber ceiling systems for use in commercial and residential settings.
Products offer various performance attributes such as acoustical control, rated fire protection, aesthetic appeal and health attributes.
Commercial ceiling products are sold to resale distributors and to ceiling systems contractors. Residential ceiling products are sold

23

primarily to wholesalers and retailers (including large home centers). The Mineral Fiber segment also includes the results of WAVE,
which manufactures and sells suspension system (grid) products and ceiling component products that are invoiced by both AWI and
WAVE. Segment results relating to WAVE consist primarily of equity earnings and reflect our 50% equity interest in the joint
venture. Ceiling component products consist of ceiling perimeters and trim, in addition to grid products that support drywall ceiling
systems. To a lesser extent, however, in some geographies and for some customers, WAVE sells its suspension systems products to
AWI for resale to customers. Mineral Fiber segment results reflect those sales transactions. The Mineral Fiber segment also includes
all assets and liabilities not specifically allocated to our Architectural Specialties or Unallocated Corporate segment, including all
property and related depreciation associated with our Lancaster, PA headquarters. Operating results for the Mineral Fiber segment
include a significant majority of allocated Corporate administrative expenses that represent a reasonable allocation of general services
to support its operations.

Architectural Specialties – produces and sources ceilings and walls for use in commercial settings. Products are available in numerous
materials, such as metal and wood, in addition to various colors, shapes and designs. Products offer various performance attributes
such as acoustical control, rated fire protection and aesthetic appeal. We sell standard and customized products, and a portion of our
Architectural Specialties revenues are derived from sourced products. Architectural Specialties products are sold primarily to resale
distributors and ceiling systems contractors. The majority of revenues are project driven, which can lead to more volatile sales
patterns due to project scheduling uncertainty. Operating results for the Architectural Specialties segment include a portion of
allocated Corporate administrative expenses that represent a reasonable allocation of general services to support its operations.

Unallocated Corporate – includes assets, liabilities, income and expenses that have not been allocated to our other business segments
and consists of: cash and cash equivalents, the net funded status of our U.S. Retirement Income Plan (“RIP”), the estimated fair value
of interest rate swap contracts, outstanding borrowings under our senior credit facility and income tax balances. Our Unallocated
Corporate segment also includes all assets, liabilities, income and expenses formerly reported in our EMEA and Pacific Rim segments
that were not included in the Sale.

Factors Affecting Revenues

For information on our segments’ 2020 net sales by geography, see Note 3 to the Consolidated Financial Statements included in this
Form 10-K. For information on our segments’ 2020 net sales disaggregated by major customer groups, see Note 4 to the Consolidated
Financial Statements included in this Form 10-K.

Markets. We compete in the commercial and residential construction markets. We closely monitor publicly available macroeconomic
trends that provide insight into commercial and residential market activity, including GDP, office vacancy rates, the Architecture
Billings Index, new commercial construction starts, state and local government spending, corporate profits and retail sales.

We noted several factors and trends within our markets that directly affected our business performance during 2020, most importantly
the aforementioned decrease in demand within both segments as a result of COVID-19. During 2020, we experienced an $87 million
reduction in volumes compared to 2019. Revenues for our Architectural Specialties segment were also positively impacted by our
2019 acquisitions of ACGI and MRK (collectively, the “2019 Acquisitions”) and our 2020 acquisitions of Turf, Moz and Arktura
(collectively, the “2020 Acquisitions”). The following table presents the impact of the 2019 Acquisitions and the 2020 Acquisitions
on our Architectural Specialties segment’s net sales (dollar amounts in millions):

2019 Acquisitions
2020 Acquisitions
Total

2020

2019

$

$

29.6
18.2
47.8

$

$

25.0
-
25.0

Average Unit Value. We periodically modify sales prices of our products due to changes in costs for raw materials and energy, market
conditions and the competitive environment. In certain cases, realized price increases are less than the announced price increases
because of project pricing, competitive reactions and changing market conditions. We also offer a wide assortment of products that are
differentiated by style, design and performance attributes. Pricing and margins for products within the assortment vary. In addition,
changes in the relative quantity of products purchased at different price points can impact year-to-year comparisons of net sales and
operating income. Within our Mineral Fiber segment, we focus on improving sales dollars per unit sold, or average unit value
(“AUV”), as a measure that accounts for the varying assortment of products impacting our revenues. We estimate that unfavorable
AUV decreased our total consolidated net sales for 2020 by approximately $14 million compared to 2019. See Results of Operations
for further information. Our Architectural Specialties segment generates revenues that are generally earned based on individual
contracts that include a mix of products, both manufactured by us and sourced from third parties that vary by project. As such, we do
not track AUV performance for this segment, but rather attribute most changes in sales to volume.

24

Seasonality. Historically, our sales tend to be stronger in the second and the third quarters of our fiscal year due to more favorable
weather conditions, customer business cycles and the timing of renovation and new construction. In comparison to the prior year, sales
were weaker in the second through fourth quarters of 2020 due to reduced demand related to COVID-19.

Factors Affecting Operating Costs

Operating Expenses. Our operating expenses are comprised of direct production costs (principally raw materials, labor and energy),
manufacturing overhead costs, freight, costs to purchase sourced products and selling, general, and administrative (“SG&A”)
expenses.

Our largest raw material expenditures are for aluminum, clays, felt, fiberglass, perlite, pigment, recycled paper, starch, steel, wood and
wood fiber. We manufacture most of the production needs for mineral wool at one of our manufacturing facilities. Natural gas and
packaging materials are also significant input costs. Fluctuations in the prices of these inputs are generally beyond our control and
have a direct impact on our financial results. In 2020, lower costs for raw materials and energy positively impacted operating income
by $3 million, compared to 2019.

2020 Acquisition-Related Expenses

In connection with the 2020 Acquisitions, we incurred certain acquisition-related expenses in 2020, summarized as follows (dollar
amounts in millions):

Deferred revenue
Change in fair value of contingent consideration
Deferred cash and restricted stock expenses
Backlog
Inventory

$

$

2020

Acquisition
0.7 Moz and Turf
0.1 Moz and Turf
Arktura
0.5
1.4 Moz and Turf
0.1
2.8

Turf

Affected Line Item in
the Consolidated
Statement of
Operations and
Comprehensive Income
Net sales
SG&A expenses
SG&A expenses
SG&A expenses
Cost of goods sold

The deferred revenue, backlog and inventory amounts reflect the post-acquisition expense associated with recording these liabilities
and assets at fair value as part of purchase accounting. The estimated fair value of contingent consideration for Moz and Turf is
remeasured at each reporting period. Expenses related to the deferred cash and restricted stock awards for Arktura’s former owners
and employees will be recorded over their respective service and vesting periods, as such payments are subject to the awardees’
continued employment with AWI. Purchase accounting expenses related to depreciation of fixed asset fair value adjustments and
certain intangible asset amortization expenses have been excluded from the table above. See Note 5 to the Consolidated Financial
Statements for further information.

RESULTS OF OPERATIONS

This section of this Form 10-K generally discusses 2020 and 2019 items and year-to-year comparisons between 2020 and 2019.
Discussions of year-to-year comparisons between 2019 and 2018 that are not included in this Form 10-K can be found in
Management’s Discussion and Analysis of Financial Condition and Results of Operations in Item 7 of our Amendment No. 1 to our
Annual Report on Form 10-K for the year ended December 31, 2019.

Unless otherwise indicated, net sales in these results of operations are reported based upon the AWI location where the sale was made.
Please refer to Notes 3 and 6 to the Consolidated Financial Statements for a reconciliation of segment operating income to
consolidated earnings from continuing operations before income taxes and additional financial information related to discontinued
operations.

25

2020 COMPARED TO 2019
CONSOLIDATED RESULTS FROM CONTINUING OPERATIONS
(dollar amounts in millions)

Total consolidated net sales
Operating income

2020

$
$

936.9
254.8

$
$

2019

1,038.1
317.4

Change is
Unfavorable

(9.7)%
(19.7)%

Consolidated net sales decreased 9.7% due to lower volumes of $87 million and unfavorable AUV of $14 million. Mineral Fiber net
sales decreased by $100 million and Architectural Specialties net sales decreased by $1 million. As previously noted, decreases in
volumes for both our Mineral Fiber and Architectural Specialties segments were a result of lower market demand due to COVID-19,
partially offset by the impact of our 2020 Acquisitions and 2019 Acquisitions in the Architectural Specialties segment. We
experienced less of a comparative decline in net sales during the third and fourth quarters of 2020 compared to the second quarter of
2020, with sequential improvement in each quarter.

Cost of goods sold was 64.4% of net sales in 2020, compared to 61.9% in 2019. The increase in cost of goods sold as a percent of net
sales in comparison to 2019 was primarily due to unfavorable AUV and the impact of the 2020 Acquisitions and 2019 Acquisitions,
partially offset by improved manufacturing productivity and cost reduction actions. The unfavorable AUV was partially driven by
lower mix due to regional weakness in major metropolitan areas and due to changes in sales by customer group, both of which were
impacted by COVID-19.

SG&A expenses in 2020 were $163.3 million, or 17.4% of net sales, compared to $174.3 million, or 16.8% of net sales, in 2019. The
decrease in SG&A expenses was due to a $20 million decrease in legal and professional fees, driven by expenses and attorney’s fees
incurred in the first quarter of 2019 under a settlement agreement with Roxul, USA, Inc. (“Rockfon”), a $7 million reduction related to
higher environmental insurance settlements, net of charges, a $6 million reduction in incentive-based compensation expenses and a $5
million reduction in travel expense. These decreases in SG&A expenses were partially offset by a $10 million charitable endowment
level funding to the Armstrong Foundation, a $9 million increase in SG&A expenses due to the impact of the 2020 Acquisitions and
2019 Acquisitions, including intangible asset amortization, and a $9 million increase in business development costs and investments in
digitally enabled systems and tools.

The gain related to the sale of fixed and intangible assets was due to the sale of our idled mineral fiber plant in China, which was
reported with our Unallocated Corporate segment.

Equity earnings from our WAVE joint venture were $64.0 million in 2020, compared to $96.6 million in 2019. Consistent with our
results, demand for WAVE’s products were significantly impacted by COVID-19. The decrease in WAVE earnings was primarily
related to lower volumes and unfavorable AUV and an increase in selling and administrative charges from AWI and Worthington
Industries, Inc., partially offset by lower steel costs. Also contributing to the decrease in equity earnings was a $21 million increase in
WAVE equity earnings in the third quarter of 2019, representing our 50% share of WAVE’s gain on sale of its discontinued European
and Pacific Rim businesses, net of a $4 million write-off related to our WAVE fresh-start reporting for customer relationships and
developed technology intangible assets. See Note 11 to the Consolidated Financial Statements for further information.

Interest expense was $24.1 million in 2020, compared to $38.4 million in 2019. The decrease in interest expense was primarily due to
lower borrowings and decreases in LIBOR. Also impacting the decrease in interest expense was a lower spread on our borrowings and
the write-off of unamortized debt financing cost in 2019, both of which were a result of the refinancing of our credit facility on
September 30, 2019.

Other non-operating expense, net, was $357.4 million in 2020, compared to $20.4 million of income in 2019. The increase in expense
was primarily related to the $374.4 million settlement loss and the $2.0 million special termination benefit charge, both related to our
RIP. See Note 18 to the Consolidated Financial Statements for further information.

Income tax benefit was $42.6 million in 2020, compared to $57.1 million of income tax expense in 2019, primarily driven by the
effects of our first quarter 2020 pension settlement. The effective tax rate for 2020 was 33.6% as compared to a rate of 19.1% for
2019. In comparison to the statutory rate, the effective tax rate for 2020 was most significantly increased by the pre-tax benefits
recognized on the sale of our mineral fiber plant in China. In comparison to the statutory rate, the effective tax rate for 2019 was most
significantly impacted by the benefits related to WAVE’s gain on sale of its EMEA and Pacific Rim businesses and statute closures.

Total other comprehensive income (“OCI”) was $266.8 million in 2020, compared to $83.4 million in 2019. The change in OCI was
primarily driven by pension and postretirement adjustments, primarily a $278.6 million settlement loss, net of taxes, related to our

26

RIP, partially offset by $6.9 million of foreign currency translation adjustments that were reclassified out of accumulated other
comprehensive income (“AOCI”) upon the sale of our idled mineral fiber plant in China and the absence of $80.2 million of foreign
currency translation adjustments that were reclassified out of AOCI concurrent with the Sale in third quarter of 2019. Pension and
postretirement adjustments represent the amortization of actuarial gains and losses related to our defined benefit pension and
postretirement plans. Foreign currency translation adjustments represent the change in the U.S. dollar value of assets and liabilities
denominated in foreign currencies. Also impacting the change in OCI in both periods were derivative gains/losses. Derivative
gain/loss represents the mark-to-market value adjustments of our derivative assets and liabilities and the recognition of gains and
losses previously deferred in OCI.

REPORTABLE SEGMENT RESULTS
Mineral Fiber
(dollar amounts in millions)

Total segment net sales
Operating income

2020

2019

$
$

726.0
218.7

$
$

826.6
289.6

Change is
Unfavorable

(12.2)%
(24.5)%

Net sales decreased due to lower volumes of $89 million and unfavorable AUV of $12 million. The decreases in volumes were driven
by a significant decrease in demand due to COVID-19. The unfavorable AUV was partially driven by lower mix due to regional
weakness in major metropolitan areas and due to changes in sales by customer group, both of which were impacted by COVID-19.

Operating income decreased primarily due to a $63 million negative impact due to lower volumes, a $33 million reduction in WAVE
equity earnings, a $22 million impact from lower AUV, a $10 million charitable endowment level funding to the Armstrong
Foundation and a $9 million increase in business development costs and investments in digitally enabled systems and tools. Partially
offsetting these decreases to operating income was a $29 million reduction in manufacturing costs, a $20 million decrease in legal and
professional fees incurred in 2019 under a settlement agreement with Rockfon, a $7 million reduction related to higher environmental
insurance settlements, net of charges, a $6 million reduction in incentive-based compensation expenses and a $4 million reduction in
travel expense.

Architectural Specialties
(dollar amounts in millions)

Total segment net sales
Operating income

2020

2019

$
$

210.9
22.3

$
$

211.5
35.9

Change is
Unfavorable

(0.3)%
(37.9)%

Net sales decreased $1 million and were negatively impacted by a reduction in demand across almost all product categories and
geographies as a result of COVID-19. Net sales in 2020 increased by $23 million due to the impact of the 2020 Acquisitions and 2019
Acquisitions.

Operating income decreased due to the impact of lower sales, excluding the impact of the 2020 Acquisitions and 2019 Acquisitions.
Also contributing to the decrease in operating income was an additional $2 million of amortization expense related to the 2020
Acquisitions and the 2019 Acquisitions.

Unallocated Corporate

Unallocated Corporate operating income was $14 million in 2020 compared to $8 million of operating loss in 2019. The increase in
operating income was primarily due to the $21 million gain related to the sale of our idled mineral fiber plant in China. See Note 3 to
the Consolidated Financial Statements for further information.

FINANCIAL CONDITION AND LIQUIDITY

Cash Flow

The discussion that follows includes cash flows related to discontinued operations in 2019, primarily operations sold in the Sale.

27

Operating activities for 2020 provided $218.8 million of cash, compared to $182.7 million in 2019. The increase was primarily due to
lower tax payments and positive working capital changes, primarily receivables and accounts payable, partially offset by lower cash
earnings.

Net cash used for investing activities was $141.1 million for 2020, compared to $89.1 million in 2019. The increase was primarily
due to higher cash paid for acquisitions and the remittance of the remaining portion of Knauf proceeds to WAVE in 2020, partially
offset by lower payments to Knauf, proceeds from the sale of our idled mineral fiber plant in China in 2020 and lower purchases of
property, plant and equipment.

Net cash provided by financing activities was $13.5 million in 2020, compared to $384.9 million of cash used in 2019. The favorable
change of cash was primarily due to decreased debt payments as a result of our September 2019 debt refinancing and lower
repurchases of outstanding common stock.

Liquidity

Our liquidity needs for operations vary throughout the year. We retain lines of credit to facilitate our seasonal cash flow needs, since
cash flow is generally lower during the first and fourth quarters of our fiscal year.

We have a $1,000.0 million variable rate senior credit facility, which is composed of a $500.0 million revolving credit facility (with a
$150.0 million sublimit for letters of credit) and a $500.0 million Term Loan A. The revolving credit facility and Term Loan A are
currently priced at 1.50% over LIBOR. The senior credit facility also has a $25.0 million letter of credit facility, also known as our bi-
lateral facility. The revolving credit facility and Term Loan A mature in September 2024. The $1,000.0 million senior credit facility is
secured by the capital stock of material U.S. subsidiaries and a pledge of 65% of the stock of our material first-tier foreign subsidiary
in Canada. The unpaid balances of the revolving credit facility and Term Loan A may be prepaid without penalty at the maturity of
their respective interest reset periods. Any principal amounts paid on the Term Loan A may not be re-borrowed.

As of December 31, 2020, total borrowings outstanding under our senior credit facility were $225.0 million under the revolving credit
facility and $493.7 million under Term Loan A.

The senior credit facility includes two financial covenants that require the ratio of consolidated earnings before interest, taxes,
depreciation and amortization (“EBITDA”) to consolidated cash interest expense minus cash consolidated interest income to be
greater than or equal to 3.0 to 1.0 and requires the ratio of consolidated funded indebtedness, minus AWI and domestic subsidiary
unrestricted cash and cash equivalents up to $100 million, to EBITDA to be less than or equal to 3.75 to 1.0. As of December 31,
2020, we were in compliance with all covenants of the senior credit facility.

The Term Loan A is currently priced on a variable interest rate basis. The following table summarizes our interest rate swaps (dollar
amounts in millions):

Trade Date
November 14, 2016
November 28, 2018
November 28, 2018
March 6, 2020
March 10, 2020
March 11, 2020

$
$
$
$
$
$

Notional
Amount

200.0
200.0
100.0
50.0
50.0
50.0

Coverage Period
December 2016 to March 2021
November 2018 to November 2023
March 2021 to March 2025
March 2020 to March 2022
March 2021 to March 2024
March 2021 to March 2024

Risk Coverage
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR

Under the terms of the November 2016 swap maturing in 2021, we receive 3-month LIBOR and pay a fixed rate over the hedged
period, in addition to a basis rate swap to convert the floating rate risk under our November 2016 swap from 3-month LIBOR to 1-
month LIBOR. As a result, we receive 1-month LIBOR and pay a fixed rate over the hedged period.

Under the terms of the November 2018 swap maturing in 2023, we pay a fixed rate over the hedged amount and receive a 1-month
LIBOR. This is inclusive of a 0% floor.

Under the terms of the forward starting November 2018 swap maturing in 2025, we will pay a fixed rate monthly and receive 1-month
LIBOR. This is inclusive of a 0% floor.

Under the terms of the March 2020 swap maturing in 2022, we pay a fixed rate over the hedged amount and receive 1-month LIBOR.
This is inclusive of a 0% floor.

28

Under the terms of the forward starting March 2020 swaps maturing in 2024, we will pay a fixed rate monthly and receive 1-month
LIBOR. These are inclusive of a 0% floor.

These swaps are designated as cash flow hedges against changes in LIBOR for a portion of our variable rate debt.

As of December 31, 2020, we had $136.9 million of cash and cash equivalents, $123.7 million in the U.S and $13.2 million in various
foreign jurisdictions, primarily Canada.

During 2020, we borrowed and subsequently repaid $30.0 million under our Accounts Receivable Securitization Facility with the
Bank of Nova Scotia (the “funding entity”) which matured in September 2020. Interest on borrowings under this amended facility was
calculated at a 90-day commercial paper rate. Under this facility, we sold accounts receivables to Armstrong Receivables Company,
LLC (“ARC”), a Delaware entity that is consolidated in these financial statements. ARC is a 100% wholly owned single member
LLC special purpose entity created specifically for this transaction; therefore, any receivables sold to ARC were not available to the
general creditors of AWI. ARC used this facility to borrow cash or issue letters of credit. When ARC borrowed cash under this
facility, ARC sold an undivided percentage ownership interest in the purchased accounts receivables to the funding entity. We had the
unilateral right to repurchase the funding entity’s purchased interest in the accounts receivables and, as a result, borrowings under this
facility were reported as debt in the Consolidated Balance Sheets. Borrowings under this facility were obligations of ARC and not
AWI. ARC contracted with and paid a servicing fee to AWI to manage, collect and service the purchased accounts receivables. All
new receivables under the program were continuously purchased by ARC with the proceeds from collections of receivables previously
purchased.

We utilize lines of credit and other commercial commitments in order to ensure that adequate funds are available to meet operating
requirements. Letters of credit are currently arranged through our revolving credit facility and our bi-lateral facility. Letters of credit
may be issued to third party suppliers, insurance and financial institutions and typically can only be drawn upon in the event of AWI’s
failure to pay its obligations to the beneficiary. The following table presents details related to our letters of credit facilities (dollar
amounts in millions):

Financing Arrangements
Bi-lateral facility
Revolving credit facility
Total

Limit

December 31, 2020
Used

Available

25.0
150.0
175.0

$

$

10.9
-
10.9

$

14.1
150.0
164.1

The table below reflects future payments of long-term debt, excluding $3.2 million of unamortized debt financing costs, and the
related interest payments, which are projected based on market-based interest rate swap curves (dollar amounts in millions):

Long-term debt
Scheduled interest payments

2021

2022

2023

2024

Total

$

$

25.0
20.9

$

25.0
20.4

$

25.0
19.6

$

643.7
11.8

718.7
72.7

As of December 31, 2020, we had $136.9 million of cash and cash equivalents and $275.0 million available under our revolving credit
facility. We believe cash on hand and cash generated from operations, together with borrowing capacity under our credit facility, will
be adequate to address our near-term liquidity needs based on current expectations of our business operations, capital expenditures and
scheduled payment of debt obligations. In 2021, we expect to spend approximately $75.0 million to $80.0 million on capital
expenditures and approximately $40.0 million on dividends. The impacts of COVID-19 could create volatility in financial markets
which may impact the terms under which we access capital. We continue to evaluate reductions in discretionary spending, capital
expenditures and other costs.

CRITICAL ACCOUNTING ESTIMATES

In preparing our consolidated financial statements in accordance with U.S. generally accepted accounting principles (“GAAP”), we
are required to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the
reporting period. We evaluate our estimates and assumptions on an on-going basis, using relevant internal and external information.
We believe that our estimates and assumptions are reasonable. However, actual results may differ from what was estimated and could
have a significant impact on the financial statements.

We have identified the following as our critical accounting estimates. We have discussed these critical accounting estimates with our
Audit Committee.

29

U.S. Pension Credit and Postretirement Benefit Costs – We maintain significant pension and postretirement plans in the U.S. Our
defined benefit pension and postretirement benefit costs are developed from actuarial valuations. These valuations are calculated
using a number of assumptions, which represent management’s best estimate of the future. The assumptions that have the most
significant impact on reported results are the discount rate, the estimated long-term return on plan assets and the estimated inflation in
health care costs. These assumptions are generally updated annually.

Management utilizes the Aon Hewitt AA only above median yield curve, which is a hypothetical AA yield curve comprised of a series
of annualized individual discount rates, as the primary basis for determining discount rates. As of December 31, 2020 and 2019, we
assumed discount rates of 2.68% and 3.16%, respectively, for the U.S. defined benefit pension plans. As of December 31, 2020 and
2019, we assumed a discount rates of 2.37% and 3.14%, respectively, for the U.S. postretirement plan. The effects of the change in
discount rate will be amortized into earnings as described below. Absent any other changes, a one-quarter percentage point increase
or decrease in the discount rates for the U.S. pension and postretirement plans would not have a material impact on 2021 operating or
non-operating income.

We manage two U.S. defined benefit pension plans, our RIP, which is a qualified funded plan, and a nonqualified unfunded plan. For
the RIP, the expected long-term return on plan assets represents a long-term view of the future estimated investment return on plan
assets. This estimate is determined based on the target allocation of plan assets among asset classes and input from investment
professionals on the expected performance of the asset classes over 10 to 30 years. Historical asset returns are monitored and
considered when we develop our expected long-term return on plan assets. An incremental component is added for the expected
return from active management based on historical information obtained from the plan’s investment consultants. These forecasted
gross returns are reduced by estimated management fees and expenses. Over the 10-year period ended December 31, 2020, the
historical annualized return was approximately 7.6% compared to an average expected return of 6.1%. The actual gain on plan assets
incurred for 2020 was 9.6%, net of fees. The difference between the actual and expected rate of return on plan assets will be amortized
into earnings as described below.

The expected long-term return on plan assets used in determining our 2020 U.S. pension cost was 5.25%. We have assumed a return
on plan assets for 2021 of 3.25% as a result of a more conservative asset allocation. The 2021 expected return on assets was
calculated in a manner consistent with 2020. A one-quarter percentage point increase or decrease in this assumption would not have a
material impact on 2021 non-operating income.

Contributions to the unfunded pension plan were $3.1 million in 2020 and were made on a monthly basis to fund benefit payments.
We estimate the 2021 contributions will be approximately $2.9 million. See Note 18 to the Consolidated Financial Statements for
more information.

The estimated inflation in health care costs represents a 5-10 year view of the expected inflation in our postretirement health care
costs. We separately estimate expected health care cost increases for pre-65 retirees and post-65 retirees due to the influence of
Medicare coverage at age 65, as illustrated below:

2019
2020
2021

Assumptions

Actual

Post-65

Pre-65

Post-65

Pre-65

8.7%
8.2%
7.6%

7.6%
7.2%
6.7%

(9.7)%
3.3%

24.8%
0.7%

The difference between the actual and expected health care costs is amortized into earnings as described below. As of December 31,
2020, health care cost increases are estimated to decrease ratably until 2027, after which they are estimated to be constant at 4.50%.
See Note 18 to the Consolidated Financial Statements for more information.

Actual results that differ from our various pension and postretirement plan estimates are captured as actuarial gains/losses. When
certain thresholds are met, the gains and losses are amortized into future earnings over the remaining life expectancy of
participants. Changes in assumptions could have significant effects on earnings in future years.

Total net actuarial losses related to our U.S. pension benefit plans as of December 31, 2020 decreased by $398.1 million in 2020
primarily due to a $374.4 million settlement loss related to the transfer of certain benefit obligations of our RIP, better than expected
return on assets, an annuity premium gain in the RIP and an experience gain in the RBEP, partially offset by a 48-basis point decrease
in the discount rate. The $398.1 million actuarial gain impacting our U.S. pension plans is reflected as a component of other
comprehensive income in our Consolidated Statements of Operations and Comprehensive Income along with actuarial gains and
losses from our foreign pension plan and our U.S. postretirement benefit plan.

30

Income Taxes – Our effective tax rate is primarily determined based on our pre-tax income, statutory income tax rates in the
jurisdictions in which we operate, and the tax impacts of items treated differently for tax purposes than for financial reporting
purposes. Some of these differences are permanent, such as expenses that are not deductible in our tax returns, and some differences
are temporary, reversing over time, such as depreciation expense. These temporary differences create deferred income tax assets and
liabilities. Deferred income tax assets are also recorded for net operating losses (“NOL”), capital loss carryforwards, and foreign tax
credit (“FTC”) carryforwards.

As of December 31, 2020, we have recorded valuation allowances totaling $79.4 million for various federal and state deferred tax
assets. While we have considered future taxable income in assessing the need for the valuation allowances based on our best available
projections, if these estimates and assumptions change in the future or if actual results differ from our projections, we may be required
to adjust our valuation allowances accordingly. Such adjustments could be material to our Consolidated Financial Statements.

As further described in Note 16 to the Consolidated Financial Statements, our Consolidated Balance Sheet as of December 31, 2020
includes deferred income tax assets of $163.8 million. Included in this amount are deferred federal income tax assets for FTC
carryforwards of $17.7 million, federal and state capital loss carryforwards of $19.3 million, and state NOL deferred income tax assets
of $48.7 million. We have established valuation allowances in the amount of $79.4 million consisting of $17.7 million for federal
deferred tax assets related to FTC carryovers, $42.4 million for state deferred tax assets, primarily operating loss carryovers, and $19.3
million for federal and state deferred tax assets related to capital loss carryovers. Inherent in determining our effective tax rate are
judgments regarding business plans and expectations about future operations. These judgments include the amount and geographic
mix of future taxable income, the amount of foreign source income, limitations on usage of NOL carryforwards, the impact of ongoing
or potential tax audits, and other future tax consequences.

We estimate we will need to generate future U.S. taxable income of approximately $612.3 million for state income tax purposes
during the respective realization periods (ranging from 2021 to 2040) to be able to fully realize the net state NOL deferred income tax
assets.

Our ability to utilize deferred tax assets may be impacted by certain future events, such as changes in tax legislation and insufficient
future taxable income prior to expiration of certain deferred tax assets.

Impairments of Long-Lived Tangible, Intangible Assets and Goodwill – Our indefinite-lived assets include goodwill and other
intangibles, primarily trademarks and brand names. Those trademarks and brand names are integral to our corporate identity and
expected to contribute indefinitely to our corporate cash flows. Accordingly, they have been assigned an indefinite life. We conduct
our annual impairment tests for these indefinite-lived intangible assets and goodwill during the fourth quarter. These assets undergo
more frequent tests if an indication of possible impairment exists. We conduct impairment tests for tangible assets and definite-lived
intangible assets when indicators of impairment exist for the asset group, such as operating losses and/or negative cash flows.

The principal assumptions used in our impairment tests for definite-lived intangible assets is operating profit adjusted for depreciation
and amortization and, if required to estimate the fair value, the discount rate. The principal assumptions used in our impairment tests
for indefinite-lived intangible assets include revenue growth rates, discount rate and royalty rate. The principal assumptions utilized in
our impairment tests for goodwill include after-tax cash flows growth rates and discount rate. Revenue growth rates, after-tax cash
flows growth rates and operating profit assumptions are derived from those used in our operating plan and strategic planning
processes. The discount rate assumption is calculated based upon an estimated weighted average cost of capital which reflects the
overall level of inherent risk and the rate of return a market participant would expect to achieve. The royalty rate assumption
represents the estimated contribution of the intangible assets to the overall profits of the related businesses. Methodologies used for
valuing our intangible assets did not change from prior periods.

In 2020, indefinite-lived intangibles and goodwill were tested for impairment based on the identified asset (for indefinite-lived
intangibles) or on our identified reporting units (for goodwill). There were no impairment charges recorded in 2020, 2019 or 2018
related to intangible assets. We did not test tangible assets within our continuing operations for impairment in 2020, 2019 or 2018 as
no indicators of impairment existed.

The revenue and cash flow estimates used in applying our impairment tests are based on management’s analysis of information
available at the time of the impairment test and represent a market participant view. Actual cash flows lower than the estimate could
lead to significant future impairments. If subsequent testing indicates that fair values have declined, the carrying values would be
reduced and our future statements of operations would be affected.

We cannot predict the occurrence of certain events that might lead to material impairment charges in the future. Such events may
include, but are not limited to, the impact of economic environments, particularly related to the commercial and residential

31

construction industries, material adverse changes in relationships with significant customers, or strategic decisions made in response to
economic and competitive conditions. See Notes 3 and 13 to the Consolidated Financial Statements for further information.

Environmental Liabilities – We are actively involved in the investigation, closure and/or remediation of existing or potential
environmental contamination under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), and
state Superfund and similar environmental laws at two domestically owned locations allegedly resulting from past industrial activity.
In a few cases, we are one of several potentially responsible parties and have agreed to jointly fund the required investigation, while
preserving our defenses to the liability. We may also have rights of contribution or reimbursement from other parties or coverage
under applicable insurance policies.

We provide for environmental remediation costs and penalties when the responsibility to remediate is probable and the amount of
associated costs is reasonably determinable. Accruals are estimates based on the judgment of management related to ongoing
proceedings. Estimates of our future liability at the environmental sites are based on evaluations of currently available facts regarding
each individual site. In determining the probability of contribution, we consider the solvency of other parties, the site activities of
other parties, whether liability is being disputed, the terms of any existing agreements and experience with similar matters, and the
effect of our October 2006 Chapter 11 reorganization upon the validity of the claim.

We evaluate the measurement of recorded liabilities each reporting period based on current facts and circumstances specific to each
matter. The ultimate losses incurred upon final resolution may materially differ from the estimated liability recorded. Changes in
estimates are recorded in earnings in the period in which such changes occur.

We are unable to predict the extent to which any recoveries from other parties or coverage under insurance policies might cover our
final share of costs for these sites. Our final share of investigation and remediation costs may exceed any such recoveries, and such
amounts net of insurance recoveries may be material. However, we do not expect the total future costs to have a material adverse
effect on our liquidity or financial condition as the cash payments may be made over many years.

Business Combinations and Contingent Consideration – Acquired businesses are accounted for using the acquisition method of
accounting, which requires that the purchase price be allocated to the assets acquired and liabilities assumed at their respective fair
values. Adjustments to the fair value of assets acquired and/or liabilities assumed are amortized over the estimated useful life on a
straight-line basis and recorded as a component of operating income (expense). Any excess of the purchase price over the estimated
fair values of the assets acquired and liabilities assumed is recorded as goodwill. The estimated fair value of contingent consideration
is recorded as a liability on the balance sheet at the date of acquisition. The purchase price allocation requires us to make significant
estimates and assumptions, especially at the acquisition date, with respect to intangible assets and contingent consideration. Although
we believe the assumptions and estimates we have made are reasonable, they are based in part on historical experience and
information obtained from the management of the acquired companies. We engage independent, third-party valuation specialists to
assist in determining the fair values of acquired intangible assets and contingent consideration.

Both the Moz and Turf acquisitions in 2020 include the potential for contingent earn out payments based on the financial performance
of the acquired companies. We estimated the fair value of these contingent consideration liabilities upon acquisition and are required
to measure the liability at fair value each reporting period until the contingency is resolved, with changes in the fair value after the
acquisition date affecting earnings in the period of the estimated fair value change. See Note 5 to the Consolidated Financial
Statements for further information.

The principal assumptions used in valuing certain intangible assets and contingent consideration include future expected cash flows
from sales and acquired developed technologies, the acquired company's trade names and customer relationships as well as
assumptions about the period of time the acquired trade names and customer relationships will continue to be used in the combined
company's portfolio, the probability of meeting the future revenue and EBITDA growth targets and discount rates used to determine
the present value of estimated future cash flows.

These estimates are inherently uncertain and unpredictable, and if different estimates were used the total consideration, including the
estimated fair value of the contingent consideration, could be allocated to the acquired assets and liabilities differently from the
allocation that we have made. In addition, unanticipated events and circumstances may occur, which may affect the accuracy or
validity of such estimates, and if such events occur we may be required to record a charge against the value assigned to an acquired
asset or an increase in the amounts recorded for assumed liabilities.

ACCOUNTING PRONOUNCEMENTS EFFECTIVE IN FUTURE PERIODS

See Note 2 to the Consolidated Financial Statements for further information.

32

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk

Our primary exposure to market risk is from changes in interest rates that could impact our results of operations, cash flows and
financial condition. We use forward swap contracts to hedge these exposures. The Company utilizes derivative financial instruments
as risk management tools and not for speculative trading purposes. In addition, derivative financial instruments are entered into with a
diversified group of major financial institutions in order to manage our exposure to potential nonperformance on such instruments.
We regularly monitor developments in the capital markets.

In July 2017, the Financial Conduct Authority (the authority that regulates LIBOR) announced it intends to replace LIBOR rates with
the Secured Overnight Financing Rate ("SOFR") effective in late 2021. The Alternative Reference Rates Committee ("ARRC") has
proposed that the SOFR rate that represents best practice as the alternative to USD-LIBOR for use in derivatives and other financial
contracts that are currently indexed to USD-LIBOR. ARRC has proposed a paced market transition plan to SOFR from USD-LIBOR
and organizations are currently working on industry wide and company specific transition plans as it relates to derivatives and cash
markets exposed to USD-LIBOR. We continue to monitor the new SOFR rates and regulation related to our debt, interest rate hedging
instruments and other contracts that are indexed to USD-LIBOR. We have adopted the optional expedients and exceptions issued in
March 2020 under ASU 2020-04. See Note 2 to the Consolidated Financial Statements for further information.

Counterparty Risk

We only enter into derivative transactions with established financial institution counterparties having an investment-grade credit
rating. We monitor counterparty credit default swap levels and credit ratings on a regular basis. All of our derivative transactions
with counterparties are governed by master International Swap and Derivatives Association agreements (“ISDAs”) with netting
arrangements. These agreements can limit our exposure in situations where we have gain and loss positions outstanding with a single
counterparty. We do not post nor do we receive cash collateral with any counterparty for our derivative transactions. These ISDAs do
not have any credit contingent features; however, a default under our bank credit facility would trigger a default under these
agreements. Exposure to individual counterparties is controlled and we consider the risk of counterparty default to be negligible.

Interest Rate Sensitivity

We are subject to interest rate variability on our Term Loan A and revolving credit facility. A hypothetical increase of one-quarter
percentage point in LIBOR interest rates from December 31, 2020 levels would increase 2021 interest expense by approximately $0.7
million. We have active interest rate swaps outstanding, which fix the interest rates for a portion of our debt. These active interest rate
swaps are included in this calculation.

As of December 31, 2020, we had interest rate swaps outstanding with notional amounts of $650.0 million, of which $450.0 million
were active and $200.0 million were forward starting. We utilize interest rate swaps to minimize the fluctuations in earnings caused by
interest rate volatility. Under the terms of these swaps, we receive 1-month LIBOR and pay a fixed rate over the hedged period. The
following table summarizes our interest rate swaps as of December 31, 2020 (dollar amounts in millions):

Trade Date
November 14, 2016
November 28, 2018
November 28, 2018
March 6, 2020
March 10, 2020
March 11, 2020

$
$
$
$
$
$

Notional
Amount

200.0
200.0
100.0
50.0
50.0
50.0

Coverage Period
December 2016 to March 2021
November 2018 to November 2023
March 2021 to March 2025
March 2020 to March 2022
March 2021 to March 2024
March 2021 to March 2024

Risk Coverage
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR

These swaps are designated as cash flow hedges against changes in LIBOR for a portion of our variable rate debt. The net liability
measured at fair value was $28.9 million as of December 31, 2020.

33

The table below provides information about our long-term debt obligations as of December 31, 2020, including payment requirements
and related weighted-average interest rates by scheduled maturity dates. Weighted average variable rates are based on implied
forward rates in the yield curve and are exclusive of our interest rate swaps.

Scheduled maturity date
(dollar amounts in millions)

2021

2022

2023

2024

2025

After
2025

Total

Variable rate principal

payments

Average interest rate

$

$

25.0
1.61%

$

25.0
1.63%

25.0
1.76%

$ 643.7

$

2.06%

- $
-

- $ 718.7
-

2.02%

Variable rate principal payments reflected in the preceding table exclude $3.2 million of unamortized debt financing costs as of
December 31, 2020.

34

ITEM 8.

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

SUPPLEMENTARY DATA

Quarterly Financial Information for the Quarter Ended December 31, 2020 (Unaudited)

The following consolidated financial statements are filed as part of this Annual Report on Form 10-K:

Reports of Independent Registered Public Accounting Firm.

Consolidated Statements of Operations and Comprehensive Income for the Years Ended December 31, 2020, 2019 and 2018.

Consolidated Balance Sheets as of December 31, 2020 and 2019.

Consolidated Statements of Shareholders’ Equity for the Years Ended December 31, 2020, 2019 and 2018.

Consolidated Statements of Cash Flows for the Years Ended December 31, 2020, 2019 and 2018.

Notes to Consolidated Financial Statements.

Schedule II for the Years Ended December 31, 2020, 2019 and 2018.

35

Armstrong World Industries, Inc., and Subsidiaries
Quarterly Financial Information (unaudited)
(dollar amounts in millions, except for per share data)

Fourth Quarter 2020 Compared With Fourth Quarter 2019 – Continuing Operations

Consolidated net sales of $239 million in the fourth quarter of 2020 decreased 3.3% due to unfavorable AUV of $7 million and lower
volumes of $1 million. We experienced less of a comparative decline in the fourth quarter of 2020 compared to the third quarter of
2020.

Mineral Fiber net sales decreased 7.2% due to lower volumes of $8 million and unfavorable AUV of $6 million. Architectural
Specialties net sales increased 5.9% due to the impact of the 2020 Acquisitions, partially offset by lower volumes. Net sales in both
segments were negatively impacted by a reduction in demand as a result of COVID-19.

For the fourth quarter of 2020, cost of goods sold was 65.3% of net sales, compared to 64.1% in the fourth quarter of 2019. The
increase in cost of goods sold as a percent of net sales in comparison to 2019 was primarily due to unfavorable AUV and the impact of
the 2020 Acquisitions, partially offset by improved manufacturing productivity and cost reduction actions. The unfavorable AUV was
primarily driven by lower mix due to changes in sales by customer group, and to a lesser extent, due to regional weakness in major
metropolitan areas.

SG&A expenses for the fourth quarter of 2020 were $54.5 million, or 22.8% of net sales compared to $40.0 million, or 16.2% of net
sales, for the fourth quarter of 2019. The increase in SG&A expenses was driven primarily by a $10 million charitable endowment
level funding to the Armstrong Foundation, a $5 million increase in SG&A expenses, including intangible asset amortization, due to
the impact of the 2020 Acquisitions, a $4 million increase in business development costs and investments in digitally enabled systems
and tools, and a $3 million decrease in cost reimbursements, net of related expenses, earned under our Transaction Services
Agreement with Knauf. These increases in SG&A expenses were partially offset by an $8 million reduction in expenses related to
higher environmental insurance settlements, net of charges and a $2 million reduction in travel expense.

Equity earnings in the fourth quarter of 2020 were $15.8 million compared to $13.6 million for the fourth quarter of 2019. During the
fourth quarter of 2019 and as a result of the Sale, we recorded a $5 million decrease in WAVE equity earnings, representing our share
of WAVE’s fourth quarter of 2019 loss on sale of its discontinued European and Pacific Rim businesses. Excluding the impact of our
portion of WAVE’s fourth quarter loss on the Sale, WAVE equity earnings decreased due to unfavorable AUV and lower sales
volumes and an increase in selling and administrative charges from AWI and Worthington Industries, Inc. These decreases in WAVE
equity earnings were partially offset by lower input costs, particularly steel. See Note 11 to the Consolidated Financial Statements for
further information.

Operating income was $44.1 million in the fourth quarter of 2020 compared to $62.2 million in the fourth quarter of 2019.

Interest expense in the fourth quarter of 2020 decreased to $5.4 million compared to $6.8 million in the fourth quarter of 2019 due
primarily to a decrease in LIBOR.

Fourth quarter income tax expense was $8.3 million on pre-tax earnings of $43.1 million in 2020 compared to $8.3 million on pre-tax
earnings of $59.8 million in 2019. The effective tax rate for the fourth quarter of 2020 was higher than the same period in 2019
primarily due to the absence of discrete tax benefits related to stock compensation deductions and deferred tax benefits that were
recorded in the fourth quarter of 2019.

Basic and diluted earnings per share were both $0.72 in the fourth quarter of 2020, compared to basic earnings per share of $0.74 and
diluted earnings per share of $0.73 in the fourth quarter of 2019.

36

Management’s Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is
defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended. Our internal control over financial
reporting was designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of our
financial statements for external purposes in accordance with generally accepted accounting principles.

Because of inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of
any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in
conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the
effectiveness of our internal control over financial reporting based on the framework in Internal Control-Integrated Framework
(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Based on this evaluation and the
criteria in the COSO framework, our management concluded that our internal control over financial reporting was effective as of
December 31, 2020.

KPMG LLP, an independent registered public accounting firm, audited our internal control over financial reporting as of December
31, 2020, as stated in their report included herein.

/s/ Victor D. Grizzle

Victor D. Grizzle
Director, President and Chief Executive Officer

/s/ Brian L. MacNeal

Brian L. MacNeal
Senior Vice President and Chief Financial Officer

/s/ Stephen F. McNamara

Stephen F. McNamara
Vice President and Corporate Controller

February 23, 2021

37

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors
Armstrong World Industries, Inc.:

Opinion on Internal Control Over Financial Reporting

We have audited Armstrong World Industries, Inc. and subsidiaries’ (the Company) internal control over financial reporting as of
December 31, 2020, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of
Sponsoring Organizations of the Treadway Commission. In our opinion, the Company maintained, in all material respects, effective
internal control over financial reporting as of December 31, 2020, based on criteria established in Internal Control – Integrated
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States)
(PCAOB), the consolidated balance sheets of the Company as of December 31, 2020 and 2019, the related consolidated statements of
operations and comprehensive income, shareholders’ equity, and cash flows for each of the years in the three-year period ended
December 31, 2020, and the related notes and financial statement schedule II (collectively, the consolidated financial statements), and
our report dated February 23, 2021 expressed an unqualified opinion on those consolidated financial statements.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of
the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control
over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based
on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the
Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange
Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting,
assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control
based on the assessed risk. Our audit also included performing such other procedures as we considered necessary in the circumstances.
We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting
principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the
maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the
company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in
accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in
accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding
prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect
on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections
of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in
conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ KPMG LLP

Philadelphia, Pennsylvania
February 23, 2021

38

Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors
Armstrong World Industries, Inc.:

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Armstrong World Industries, Inc. and subsidiaries (the Company)
as of December 31, 2020 and 2019, the related consolidated statements of operations and comprehensive income, shareholders’
equity, and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes and financial
statement schedule II (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present
fairly, in all material respects, the financial position of the Company as of December 31, 2020 and 2019, and the results of its
operations and its cash flows for each of the years in the three-year period ended December 31, 2020, in conformity with U.S.
generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States)
(PCAOB), the Company’s internal control over financial reporting as of December 31, 2020, based on criteria established in Internal
Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our
report dated February 23, 2021 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial
reporting.

Change in Accounting Principle

As discussed in Note 2 to the consolidated financial statements, the Company has changed its method of accounting for leases as of
January 1, 2019 due to the adoption of Accounting Standards Codification Topic 842, Leases, and related amendments.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an
opinion on these consolidated financial statements based on our audits. We are a public accounting firm registered with the PCAOB
and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable
rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to
error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial
statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining,
on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included
evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall
presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current period audit of the consolidated financial
statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or
disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or
complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial
statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the
critical audit matters or on the accounts or disclosures to which they relate.

39

Pension and post retirement benefit obligations

As discussed in Notes 2 and 18 to the consolidated financial statements, the Company’s pension projected benefit obligations
and the fair value of plan assets for the U.S. plans were $441.7 million and $520.7 million, respectively, as of December 31,
2020, resulting in a funded status of $79.0 million. Additionally, the Company’s accumulated postretirement benefit
obligation was $80.6 million, which is an unfunded liability.

We identified the evaluation of the Company’s measurement of the benefit obligations to be a critical audit matter. Subjective
auditor judgment was required to evaluate the discount rates, as minor changes in the rates could have a significant impact on
the benefit obligations. Additionally, the assessment of the discount rates required specialized actuarial skills and knowledge.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and
tested the operating effectiveness of certain internal controls over the Company’s benefit obligations process, including
controls related to the actuarial determination of the discount rates used in the valuation of the benefit obligations.
Additionally, we involved an actuarial professional with specialized skill and knowledge, who assisted in the evaluation of
the Company’s discount rates by:

•

•

•

assessing changes in the discount rates from the prior year against changes in published indices;

assessing the discount rates based on the plan type, plan provisions and pattern of cash flows; and

evaluating the selected yield curve, the consistency of the yield curve with the prior year, and the spot rates.

Fair value of contingent consideration

As discussed in Note 5 to the consolidated financial statements, in July 2020, the Company acquired TURF Design Inc.
(TURF) for $70.0 million of cash and potential for a contingent consideration payable in 2022 and 2023. The contingent
consideration liability is recorded at fair value and re-measured each reporting period, with a maximum payout of $48.0
million upon achievement of certain revenue and earnings before interest, income taxes, depreciation and amortization
(EBITDA) growth targets through 2022. A Monte Carlo model was used in the determination of the fair value of the
contingent consideration and required the Company to derive assumptions such as forecasts of revenue, forecasts of
EBITDA, volatility and discount rate. As of December 31, 2020, the fair value of the contingent consideration was $14.2
million.

We identified the evaluation of the fair value of the contingent consideration liability for the acquisition of TURF to be a
critical audit matter. Subjective auditor judgment was required to evaluate key assumptions in the Monte Carlo model used to
determine the fair value of the contingent consideration. Key assumptions included forecasts of revenue, forecasts of
EBITDA, volatility and discount rates. Auditing the Company’s model involved complex and challenging auditor judgment
as the assumptions used in the model did not have observable market inputs.

The following are the primary procedures we performed to address this critical audit matter. We performed sensitivity
analyses over the forecasted revenue and EBITDA used to determine the fair value of the contingent consideration to assess
the impact of changes in those assumptions on the Company’s determination of fair value. We evaluated the design and
tested the operating effectiveness of certain internal controls over the Company’s contingent consideration valuation process,
including controls over the key assumptions listed above. In connection with our assessment of the revenue and EBITDA
forecasts used in the valuation, we compared forecasted revenue and EBITDA as a percentage of revenue to historical actual
results of the acquired company. We evaluated the forecasted revenue and EBITDA assumptions used in the Company’s
model by comparing them to publicly available market data. In addition, we involved valuation professionals with specialized
skills and knowledge, who assisted in:

•

•

•

evaluating the Company’s selection of an appropriate valuation model for the contingent consideration;

assessing the selected volatility rates by comparing them against publicly available market data of comparable
companies

evaluating the discount rates by comparing them against ranges that were developed using publicly available market data
for comparable entities and entity-specific data.

40

/s/ KPMG LLP

We have served as the Company’s auditor since 1929.

Philadelphia, Pennsylvania
February 23, 2021

41

Armstrong World Industries, Inc., and Subsidiaries
Consolidated Statements of Operations and Comprehensive Income
(amounts in millions, except per share data)

Net sales
Cost of goods sold
Gross profit
Selling, general and administrative expenses
Gain related to sale of fixed and intangible assets
Equity earnings from joint venture
Operating income
Interest expense
Other non-operating expense (income), net
(Loss) earnings from continuing operations before income taxes
Income tax (benefit) expense
(Loss) earnings from continuing operations
Net (loss) earnings from discontinued operations, net of tax expense of $ -,
$12.0 and $8.2
(Loss) from disposal of discontinued businesses, net of tax (benefit) of ($1.4),
($5.2) and ($6.0)
Net (loss) from discontinued operations
Net (loss) earnings
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments
Derivative (loss) gain, net
Pension and postretirement adjustments
Total other comprehensive income (loss)
Total comprehensive income
(Loss) earnings per share of common stock, continuing operations:
Basic
Diluted
(Loss) per share of common stock, discontinued operations:
Basic
Diluted
Net (loss) earnings per share of common stock:
Basic
Diluted
Average number of common shares outstanding:
Basic
Diluted

$

$

$

$
$

$
$

$
$

Years Ended December 31,

2020

2019

2018

$

936.9
603.8
333.1
163.3
(21.0)
(64.0)
254.8
24.1
357.4
(126.7)
(42.6)
(84.1)

-

(15.0)
(15.0)
(99.1) $

(7.1)
(10.5)
284.4
266.8
167.7

$

(1.76) $
(1.76) $

(0.31) $
(0.31) $

(2.07) $
(2.07) $

47.9
47.9

1,038.1
643.0
395.1
174.3
-
(96.6)
317.4
38.4
(20.4)
299.4
57.1
242.3

(1.8)

(26.0)
(27.8)
214.5

84.1
(13.9)
13.2
83.4
297.9

4.97
4.88

$

$

$

$
$

(0.57) $
(0.56) $

$
$

4.40
4.32

48.7
49.5

975.3
641.8
333.5
159.0
-
(74.9)
249.4
39.2
(32.5)
242.7
53.1
189.6

9.6

(13.3)
(3.7)
185.9

(27.6)
1.1
(32.9)
(59.4)
126.5

3.68
3.63

(0.07)
(0.07)

3.61
3.56

51.3
52.1

See accompanying notes to consolidated financial statements beginning on page 46.

42

Armstrong World Industries, Inc., and Subsidiaries
Consolidated Balance Sheets
(amounts in millions, except share data)

Assets

December 31, 2020

December 31, 2019

Current assets:

Cash and cash equivalents
Accounts and notes receivable, net
Inventories, net
Income taxes receivable
Other current assets

Total current assets
Property, plant, and equipment, net
Operating lease assets
Finance lease assets
Prepaid pension costs
Investment in joint venture
Goodwill
Intangible assets, net
Deferred income taxes
Income taxes receivable
Other non-current assets
Total assets

Liabilities and Shareholders' Equity

Current liabilities:

Current installments of long-term debt
Accounts payable and accrued expenses
Operating lease liabilities
Finance lease liabilities
Income taxes payable

Total current liabilities

Long-term debt, less current installments
Operating lease liabilities
Finance lease liabilities
Postretirement benefit liabilities
Pension benefit liabilities
Other long-term liabilities
Income taxes payable
Deferred income taxes

Total non-current liabilities

Shareholders' equity:
Common stock, $0.01 par value per share, 200 million shares authorized, 62,599,331

shares issued and 47,913,821 shares outstanding as of December 31, 2020 and
62,263,395, shares issued and 47,992,348 shares outstanding as of December 31, 2019

Capital in excess of par value
Retained earnings
Treasury stock, at cost, 14,685,510 shares as of December 31, 2020 and 14,271,047

shares as of December 31, 2019

Accumulated other comprehensive (loss)
Total shareholders' equity
Total liabilities and shareholders' equity

$

$

$

$

$

$

$

136.9
78.3
81.5
2.3
12.8
311.8
529.9
19.2
20.4
119.5
41.2
160.7
457.5
-
0.6
57.7
1,718.5

25.0
136.5
4.8
2.0
4.0
172.3
690.5
14.6
18.8
74.9
40.4
76.5
21.2
158.4
1,095.3

0.6
553.7
869.8

(863.9)
(109.3)
450.9
1,718.5

$

45.3
85.1
68.5
30.0
15.5
244.4
524.6
35.3
-
94.8
58.5
53.0
411.9
10.4
2.5
57.9
1,493.3

6.3
143.5
5.2
-
0.2
155.2
604.5
30.1
-
71.0
46.6
37.8
19.3
163.9
973.2

0.6
555.7
1,008.2

(823.5)
(376.1)
364.9
1,493.3

See accompanying notes to consolidated financial statements beginning on page 46.

43

Armstrong World Industries, Inc., and Subsidiaries
Consolidated Statements of Shareholders’ Equity
(amounts in millions, except share data)

Common Stock
Shares

Amount

Additional
Paid-In
Capital

Retained
Earnings
516.8 $ 598.2

Treasury Stock
Shares
8,010,597 $ (385.6) $

Amount

Accumulated
Other
Comprehensive
(Loss)

December 31, 2017
Cumulative effect impact of ASU 2018-02

adoption

Stock issuance, net
Cash dividends - $0.175 per common share
Share-based employee compensation
Net earnings
Other comprehensive (loss)
Acquisition of treasury stock
December 31, 2018

Cumulative effect impact of ASU 2017-12

adoption

Stock issuance, net
Cash dividends - $0.725 per common share
Share-based employee compensation
Net earnings
Other comprehensive income
Acquisition of treasury stock
December 31, 2019

Stock issuance, net
Cash dividends - $0.810 per common share
Share-based employee compensation
Net (loss)
Other comprehensive income
Restricted stock issued to employees in
connection with acquisition
Acquisition of treasury stock
December 31, 2020

52,772,139 $

0.6 $

-
770,988
-
-
-
-
(4,734,888)
48,808,239 $

-
709,671
-
-
-
-
(1,525,562)
47,992,348 $

335,936
-
-
-
-

-
-
-
-
-
-
-
0.6 $

-
-
-
-
-
-
-
0.6 $

-
-
-
-
-

94,230
(508,693)
47,913,821 $

-
-
0.6 $

-
-
-
30.6
-
-
-

54.3
-
(8.6)
-
185.9
-
-

-
-
-
-
-
-
4,734,888

-
-
-
-
-
-
(306.6)

547.4 $ 829.8 12,745,485 $ (692.2) $

-
-
-
8.3
-
-
-

(0.1)
-
(36.0)
-
214.5
-
-

-
-
-
-
-
-
1,525,562

-
-
-
-
-
-
(131.3)

555.7 $1,008.2 14,271,047 $ (823.5) $

-
-
2.0
-
-

(4.0)
-

-
(39.3)
-
(99.1)
-

-
-
-
-
-

-
-
-
-
-

-
-

(94,230)
508,693

4.0
(44.4)

553.7 $ 869.8 14,685,510 $ (863.9) $

Total

(345.9) $ 384.1

(54.3)
-
-
-
-
(59.4)
-

-
-
(8.6)
30.6
185.9
(59.4)
(306.6)
(459.6) $ 226.0

0.1
-
-
-
-
83.4
-

-
-
(36.0)
8.3
214.5
83.4
(131.3)
(376.1) $ 364.9

-
-
-
-
266.8

-
(39.3)
2.0
(99.1)
266.8

-
-

-
(44.4)
(109.3) $ 450.9

See accompanying notes to consolidated financial statements beginning on page 46.

44

Armstrong World Industries, Inc., and Subsidiaries
Consolidated Statements of Cash Flows
(amounts in millions)

Cash flows from operating activities:

Net (loss) earnings

Adjustments to reconcile net (loss) earnings to net cash provided by operating activities:

2020

Years Ended December 31,
2019

2018

$

(99.1)

$

214.5

$

185.9

Depreciation and amortization
Loss on disposal of discontinued operations
Write-off of debt refinancing fees
Gain related to sale of fixed and intangible assets
Deferred income taxes
Share-based compensation
Equity earnings from joint venture
U.S. pension cost (credit)
Other non-cash adjustments, net

Changes in operating assets and liabilities:

Receivables
Inventories
Accounts payable and accrued expenses
Income taxes receivable and payable, net
Other assets and liabilities

Net cash provided by operating activities
Cash flows from investing activities:

Purchases of property, plant and equipment
Return of investment from joint venture
Cash paid for acquisitions, net of cash acquired
Proceeds from the sale of assets
Cash consideration received from Knauf
Payments of proceeds from Knauf to investment in joint venture
Payments to Knauf upon disposal of discontinued operations
Proceeds from company-owned life insurance, net

Net cash (used for) provided by investing activities
Cash flows from financing activities:
Proceeds from short-term debt
Payments of short-term debt
Payments for finance leases
Proceeds from revolving credit facility
Payments of revolving credit facility
Proceeds from long-term debt
Payments of long-term debt
Financing costs
Dividends paid
(Payments) proceeds from share-based compensation plans, net of tax
Payments for treasury stock acquired

Net cash provided by (used for) financing activities
Effect of exchange rate changes on cash and cash equivalents
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of year of discontinued operations
Cash and cash equivalents at beginning of year of continuing operations
Cash and cash equivalents at end of period
Cash and cash equivalents at end of period of discontinued operations
Cash and cash equivalents at end of period of continuing operations
Supplemental Cash Flow Disclosures:

Interest paid
Income tax payments, net
Amounts in accounts payable for capital expenditures

84.0
16.4
-
(21.0)
(89.3)
6.8
(64.0)
367.7
0.9

12.7
(7.7)
(11.8)
35.2
(12.0)
218.8

(55.4)
81.5
(164.6)
21.7
-
(25.9)
(6.4)
8.0
(141.1)

30.0
(30.0)
(1.8)
290.0
(180.0)
-
(6.3)
-
(39.2)
(4.8)
(44.4)
13.5
0.4
91.6
-
45.3
136.9
-
136.9

24.1
10.9
1.0

$

$

72.1
31.2
2.7
-
14.0
9.5
(96.6)
(7.5)
2.5

(1.1)
(7.2)
(19.9)
(8.4)
(23.1)
182.7

(71.3)
85.2
(56.4)
-
-
-
(47.9)
1.3
(89.1)

-
-
-
185.0
(70.0)
500.0
(825.4)
(2.9)
(35.6)
(4.7)
(131.3)
(384.9)
0.9
(290.4)
10.0
325.7
45.3
-
45.3

33.1
58.4
1.9

$

$

79.4
19.3
-
-
(3.8)
14.0
(74.9)
(26.3)
2.9

13.2
(8.9)
5.4
7.5
(10.5)
203.2

(71.9)
141.7
(22.2)
-
330.0
(70.0)
-
2.0
309.6

-
-
-
-
-
-
(32.5)
-
(8.6)
18.4
(306.6)
(329.3)
(7.4)
176.1
-
159.6
335.7
10.0
325.7

29.9
51.6
1.9

$

$

See accompanying notes to consolidated financial statements beginning on page 46.

45

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

NOTE 1. BUSINESS

Armstrong World Industries, Inc. (“AWI”) is a Pennsylvania corporation incorporated in 1891. When we refer to “AWI,” the
“Company,” “we,” “our” and “us” in these notes, we are referring to AWI and its subsidiaries.

Acquisitions

In December 2020, we acquired all of the issued and outstanding equity of Arktura LLC (“Arktura”) and certain subsidiaries with
operations in the United States and Argentina. Arktura is a designer and fabricator of metal and felt ceilings, walls, partitions and
facades with one manufacturing facility based in Los Angeles, California.

In August 2020, we acquired the business and assets of Moz Designs, Inc. (“Moz”), based in Oakland, California. Moz is a designer
and fabricator of custom architectural metal ceilings, walls, dividers and column covers for interior and exterior applications with one
manufacturing facility.

In July 2020, we acquired all of the issued and outstanding capital stock of TURF Design, Inc. (“Turf”), with one manufacturing
facility in Elgin, Illinois and a design center in Chicago, Illinois. Turf is a designer and manufacturer of acoustic felt ceilings and wall
products.

In November 2019, we acquired the business and assets of MRK Industries, Inc. (“MRK”), based in Libertyville, Illinois. MRK is a
manufacturer of specialty metal ceiling, wall and exterior solutions with one manufacturing facility.

In March 2019, we acquired the business and assets of Architectural Components Group, Inc. (“ACGI”), based in Marshfield,
Missouri. ACGI is a manufacturer of custom wood ceilings and walls with one manufacturing facility.

In August 2018, we acquired the business and assets of Steel Ceilings, Inc. (“Steel Ceilings”), based in Johnstown, Ohio. Steel
Ceilings is a manufacturer of aluminum and stainless metal ceilings that include architectural, radiant and security solutions with one
manufacturing facility.

In May 2018, we acquired the business and assets of Plasterform, Inc. (“Plasterform”), based in Mississauga, Ontario, Canada.
Plasterform is a manufacturer of architectural cast ceilings, walls, facades, columns and moldings with one manufacturing facility.

The operations, assets and liabilities of these acquisitions are included in our Architectural Specialties segment. See Note 5 for further
information on our recent acquisitions.

Discontinued Operations

On September 30, 2019, we completed the sale of certain subsidiaries comprising our businesses and operations in Europe, the Middle
East and Africa (including Russia) (“EMEA”) and the Pacific Rim, including the corresponding businesses and operations conducted
by Worthington Armstrong Venture (“WAVE”), our joint venture with Worthington Industries, Inc. (“Worthington”) in which AWI
holds a 50% interest (collectively, the “Sale”), to Knauf International GmbH (“Knauf”). The purchase price of $330.0 million was
previously paid by Knauf to us during 2018 and was subject to certain post-closing adjustments for cash and debt as provided in the
Purchase Agreement dated as of November 17, 2017, by and between us and Knauf (the “Purchase Agreement”), including
adjustments based on the economic impact of any required regulatory remedies and a working capital adjustment. During 2020, we
remitted $25.9 million, respectively, to WAVE for their remaining portion of the proceeds from Knauf. Also during 2020, WAVE
paid each of AWI and Worthington dividends of $13.0 million relating to these payments. During the third quarter of 2020, we
remitted $6.4 million to Knauf for working capital and other adjustments. In January 2021, we finalized the post-closing adjustments
to purchase price related to certain pension liabilities assumed by Knauf in the Sale. During the fourth quarter of 2020, we recorded a
$12.0 million loss primarily related to this purchase price adjustment, which is reflected within accounts payable and accrued expenses
as of December 31, 2020.

In 2019, we entered into a Transition Services Agreement with Knauf for its benefit and the benefit of a buyer of certain businesses
divested by Knauf, pursuant to which we provided certain transition technology, finance and information technology support services.
The Transition Services Agreement expired in 2020. In connection with the closing of the Sale, we also entered into (i) a royalty-free
intellectual property License Agreement with Knauf under which they, and the buyers of certain businesses divested by Knauf, license
patents, trademarks and know-how from us for use in licensed territories in which the business was conducted prior to the Sale, and
(ii) a Supply Agreement with Knauf under which the parties may continue to purchase certain products from each other following the

46

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

closing of the Sale. WAVE also entered into similar agreements with Knauf for such purposes. The term of the granted licenses, with
respect to each intellectual property right, extend until the expiration or abandonment of each such intellectual property right.

The EMEA and Pacific Rim segment historical financial results through September 30, 2019 have been reflected in AWI’s
Consolidated Statements of Operations and Comprehensive Income as discontinued operations for all periods presented, while the
assets and liabilities of discontinued operations have been removed from AWI’s Consolidated Balance Sheet as of December 31,
2019.

COVID-19 Considerations

The COVID-19 outbreak has created significant volatility and economic disruption and the impact on our future consolidated results
of operations is uncertain. The extent to which COVID-19 impacts our employees, operations, customers, suppliers and financial
results depends on numerous evolving factors that we are not able to accurately predict, including: the duration and scope of the
pandemic; government actions taken in response to the pandemic; the availability and distribution of vaccinations; the impact on
construction activity; the effect on our customers demand for our ceiling and wall systems; our ability to manufacture and sell our
products; and the ability of our customers to pay for our products. While many of our products support life sustaining activities and
essential construction, we, and certain of our customers or suppliers, may be impacted by state actions, orders and policies regarding
the COVID-19 pandemic, including temporary closures of non-life sustaining businesses, shelter-in-place orders, and travel, social
distancing and quarantine policies, the implementation and enforcement of which vary by individual U.S. states and by individual
countries in the Americas. We did not record any asset impairments, inventory charges or material bad debt reserves related to
COVID-19 during 2020 but future events may require such charges, which could have a material adverse effect on our financial
condition, liquidity or results of operations.

NOTE 2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Consolidation Policy. The consolidated financial statements and accompanying data in this report include the accounts of AWI and its
majority-owned subsidiaries. All significant intercompany transactions have been eliminated from the consolidated financial
statements.

Use of Estimates. We prepare our financial statements in conformity with U.S. Generally Accepted Accounting Principles (“U.S.
GAAP”), which requires management to make estimates and assumptions. These estimates and assumptions affect the reported
amounts of assets, liabilities, revenues and expenses. When preparing an estimate, management determines the amount based upon
the consideration of relevant internal and external information. Actual results may differ from these estimates.

Reclassifications. Certain amounts in the prior year’s Consolidated Financial Statements and related notes have been recast to
conform to the 2020 presentation.

Revenue Recognition. On January 1, 2018, we adopted Accounting Standards Codification (“ASC”) 606 - Revenue from Contracts
with Customers and all the related amendments using the modified retrospective transition method. This adoption did not have a
material impact on our financial condition, results of operations or cash flows as the amount and timing of substantially all of our
revenues are recognized at a point in time.

We recognize revenue upon transfer of control of our products to the customer, which typically occurs upon shipment. Our main
performance obligation to our customers is the delivery of products in accordance with purchase orders. Each purchase order confirms
the transaction price for the products purchased under the arrangement. Direct sales to building materials distributors, home centers,
direct customers and retailers represent the majority of our sales. Our standard sales terms are Free On Board (“FOB”) shipping
point. We have some sales terms that are FOB destination. At the point of shipment, the customer is required to pay under normal
sales terms. Our normal payment terms in most cases are 45 days or less and our sales arrangements do not have any material
financing components. In addition, our customer arrangements do not produce contract assets or liabilities that are material to our
consolidated financial statements. Within our Architectural Specialties segment, the majority of revenues are customer project driven,
which includes a minority of revenues derived from the sale of customer specified customized products that have no alternative use to
us. The manufacturing cycle for these custom products is typically short.

Incremental costs to fulfill our customer arrangements are expensed as incurred, as the amortization period is less than one year.

47

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Our products are sold with normal and customary return provisions. We provide limited warranties for defects in materials or factory
workmanship, sagging and warping, and certain other manufacturing defects. Warranties are not sold separately to customers. Our
product warranties place certain requirements on the purchaser, including installation and maintenance in accordance with our written
instructions. In addition to our warranty program, under certain limited circumstances, we will occasionally at our sole discretion
provide a customer accommodation repair or replacement. Warranty repairs and replacements are most commonly made by
professional installers employed by or affiliated with our independent distributors. Reimbursement for costs associated with warranty
repairs are provided to our independent distributors through a credit against accounts receivable from the distributor to us. Sales
returns and warranty claims have historically not been material and do not constitute separate performance obligations.

We often offer incentive programs to our customers, primarily volume rebates and promotions. The majority of our rebates are
designated as a percentage of annual customer purchases. We estimate the amount of rebates based on actual sales for the period and
accrue for the projected incentive programs costs. We record the costs of rebate accruals as a reduction to the transaction price. Other
sales discounts, including early pay promotions, are deducted immediately from the sales invoice.

See Note 4 to the Consolidated Financial Statements for additional information related to our revenues.

Shipping and Handling Costs. We account for product shipping and handling costs as fulfillment activities and present the associated
costs in costs of goods sold in the period in which we sell our product.

Advertising Costs. We recognize advertising expenses as they are incurred.

Research and Development Costs. We expense research and development costs as they are incurred.

Business Combinations. We account for acquisitions under the acquisition method and the results of acquired operations are included
in the Consolidated Financial Statements from the acquisition date. Acquisition related costs are expensed as incurred. We allocate
total consideration to the assets acquired and liabilities assumed based on their estimated fair values, with the remaining unallocated
amount recorded as goodwill. Our definite-lived intangible assets, and adjustments to the fair value of assets acquired and/or liabilities
assumed, are amortized over the estimated useful life on a straight-line basis and recorded as a component of operating income
(expense). The fair value of acquired intangible assets is estimated by applying discounted cash flow models based on significant level
3 inputs not observable in the market. Key assumptions are developed based on each acquirees’ historical experience, future
projections and comparable market data including future cash flows, long-term growth rates, implied royalty rates, attrition rates and
discount rates. Acquisition-related contingent consideration that is classified as a liability is measured at fair value at the acquisition
date. Changes in the fair value of contingent consideration liabilities recorded in reporting periods after the acquisition date are
recorded within selling, general and administrative (“SG&A”) expenses on our Consolidated Statements of Operations and
Comprehensive Income.

Pension and Postretirement Benefits. We have benefit plans that provide for pension, medical and life insurance benefits to certain
eligible employees when they retire from active service. See Note 18 to the Consolidated Financial Statements for disclosures on
pension and postretirement benefits.

Taxes. The provision for income taxes has been determined using the asset and liability approach of accounting for income taxes to
reflect the expected future tax consequences of events recognized in the financial statements. Deferred income tax assets and
liabilities are recognized by applying enacted tax rates to temporary differences that exist as of the balance sheet date, which result
from differences in the timing of reported taxable income between tax and financial reporting.

We reduce the carrying amounts of deferred tax assets by a valuation allowance if, based on the available evidence, it is more likely
than not that such assets will not be realized. The need to establish valuation allowances for deferred tax assets is assessed quarterly.
In assessing the requirement for, and amount of, a valuation allowance in accordance with the more likely than not standard, we give
appropriate consideration to all positive and negative evidence related to the realization of the deferred tax assets. This assessment
considers, among other matters, the nature, frequency and severity of current and cumulative losses, forecasts of future profitability
and foreign source income, the duration of statutory carryforward periods, and our experience with operating loss and tax credit
carryforward expirations. A history of cumulative losses is a significant piece of negative evidence used in our assessment. If a
history of cumulative losses is incurred for a tax jurisdiction, forecasts of future profitability are generally not used as positive
evidence related to the realization of the deferred tax assets in the assessment.

48

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

We recognize the tax benefits of an uncertain tax position if those benefits are more likely than not to be sustained based on existing
tax law. Additionally, we establish a reserve for tax positions that are more likely than not to be sustained based on existing tax law,
but uncertain in the ultimate benefit to be sustained upon examination by the relevant taxing authorities. Unrecognized tax benefits
are subsequently recognized at the time the more likely than not recognition threshold is met, the tax matter is effectively settled or the
statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, whichever is earliest.

Taxes collected from customers and remitted to governmental authorities are reported on a net basis.

Earnings per Share. Basic earnings per share is computed by dividing the earnings attributable to common shares by the weighted
average number of shares of common stock outstanding during the period. Diluted earnings per share reflects the potential dilution of
securities that could share in the earnings and is calculated using the treasury stock method.

Cash and Cash Equivalents. Cash and cash equivalents include cash on hand and short-term investments that have maturities of three
months or less when purchased.

Concentration of Credit. We principally sell products to customers in building products industries. Revenues from two commercial
distributors, included within our Mineral Fiber and Architectural Specialties segments, individually exceeded 10% of our revenues in
2020. Gross sales to these two customers totaled $370.3 million and $428.7 million in 2020 and 2019, respectively. Revenues from
three commercial distributors individually exceeded 10% of our revenues in 2018. Gross sales to these three customers totaled $459.3
million in 2018. We monitor the creditworthiness of our customers and generally do not require collateral.

Receivables. On January 1, 2020, we adopted ASC 326 – Financial Instruments – Credit Losses. This adoption did not have a material
impact on our financial condition, results of operations or cash flows.

We sell our products to select, pre-approved customers using customary trade terms that allow for payment in the future. Customer
trade receivables, customer notes receivable and miscellaneous receivables (which include supply related rebates and other), net of
allowances for doubtful accounts, customer credits and warranties are reported in accounts and notes receivable, net. Cash flows from
the collection of receivables are classified as operating cash flows on the Consolidated Statements of Cash Flows.

We establish creditworthiness prior to extending credit. We estimate the recoverability of receivables each period. This estimate is
based upon new information in the period, which can include the review of any available financial statements and forecasts, as well as
discussions with legal counsel and the management of the debtor company. As events occur, which impact the collectability of the
receivable, all or a portion of the receivable is reserved. Account balances are charged off against the allowance when the potential
for recovery is considered remote. We do not have any off-balance sheet credit exposure related to our customers.

Inventories. Inventories are valued at the lower of cost and net realizable value. See Note 8 to the Consolidated Financial Statements
for further information on our accounting for inventories.

Property Plant and Equipment. Property plant and equipment is recorded at cost reduced by accumulated depreciation and
amortization. Depreciation and amortization expense is recognized on a straight-line basis over the assets’ estimated useful lives.
Machinery and equipment includes manufacturing equipment (depreciated over 2 to 15 years), computer equipment (depreciated over
3 to 5 years) and office furniture and equipment (depreciated over 5 to 7 years). Within manufacturing equipment, assets that are
subject to accelerated obsolescence or wear out quickly, such as dryer components, are generally depreciated over shorter periods
while heavy production equipment, such as conveyors and production presses, are generally depreciated over longer periods.
Buildings are depreciated over 15 to 30 years, depending on factors such as type of construction and use. Computer software is
amortized over 3 to 7 years.

Property, plant and equipment is tested for impairment by asset group when indicators of impairment are present, such as operating
losses and/or negative cash flows for each identified asset group. If an indication of impairment exists, we compare the carrying
amount of the asset group to the estimated undiscounted future cash flows expected to be generated by the asset group. If the carrying
value exceeds the undiscounted future cash flows, we determine the fair value of the asset group based on discounted future cash
flows expected to be generated by the asset group, or based on management’s estimated exit price assuming the assets could be sold in
an orderly transaction between market participants, or estimated salvage value if no sale is assumed. If the fair value is less than the
carrying value of the asset group, we record an impairment charge equal to the difference between the fair value and carrying value of
the asset group. Impairments of assets related to our manufacturing operations are recorded in cost of goods sold. We did not test
tangible assets within our continuing operations for impairment in 2020, 2019 or 2018 as no indicators of impairment existed.

49

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

When assets are disposed of or retired, their costs and related depreciation or amortization are removed from the financial statements,
and any resulting gains or losses are normally reflected in cost of goods sold or SG&A expenses depending on the nature of the asset.

Leases. On January 1, 2019, we adopted ASC 842 - Leases and all the related amendments using the modified retrospective transition
method. Upon adoption of this standard, we recognized right-of-use (“ROU”) assets and lease liabilities of $29.2 million based on the
present value of the future minimum rental payments for our existing leases.

We enter into operating and finance leases for certain manufacturing plants, warehouses, equipment and automobiles. Our leases have
remaining lease terms of up to 17 years. Several leases include options for us to purchase leased items at fair value or renew for up to
5 years, or multiple 5-year renewal periods. Some of our leases include early termination options. We consider all of these options in
determining the lease term used to establish our ROU assets and lease liabilities when it is reasonably certain that we will exercise that
option. Our lease agreements do not contain any residual value guarantees or material restrictive covenants.

We have lease agreements with lease and nonlease components, which we have elected to combine to determine the ROU assets and
lease liabilities. Short-term leases with an initial term of 12 months or less are not recorded on the balance sheet. We recognize lease
expense for these leases on a straight-line basis over the lease term.

As most of our leases do not provide an implicit rate, we use our incremental borrowing rate (“IBR”) based on information that is
available at the lease commencement date to compute the present value of lease payments. Relevant information used in determining
the IBR includes the transactional currency of the lease and the lease term.

Asset Retirement Obligations. We recognize the fair value of obligations associated with the retirement of tangible long-lived assets in
the period in which they are incurred. Upon initial recognition of a liability, the discounted cost is capitalized as part of the related
long-lived asset and depreciated over the corresponding asset’s useful life. Over time, accretion of the liability is recognized as an
operating expense to reflect the change in the liability’s present value.

Goodwill and Intangible Assets. Our definite-lived intangible assets are primarily customer relationships (amortized over 1 to 20
years), developed technology (amortized over 13 to 19 years) and acquired internally-developed software (amortized over 7 years).
We review definite-lived intangible assets for impairment by asset group when indicators of impairment are present, such as operating
losses and/or negative cash flows for the respective asset group. If an indication of impairment exists, we compare the carrying
amount of the asset group to the estimated undiscounted future cash flows expected to be generated by the asset group. If the carrying
value exceeds the undiscounted future cash flows, we determine the fair value of the asset group based on discounted future cash
flows expected to be generated by the asset group or based on management’s estimated exit price assuming the assets could be sold in
an orderly transaction between market participants. If the fair value is less than the carrying value of the asset group, we record an
impairment charge equal to the difference between the fair value and carrying value of the asset group. We did not test definite-lived
intangible assets within our continuing operations for impairment in 2020, 2019 or 2018 as no indicators of impairment existed.

Our indefinite-lived assets include goodwill and other intangibles, primarily trademarks and brand names, with Armstrong
representing our primary trademark. Trademarks and brand names are integral to our corporate identity and are expected to contribute
indefinitely to our cash flows. Accordingly, they have been assigned an indefinite life. We conduct our annual impairment tests on
these indefinite-lived intangible assets and goodwill during the fourth quarter. These assets undergo more frequent tests if an
indication of possible impairment exists. When performing an impairment test for indefinite-lived intangible assets and goodwill, we
compare the carrying amount of the asset (when testing indefinite-lived intangible assets) and reporting unit (when testing goodwill) to
the estimated fair value. For indefinite-lived intangible assets, the estimated fair value is based on discounted future cash flows using
the relief from royalty method. For goodwill, the estimated fair value is based on discounted future cash flows expected to be
generated by the reporting unit. If the fair value is less than the carrying value of the asset/reporting unit, we record an impairment
charge equal to the difference between the fair value and carrying value of the asset/reporting unit. We did not test indefinite-lived
intangible assets within our continuing operations for impairment during any interim periods during 2020, as no indicators of
impairment existed. We completed our annual impairment test in the fourth quarter of 2020 and no impairment charges were recorded.

See Note 13 to the Consolidated Financial Statements for disclosure on intangible assets.

Foreign Currency Transactions. Assets and liabilities of our subsidiaries operating outside the United States which are accounted in a
functional currency other than U.S. dollars are translated using the period end exchange rate. Revenues and expenses are translated at
exchange rates effective during each month. Foreign currency translation gains or losses are included as a component of accumulated

50

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

other comprehensive (loss) within shareholders' equity. Gains or losses on foreign currency transactions are recognized through
earnings.

Financial Instruments and Derivatives. From time to time, we use derivatives and other financial instruments to offset the effect of
interest rate variability. Derivatives are recognized on the balance sheet at fair value. For derivatives that meet the criteria as
designated cash flow hedges, the changes in the fair value of the derivative are recognized in other comprehensive income (loss) until
the hedged item is recognized in operations. See Notes 19 and 20 to the Consolidated Financial Statements for further discussion.

Share-based Employee Compensation. We generally recognize share-based compensation expense on a straight-line basis over the
vesting period for the entire award. Compensation expense for performance-based awards with non-market-based conditions are also
recognized over the vesting period for the entire award, however, compensation expense may vary based on the expectations for actual
performance relative to defined performance measures. We estimate forfeitures based on actual historical forfeitures. See Note 22 to
the Consolidated Financial Statements for additional information on share-based employee compensation.

Treasury Stock. Common shares repurchased by AWI are recorded on the settlement date at cost as treasury shares and result in a
reduction of equity. We may reissue these treasury shares. When treasury shares are reissued, we determine the cost using the First-in,
first-out cost method (“FIFO”). The difference between the cost of the treasury shares and reissuance price is included in additional
paid-in capital or retained earnings.

Subsequent Events. On February 17, 2021, our Board of Directors declared a dividend of $0.21 per common share outstanding. The
dividend will be paid on March 18, 2021, to shareholders of record as of the close of business on March 4, 2021.

Recently Adopted Accounting Standards

In June 2016, the FASB issued ASU 2016-13, "Measurement of Credit Losses on Financial Instruments," which requires immediate
recognition of estimated credit losses that are expected to occur over the remaining life of many financial assets. This standard applies
to all financial assets, including trade receivables. Our current accounts receivable policy uses historical and current information to
estimate the amount of probable credit losses in our existing accounts receivable balances. Effective January 1, 2020, we adopted this
standard, which had no material impact on our financial condition, results of operations or cash flows.

In January 2017, the FASB issued ASU 2017-04, “Intangibles – Goodwill and Other,” which simplifies the subsequent measurement
of goodwill by eliminating the second step from the current goodwill impairment test. Under this standard, an entity recognizes an
impairment charge for the amount by which the carrying value of the reporting unit goodwill exceeds the fair value. Effective January
1, 2020, we adopted this standard prospectively. Our adoption of this standard had no impact on our financial condition or results of
operations.

In August 2018, the FASB issued ASU 2018-13, “Changes to the Disclosure Requirements for Fair Value Measurement.” This
standard eliminates the requirement to disclose the amount or reason for transfers between level 1 and level 2 of the fair value
hierarchy and the requirement to disclose the valuation methodology for level 3 fair value measurements. The standard includes
additional disclosure requirements for level 3 fair value measurements, including the requirement to disclose the changes in unrealized
gains and losses in other comprehensive income during the period and permits the disclosure of other relevant quantitative information
for certain unobservable inputs. Effective January 1, 2020, we adopted this standard, which resulted in additional disclosures for level
3 fair value measurements.

In August 2018, the FASB issued ASU 2018-14, “Disclosure Framework – Changes to the Disclosure Requirements for Defined
Benefit Plans,” which amends ASC 715-20, Compensation – Retirement Benefits – Defined Benefit Plans. The ASU modifies the
disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The disclosure requirements
to be removed include the amounts in accumulated other comprehensive income expected to be recognized in net periodic benefit
costs over the next fiscal year, the amount and timing of plan assets expected to be returned to the employer and the effect of a one
percentage point change in assumed health care cost trend rates on the aggregate service cost and benefit obligation for postretirement
health care benefits. The new disclosure requirements include the interest crediting rates for cash balance plans, and an explanation of
significant gains and losses related to changes in benefit obligations. Effective the fourth quarter of 2020, we adopted this standard
which resulted in changes to our disclosures.

In August 2018, the FASB issued ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing
Arrangement That is a Service Contract,” which amends ASC 350-40 Intangibles – Goodwill and Other – Internal-Use Software. The

51

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

ASU requires implementation costs incurred by customers in cloud computing arrangements to be deferred and recognized over the
term of the arrangement, if these costs were capitalized by the customer in a software licensing arrangement. Effective January 1,
2020, we adopted this standard prospectively. Our adoption of this standard had no material impact on our financial condition, results
of operations or cash flows.

In March 2020, the FASB issued ASU 2020-04, “Facilitation of the Effects of Reference Rate Reform on Financial Reporting,” which
provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions
affected by the discontinuation of the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates. This guidance is
effective through December 31, 2022. Effective the second quarter of 2020 we adopted this standard, which had no impact on our
financial condition, results of operations and cash flows.

Recently Issued Accounting Standards

In December 2019, the FASB issued ASU 2019-12, “Simplifying the Accounting for Income Taxes,” which removes exceptions to the
general principles in ASC Topic 740 – Income Taxes for allocating tax expense between financial statement components, accounting
basis differences resulting from an ownership change in foreign investments and interim period income tax accounting for year-to-date
losses that exceed projected losses. This guidance is effective for fiscal years beginning after December 15, 2020. We are evaluating
the impact the adoption of this standard will have on our financial condition and results of operations.

NOTE 3. NATURE OF OPERATIONS

Our operating segments are as follows: Mineral Fiber, Architectural Specialties and Unallocated Corporate.

Mineral Fiber – produces suspended mineral fiber and soft fiber ceiling systems for use in commercial and residential settings.
Products offer various performance attributes such as acoustical control, rated fire protection, aesthetic appeal and health attributes.
Commercial ceiling products are sold to resale distributors and to ceiling systems contractors. Residential ceiling products are sold
primarily to wholesalers and retailers (including large home centers). The Mineral Fiber segment also includes the results of WAVE,
which manufactures and sells suspension system (grid) products and ceiling component products that are invoiced by both AWI and
WAVE. Segment results relating to WAVE consist primarily of equity earnings and reflect our 50% equity interest in the joint
venture. Ceiling component products consist of ceiling perimeters and trim, in addition to grid products that support drywall ceiling
systems. To a lesser extent, however, in some geographies and for some customers, WAVE sells its suspension systems products to
AWI for resale to customers. Mineral Fiber segment results reflect those sales transactions. The Mineral Fiber segment also includes
all assets and liabilities not specifically allocated to our Architectural Specialties or Unallocated Corporate segment, including all
property and related depreciation associated with our Lancaster, PA headquarters. Operating results for the Mineral Fiber segment
include a significant majority of allocated Corporate administrative expenses that represent a reasonable allocation of general services
to support its operations.

Architectural Specialties – produces and sources ceilings and walls for use in commercial settings. Products are available in numerous
materials, such as metal and wood, in addition to various colors, shapes and designs. Products offer various performance attributes
such as acoustical control, rated fire protection and aesthetic appeal. We sell standard and customized products, and a portion of our
Architectural Specialties revenues are derived from sourced products. Architectural Specialties products are sold primarily to resale
distributors and ceiling systems contractors. The majority of revenues are project driven, which can lead to more volatile sales
patterns due to project scheduling uncertainty. Operating results for the Architectural Specialties segment include a portion of
allocated Corporate administrative expenses that represent a reasonable allocation of general services to support its operations.

Unallocated Corporate – includes assets, liabilities, income and expenses that have not been allocated to our other business segments
and consists of cash and cash equivalents, the net funded status of our U.S. Retirement Income Plan (“RIP”), the estimated fair value
of interest rate swap contracts, outstanding borrowings under our senior credit facility and income tax balances. Our Unallocated
Corporate segment also includes all assets, liabilities, income and expenses formerly reported in our EMEA and Pacific Rim segments
that were not included in the Sale.

52

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

For the year ended 2020

Net sales to external customers
Equity (earnings) from joint venture
Segment operating income
Segment assets
Depreciation and amortization
Investment in joint venture
Purchases of property, plant and equipment

For the year ended 2019

Net sales to external customers
Equity (earnings) from joint venture
Segment operating income (loss)
Segment assets
Depreciation and amortization
Investment in joint venture
Purchases of property, plant and equipment (1)

For the year ended 2018

Net sales to external customers
Equity (earnings) from joint venture
Segment operating income (loss)
Segment assets
Depreciation and amortization
Investment in joint venture
Purchases of property, plant and equipment (1)

Mineral Fiber
726.0
$
(64.0)
218.7
1,101.1
71.8
41.2
45.5

Mineral Fiber
826.6
$
(96.6)
289.6
1,139.9
62.9
58.5
59.5

Mineral Fiber
801.6
$
(74.9)
223.8
1,096.1
75.3
40.8
60.5

$

$

$

Architectural
Specialties

Unallocated
Corporate

$

$

210.9
-
22.3
357.7
12.2
-
9.9

-
-
13.8
259.7
-
-
-

Architectural
Specialties

Unallocated
Corporate

$

$

211.5
-
35.9
161.8
8.8
-
8.8

-
-
(8.1)
191.6
0.4
-
-

Architectural
Specialties

Unallocated
Corporate

$

$

173.7
-
34.3
84.7
3.5
-
4.1

-
-
(8.7)
413.2
0.6
-
-

Total

936.9
(64.0)
254.8
1,718.5
84.0
41.2
55.4

Total

1,038.1
(96.6)
317.4
1,493.3
72.1
58.5
68.3

Total

975.3
(74.9)
249.4
1,594.0
79.4
40.8
64.6

(1) Total differs from our Consolidated Statement of Cash Flows by the amount that was classified as discontinued operations.

See Note 6 for additional details.

Segment operating income (loss) is the measure of segment profit or loss reviewed by the chief operating decision maker. The sum of
the segments’ operating income (loss) equals the total consolidated operating income as reported on our Consolidated Statements of
Operations and Comprehensive Income. The following reconciles our total consolidated operating income to (loss) earnings from
continuing operations before income taxes. These items are only measured and managed on a consolidated basis:

Total consolidated operating income
Interest expense
Other non-operating expense (income), net
(Loss) earnings from continuing operations before income taxes

2020

2019

2018

$

$

$

254.8
24.1
357.4
(126.7) $

317.4
38.4
(20.4)
299.4

$

$

249.4
39.2
(32.5)
242.7

Accounting policies of the segments are the same as those described in the summary of significant accounting policies.

53

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

The sales in the table below are allocated to geographic areas based on the location of our selling entities.

Geographic Areas
Net sales
Mineral Fiber:

United States
Canada

Total Mineral Fiber

Architectural Specialties:

United States
Canada

Total Architectural Specialties
Total net sales

Property, plant and equipment, net at December 31,
Mineral Fiber:

United States
Total Mineral Fiber

Architectural Specialties:

United States
Canada

Total Architectural Specialties
Total property, plant and equipment, net

2020

2019

2018

$

$

$

674.1
51.9
726.0

192.8
18.1
210.9
936.9

$

$

$

769.0
57.6
826.6

192.3
19.2
211.5
1,038.1

$

$

$

2020

2019

$

$

$

486.0
486.0

38.2
5.7
43.9
529.9

$

$

$

739.2
62.4
801.6

157.5
16.2
173.7
975.3

496.6
496.6

22.2
5.8
28.0
524.6

During 2020, we recorded a $21.0 million gain related to the sale of our idled mineral fiber plant in China, inclusive of accumulated
foreign currency translation gains.

In connection with the 2018 closing of our St. Helens, Oregon Mineral Fiber manufacturing facility we recorded $14.1 million in 2018
in cost of goods sold related to accelerated depreciation of property, plant and equipment.

NOTE 4. REVENUE

Disaggregation of Revenues

Our Mineral Fiber and Architectural Specialties operating segments both manufacture and sell ceiling and wall systems (primarily
mineral fiber, fiberglass wool, metal, wood, wood fiber, glass-reinforced-gypsum and felt) throughout the Americas. We disaggregate
revenue based on our product-based segments and major customer channels, as they represent the most appropriate depiction of how
the nature, amount and timing of revenues and cash flows are affected by economic factors. Net sales by major customer channel are
as follows:

Distributors – represents net sales to building materials distributors who re-sell our products to contractors, subcontractors’ alliances,
large architect and design firms, and major facility owners. Geographically, this category includes sales throughout the U.S., Canada,
and Latin America.

Home centers – represents net sales to home centers, such as Lowe’s Companies, Inc. and The Home Depot, Inc. This category
includes sales primarily to U.S. customers.

Direct customers – represents net sales to contractors, subcontractors, and large architect and design firms. This category includes
sales primarily to U.S. customers.

54

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Retailers and other – represents net sales to independent retailers and certain national account customers, including wholesalers who
re-sell our products to dealers who service builders, contractors and consumers, online customers, major facility owners, group
purchasing organizations and maintenance, repair and operating (“MRO”) entities. Geographically, this category includes sales
throughout the U.S. and Canada.

The following tables provide net sales by major customer group within the Mineral Fiber and Architectural Specialties segments for
the years ended December 31, 2020, 2019 and 2018:

Mineral Fiber
Distributors
Home centers
Direct customers
Retailers and other
Total

Architectural Specialties
Distributors
Direct customers
Retailers and other
Total

NOTE 5. ACQUISITIONS

ARKTURA

2020

2019

2018

$

$

$

$

525.2
96.1
54.3
50.4
726.0

2020

135.5
73.3
2.1
210.9

$

$

$

$

622.9
85.2
61.2
57.3
826.6

2019

138.3
68.0
5.2
211.5

$

$

$

$

601.4
84.0
60.3
55.9
801.6

2018

129.8
36.7
7.2
173.7

On December 16, 2020, we acquired all the issued and outstanding equity of Arktura LLC (“Arktura”) and its subsidiaries with
operations in the United States and Argentina for $90.6 million of cash paid at closing, net of $0.8 million of cash acquired, subject to
customary post-closing adjustments for working capital. A portion of the cash consideration paid at closing is being held in escrow to
secure potential claims for indemnification under the agreement. Under the terms of the agreement, and contingent upon continued
employment with AWI over the next five years, we are obligated to pay the sellers an additional $24.0 million in cash payments over a
period of five years and issued an additional $6.0 million of restricted stock which will vest over a period of five years. Contingent
upon employment with AWI over the next three years, we also issued an additional $1.4 million of restricted stock to key Arktura
employees which will vest over a period of three years. Compensation expense associated with these cash payments and restricted
stock awards will be recorded over the required service and vesting periods.

The total fair value of tangible assets acquired, less liabilities assumed, was $4.1 million. The total fair value of identifiable intangible
assets acquired was $36.2 million, resulting in $51.1 million of goodwill. We identified non-amortizable tradenames of $14.5 million.
We also identified amortizable intangible assets comprised of software of $9.1 million, backlog of $5.9 million, customer relationships
of $3.3 million, a non-compete agreement of $2.8 million and patents of $0.6 million that are being amortized on a straight-line basis
over a weighted average life of 7, 1, 1, 5, and 17 years, respectively. The weighted average amortization period for acquired intangible
assets as of the date of acquisition was 4.3 years. Goodwill from the Arktura acquisition relates to many factors, including the
technical competencies and capabilities of the acquired workforce in the fields of architecture, design, materials science, technology
and software, and our strategic intent to integrate and leverage those competencies and capabilities to advance and expand our
portfolio of solutions and offerings. All of the acquired goodwill is deductible for tax purposes.

Valuations for assets acquired and liabilities assumed are based on provisional estimates. We will continue to evaluate the fair value of
assets acquired and liabilities assumed related to the acquisition. Additional information, which existed as of the acquisition date, but
was at that time unknown to us, may become known during the remainder of the measurement period. Changes to amounts recorded
may result in a corresponding adjustment to these assets and liabilities, including goodwill. The determination of the estimated fair
values of all assets acquired and liabilities assumed is expected to be completed within one year from the date of acquisition.

55

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

In connection with the Arktura acquisition, we formed Arktura Ventures LLC, an incubator entity for the development and
commercialization of new products and solutions in the architecture, engineering and construction space. As of December 31, 2020,
the venture entity had no funding or operations.

MOZ

On August 24, 2020, we acquired the business and assets of Moz for $4.2 million of cash paid at closing and the potential for a
contingent earn out payable in 2022 not to exceed $4.7 million. We, with the assistance of an independent, third-party valuation
specialist, utilized a Monte Carlo simulation to determine the estimated fair value of the contingent consideration of $2.7 million,
resulting in total acquisition consideration of $6.9 million. The total fair value of liabilities assumed, less tangible assets acquired, was
$0.4 million. The total fair value of identifiable intangible assets acquired was $2.7 million, comprised of non-amortizable tradenames
of $1.5 million, amortizable customer relationships of $0.6 million and backlog of $0.6 million, resulting in $4.6 million of goodwill.
All of the acquired goodwill is deductible for tax purposes. The contingent consideration is payable upon achievement of certain
future performance objectives through December 31, 2021. See Note 19 for changes in fair value of contingent consideration.

TURF

On July 27, 2020, we acquired all the issued and outstanding capital stock of Turf for a purchase price of $70.0 million of cash paid at
closing and the potential for a contingent earn out payable in 2022 and 2023 not to exceed $48.0 million. We, with the assistance of an
independent, third-party valuation specialist, utilized a Monte Carlo simulation to determine the estimated fair value of the contingent
consideration of $14.1 million, resulting in total acquisition consideration of $84.1 million. The total fair value of tangible assets
acquired, less liabilities assumed, was $4.8 million. The total fair value of identifiable intangible assets acquired was $27.9 million,
resulting in $51.4 million of goodwill. We identified non-amortizable tradenames of $9.6 million. We also identified amortizable
intangible assets comprised of customer relationships of $7.7 million, patents of $5.8 million and a non-compete agreement of $3.3
million that are being amortized on a straight-line basis over a weighted average life of 2, 20, and 5 years, respectively. The weighted
average amortization period for acquired intangible assets as of the date of acquisition was 8.3 years. Goodwill from the Turf
acquisition relates to many factors, including the design talents of the acquired workforce, fabrication capabilities and capacity, broad-
based go-to-market channels and relationships, established leadership in a growing product category, and our strategic intent to
leverage its position and attributes to grow and expand our portfolio of solutions. All of the acquired goodwill is deductible for tax
purposes.

The contingent consideration is payable upon achievement of certain future performance objectives through 2022. The contingent
consideration includes up to $24.0 million in additional cash consideration for performance at certain revenue and earnings before
interest, taxes, depreciation and amortization (“EBITDA”) growth targets. Full payout for target performance requires compounded
annual growth rates in excess of 23% through December 31, 2022. The contingent consideration also includes up to $24.0 million in
additional cash consideration for performance over revenue and EBITDA growth targets. Full payout for achievement over target
performance requires compounded annual growth rates in excess of 38% through December 31, 2022. See Note 19 for changes in fair
value of contingent consideration.

MRK

On November 25, 2019, we acquired the business and assets of MRK. The $13.3 million purchase price was allocated to the assets
acquired and the liabilities assumed based on their estimated fair values, with the remaining unallocated amount recorded as goodwill.
The total fair value of tangible assets acquired, less liabilities assumed, was $2.9 million, resulting in $10.4 million of goodwill. All of
the acquired goodwill is deductible for tax purposes.

ACGI

On March 4, 2019, we acquired the business and assets of ACGI. The $42.9 million purchase price was allocated to the assets
acquired and the liabilities assumed based on their estimated fair values, with the remaining unallocated amount recorded as goodwill.
The total fair value of tangible assets acquired, less liabilities assumed, was $7.3 million. The total fair value of identifiable intangible
assets acquired was $12.0 million, mostly comprised of amortizable customer relationships of $7.4 million and amortizable
tradenames of $2.8 million, resulting in $23.6 million of goodwill. All of the acquired goodwill is deductible for tax purposes.

56

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

STEEL CEILINGS

On August 16, 2018, we acquired the business and assets of Steel Ceilings. The $12.3 million purchase price was allocated to the
assets acquired and the liabilities assumed based on their estimated fair values, with the remaining amount recorded as goodwill. In
October 2018, we sold certain assets related to an acquired product line to WAVE for $2.0 million. The total fair value of tangible
assets acquired, less liabilities assumed, was $4.4 million. The total fair value of identifiable intangible assets acquired was mostly
comprised of amortizable customer relationships of $1.4 million and tradenames of $1.3 million, resulting in $3.2 million of goodwill.
All of the acquired goodwill is deductible for tax purposes.

PLASTERFORM

On May 31, 2018, we acquired the business and assets of Plasterform. The $11.9 million purchase price was allocated to the assets
acquired and the liabilities assumed based on their estimated fair values, with the remaining amount recorded as goodwill. The total
fair value of tangible assets acquired, less liabilities assumed, was $2.2 million. The total fair value of identifiable intangible assets
acquired, comprised of amortizable customer relationships, was $4.8 million, resulting in $4.9 million of goodwill. All of the acquired
goodwill is deductible for tax purposes.

PRO FORMA FINANCIAL INFORMATION

The following table summarizes aggregate audited as reported information and aggregate unaudited pro forma information assuming
the acquisitions of Arktura, Moz and Turf had occurred on January 1, 2018. The unaudited pro forma results include the depreciation
and amortization associated with the acquired assets, compensation expense related to cash payments and equity awards granted to
employees of the acquired companies and adjustments to revenue for the purchase accounting effects of recording deferred revenue at
fair value. In addition, the unaudited pro forma results do not include any expected benefits of the acquisitions. Accordingly, the
unaudited pro forma results are not necessarily indicative of either future results of operations or results that might have been achieved
had the acquisitions been consummated as of January 1, 2018.

Net sales from continuing operations, pro forma (unaudited)
Net sales from continuing operations, as reported
Net (loss) earnings from continuing operations, pro forma (unaudited)
Net (loss) earnings from continuing operations, as reported

Years Ended December 31,

$

2020

2019

2018

$

1,009.0
936.9
(69.2)
(84.1)

$

1,099.2
1,038.1
239.3
242.3

1,013.7
975.3
152.9
189.6

For the year ended December 31, 2020, net sales of $18.2 million and net earnings of $0.4 million from Arktura, Moz and Turf were
included in our Consolidated Statements of Operations and Comprehensive Income since the acquisition dates.

The 2019 and 2018 acquisitions, both individually and in the aggregate, did not have a material impact on reported net sales or net
earnings for the years ended December 31, 2019 and 2018.

NOTE 6. DISCONTINUED OPERATIONS

EMEA AND PACIFIC RIM BUSINESSES

On November 17, 2017, we agreed to sell certain subsidiaries comprising our businesses in EMEA and the Pacific Rim to Knauf. The
Sale was completed on September 30, 2019. Prior to completion of the Sale, each quarter, we compared the anticipated sales proceeds
from Knauf to the carrying value of EMEA and Pacific Rim net assets. We recorded an estimated loss when the carrying value
exceeded the anticipated sales proceeds. Net gains were only recorded to the extent of previous estimated losses.

We recorded an estimated loss on sale of $31.2 million and $19.3 million in 2019 and 2018, respectively. In 2020, we recorded a loss
of $17.2 million, primarily related to an $11.4 million purchase price adjustment related to certain pension liabilities included in the
Sale in addition to working capital and other adjustments.

See Note 1 for further discussion of the Sale.

57

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

FLOORING BUSINESSES

Separation and Distribution of AFI

On April 1, 2016, we completed our separation of Armstrong Flooring, Inc. (“AFI”) by allocating the assets and liabilities related
primarily to our Resilient and Wood Flooring segments to AFI and then distributing the common stock of AFI to our shareholders at a
ratio of one share of AFI common stock for every two shares of AWI common stock.

European Resilient Flooring

During 2020, we recorded a gain of $0.8 million related to Accumulated Other Comprehensive Income (“AOCI”) adjustments from a
previously discontinued foreign flooring entity, which was dissolved in the second quarter of 2020. The AOCI adjustments related to
accumulated foreign currency translation amounts.

Summarized Financial Information of Discontinued Operations

The following tables detail the businesses and line items that comprise discontinued operations on the Consolidated Statements of
Operations and Comprehensive Income.

EMEA and
Pacific Rim
Businesses

Flooring
Businesses

Total

2020
(Loss) gain from disposal of discontinued businesses, before income tax
Income tax (benefit)
(Loss) gain from disposal of discontinued businesses, net of tax

Net (loss) earnings from discontinued operations

2019
Net sales
Cost of goods sold
Gross profit
Selling, general and administrative expenses
Operating income
Other non-operating expense, net
Earnings from discontinued operations before income tax
Income tax expense
Net (loss) from discontinued operations, net of tax

(Loss) from disposal of discontinued businesses, before income tax
Income tax (benefit)
(Loss) gain from disposal of discontinued businesses, net of tax

Net (loss) earnings from discontinued operations

$

$

$

$

$

$

$

$

58

(17.2) $
(1.4)
(15.8) $

(15.8) $

EMEA and
Pacific Rim
Businesses

Flooring
Businesses

$

319.1
245.7
73.4
61.6
11.8
1.6
10.2
12.0
(1.8) $

(31.2) $
-
(31.2) $

(33.0) $

0.8
-
0.8

0.8

-
-
-
-
-
-
-
-
-

-
(5.2)
5.2

5.2

$

$

$

$

$

$

$

$

(16.4)
(1.4)
(15.0)

(15.0)

Total

319.1
245.7
73.4
61.6
11.8
1.6
10.2
12.0
(1.8)

(31.2)
(5.2)
(26.0)

(27.8)

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

2018
Net sales
Cost of goods sold
Gross profit
Selling, general and administrative expenses
Operating income
Interest expense
Other non-operating (income), net
Earnings from discontinued operations before income tax
Income tax expense
Net earnings from discontinued operations, net of tax

(Loss) from disposal of discontinued businesses, before income tax
Income tax (benefit)
(Loss) gain from disposal of discontinued businesses, net of tax

Net (loss) earnings from discontinued operations

EMEA and
Pacific Rim
Businesses

Flooring
Businesses

Total

$

$

$

$

$

446.1
341.4
104.7
85.8
18.9
1.4
(0.3)
17.8
8.2
9.6

$

$

(19.3) $
-
(19.3) $

(9.7) $

-
-
-
-
-
-
-
-
-
-

-
(6.0)
6.0

6.0

$

$

$

$

$

446.1
341.4
104.7
85.8
18.9
1.4
(0.3)
17.8
8.2
9.6

(19.3)
(6.0)
(13.3)

(3.7)

The following is a summary of total gains and losses, capital expenditures and operating lease information related to our former
EMEA and Pacific Rim businesses through the date of disposal, and gains on the dissolution of our previously discontinued flooring
entity, which are presented as discontinued operations and included as components of operating and investing cash flows on our
Consolidated Statements of Cash Flows:

Loss on sale to Knauf (1)
Estimated loss on sale to Knauf (2)
Gain on dissolution of flooring entity (3)
Purchases of property, plant and equipment
Operating lease cost (4)
ROU assets obtained in exchange for lease obligations (5)

$

2020

2019

2018

$

17.2
-
(0.8)
-
-
-

$

-
31.2
-
(3.0)
7.4
24.6

-
19.3
-
(7.3)
-
-

(1) Represents certain pension liabilities, working capital and other adjustments.
(2) Represents comparison of the EMEA and Pacific Rim net assets to the expected final sales proceeds.
(3) Represents AOCI adjustments related to accumulated foreign currency translation amounts.
(4) The amount of cash paid for amounts included in the measurement of lease liabilities was not materially different from the operating lease cost for the nine

months ended September 30, 2019.

(5) Represents initial ROU assets recognized upon adoption on January 1, 2019. We did not obtain any new ROU assets in exchange for lease obligations during

the nine months ended September 30, 2019.

NOTE 7. ACCOUNTS AND NOTES RECEIVABLE

Customer receivables
Miscellaneous receivables
Less allowance for warranties, discounts and losses
Accounts and notes receivable, net

December 31, 2020
77.9
$
4.0
(3.6)
78.3

$

December 31, 2019
82.4
$
5.0
(2.3)
85.1

$

We sell our products to select, pre-approved customers whose businesses are affected by changes in economic and market conditions.
We consider these factors and the financial condition of each customer when establishing our allowance for losses from doubtful
accounts.

59

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Miscellaneous receivables included proceeds from company-owned life insurance policies of $3.2 million and $0.8 million as of
December 31, 2020 and 2019, respectively. Miscellaneous receivables as of December 31, 2019 also included $2.5 million of amounts
due from Knauf related to our Transaction Services Agreement that were collected during 2020.

NOTE 8. INVENTORIES

Finished goods
Goods in process
Raw materials and supplies
Less LIFO reserves
Total inventories, net

December 31, 2020
44.6
$
5.5
42.3
(10.9)
81.5

$

December 31, 2019
40.2
$
4.0
35.0
(10.7)
68.5

$

Approximately 69% and 73% of our total inventory in 2020 and 2019, respectively, were valued on a Last-in, first-out (“LIFO”) basis.

The distinction between the use of different methods of inventory valuation is primarily based on type of inventory, legal entities
and/or geographical locations. The following table summarizes the amount of inventory that is not accounted for under the LIFO
method.

U.S. locations
Canada locations
Total

December 31, 2020
22.5
$
3.0
25.5

$

December 31, 2019
15.3
$
3.2
18.5

$

U.S. locations above generally use the weighted average cost method of inventory valuation and primarily represent certain finished
goods sourced from third party suppliers and certain entities within our Architectural Specialties segment, most notably recent
acquisitions, that also use the weighted average cost method given the nature of the inventory.

Our Canadian locations use the FIFO method of inventory valuation (or other methods which closely approximate the FIFO method)
primarily because the LIFO method is not permitted for local tax and/or statutory reporting purposes. In these situations, a conversion
to LIFO would be highly complex and involve excessive cost and effort to achieve under local tax and/or statutory reporting
requirements.

NOTE 9. OTHER CURRENT ASSETS

Prepaid expenses
Assets held for sale
Other
Total other current assets

December 31, 2020
12.0
$
-
0.8
12.8

$

December 31, 2019
7.5
$
6.6
1.4
15.5

$

As of December 31, 2019, assets held for sale included the property, plant and equipment of our idle mineral fiber plant in China,
which was sold in 2020.

60

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

NOTE 10. PROPERTY, PLANT AND EQUIPMENT

Land
Buildings
Machinery and equipment
Computer software
Construction in progress
Less accumulated depreciation and amortization
Net property, plant and equipment

NOTE 11. EQUITY INVESTMENTS

December 31, 2020
33.3
$
255.5
645.7
41.6
40.9
(487.1)
529.9

$

December 31, 2019
32.6
$
239.5
624.8
33.4
41.8
(447.5)
524.6

$

Investment in joint venture as of December 31, 2020 and 2019 reflected the equity interest in our 50% investment in our WAVE joint
venture. The WAVE joint venture is reflected within the Mineral Fiber segment in our consolidated financial statements using the
equity method of accounting.

We use the cumulative earnings approach to determine the appropriate classification of distributions from WAVE within our cash
flow statement. During 2020, 2019 and 2018, WAVE distributed amounts in excess of our capital contributions and proportionate
share of retained earnings. Accordingly, the distributions in these years were reflected as a return of investment in cash flows from
investing activity in our Consolidated Statement of Cash Flows. Distributions from WAVE in 2020, 2019 and 2018, were $81.5
million, $85.2 million, and $141.7 million, respectively.

In certain markets, we sell WAVE products directly to customers pursuant to specific terms of sale. In those circumstances, we record
the sales and associated costs within our consolidated financial statements. The total sales associated with these transactions were
$35.2 million, $33.5 million and $32.8 million for the years ended 2020, 2019 and 2018, respectively.

The European and Pacific Rim businesses of WAVE were included in the Sale to Knauf on September 30, 2019. Accordingly,
WAVE’s European and Pacific Rim historical financial statement results have been reflected in WAVE’s consolidated financial
statements as a discontinued operation for all periods presented. Our equity earnings in joint venture reflected as a component of
earnings from continuing operations included $3.0 million and $1.5 million of equity earnings representing WAVE’s net earnings
from operations of its discontinued European and Pacific Rim businesses in 2019 and 2018, respectively. Condensed financial data for
WAVE is summarized below on a continuing operations basis.

Current assets
Non-current assets
Current liabilities
Other non-current liabilities

Net sales
Gross profit
Net earnings

December 31, 2020
66.8
$
40.8
73.0
234.7

December 31, 2019
99.2
$
37.0
24.4
287.4

$

2020

2019

2018

$

343.3
194.7
137.8

$

393.2
219.6
166.0

375.0
205.8
156.6

In connection with the sale of WAVE’s European and Pacific Rim businesses and operations to Knauf on September 30, 2019, WAVE
recorded a $46.2 million gain on sale during 2019, which included $10.2 million of unfavorable AOCI adjustments. As such, during
2019, we recorded our share of WAVE’s gain on sale of discontinued operations of $20.6 million, which was included as a component
of Equity earnings from joint venture in our Consolidated Statements of Operations and Comprehensive Income.

61

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Our recorded investment in WAVE was higher than our 50% share of the carrying values reported in WAVE’s consolidated financial
statements by $141.1 million as of December 31, 2020 and $145.8 million as of December 31, 2019. These differences are due to our
adoption of fresh-start reporting upon emergence from Chapter 11 in October 2006, while WAVE’s consolidated financial statements
do not reflect fresh-start reporting. The differences are composed of the following fair value adjustments to assets:

Property, plant and equipment
Other intangibles
Goodwill
Total

December 31, 2020
$

December 31, 2019
$

0.4
110.3
30.4
141.1

$

$

0.4
115.0
30.4
145.8

Other intangibles include customer relationships, trademarks and developed technology. Customer relationships are amortized over
20 years and developed technology is amortized over 15 years. Trademarks have an indefinite life. During the third quarter of 2019,
we wrote off $4.4 million of customer relationships and developed technology intangible assets attributed to WAVE’s European and
Pacific Rim businesses included in the Sale. This write-off was included as a reduction to Equity earnings from joint venture in our
Consolidated Statements of Operations and Comprehensive Income.

Management regularly evaluates its investment in WAVE for impairment, including performing an evaluation as a result of the sale of
WAVE’s European and Pacific Rim businesses to Knauf. Based on those evaluations, management concluded that its investment in
WAVE was not impaired.

See discussion in Note 26 to the Consolidated Financial Statements for additional information on this related party.

NOTE 12. LEASES

The following table presents our lease costs:

Operating lease cost
Finance lease cost

Amortization of leased assets
Interest on lease liabilities
Total finance lease cost

Years Ended December 31,

2020

2019

$

$

$

5.6

2.0
0.6
2.6

$

$

$

6.8

-
-
-

Short-term lease expense and variable lease cost were not material for the years ended December 31, 2020 and 2019. Rent expense
was $6.1 million in 2018. As of December 31, 2020, we did not have any material leases that have not yet commenced.

The following table presents supplemental cash flow information related to our leases:

Cash paid for amounts included in the measurement of lease liabilities

Operating cash flows from operating leases
Operating cash flows from finance leases
Financing cash flows from finance leases

ROU assets obtained in exchange for lease liabilities

Operating leases (1)
Finance leases

Years Ended December 31,

2020

2019

$

$

$

$

5.4
0.6
1.8

5.4
2.6

6.8
-
-

41.6
-

(1) The year ended December 31, 2019 includes initial ROU assets of $29.2 million recognized upon adoption on January 1, 2019.

62

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

The following table presents the weighted average assumptions used to compute our ROU assets and lease liabilities:

Weighted average remaining lease term (in years)

Operating leases
Finance leases

Weighted average discount rate

Operating leases
Finance leases

December 31, 2020

December 31, 2019

6.5
10.7

4.0%
3.6%

8.6
-

4.4%
-

Undiscounted future minimum lease payments as of December 31, 2020, by year and in the aggregate, having non-cancelable lease
terms in excess of one year are as follows:

Maturity of lease liabilities
2021
2022
2023
2024
2025
Thereafter
Total lease payments
Less interest
Present value of lease liabilities

Operating Leases

Finance Leases

$

$

5.5
4.1
3.0
2.1
1.7
6.0
22.4
(3.0)
19.4

$

$

2.7
2.8
2.7
2.5
2.4
12.5
25.6
(4.8)
20.8

NOTE 13. GOODWILL AND INTANGIBLE ASSETS

We conduct our annual impairment testing of goodwill and non-amortizing intangible assets during the fourth quarter. The 2020,
2019 and 2018 reviews concluded that no impairment charges were necessary. See Note 2 to the Consolidated Financial Statements
for a discussion of our accounting policy for goodwill and intangible assets.

The following table details amounts related to our goodwill and intangible assets as of December 31, 2020 and 2019:

Amortizing intangible assets
Customer relationships
Developed technology
Software
Trademarks and brand names
Non-compete agreements
Other
Total
Non-amortizing intangible assets
Trademarks and brand names
Total intangible assets

Goodwill

December 31, 2020

December 31, 2019

Gross
Carrying
Amount

Accumulated
Amortization

Gross
Carrying
Amount

Accumulated
Amortization

$

$

114.9
72.1
-
0.6
-
0.1
187.7

$

$

128.9
77.9
-
1.3
0.4
0.2
208.7

200.6
92.1
9.1
4.0
6.3
6.9
319.0

347.2
666.2

160.7

$

$

$

$

188.9
85.0
-
3.9
0.2
0.1
278.1

321.5
599.6

53.0

Estimated
Useful Life

1-20 years
13-19 years
7 years
5-10 years
3-5 years
Various

Indefinite

Indefinite

$

$

$

$

63

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

The increase in goodwill as of December 31, 2020 resulted from the acquisitions of Arktura, Moz and Turf and foreign exchange
movements. See Note 5 to the Consolidated Financial Statements for additional details.

Amortization expense

2020

2019

2018

$

22.1

$

19.9

$

15.1

The expected annual amortization expense for the years 2021 through 2025 are as follows:

2021
2022
2023
2024
2025

NOTE 14. OTHER NON-CURRENT ASSETS

Cash surrender value of company-owned life insurance policies
Investment in employee deferred compensation plans
Fair value of derivative assets
Other
Total other non-current assets

NOTE 15. ACCOUNTS PAYABLE AND ACCRUED EXPENSES

Payables, trade and other
Employment costs
Current portion of pension and postretirement liabilities
Payable to Knauf for purchase price adjustments
Payable to WAVE for receipt of Knauf proceeds
Other
Total accounts payable and accrued expenses

NOTE 16. INCOME TAXES

$

34.0
16.4
13.7
13.2
12.6

December 31, 2020
47.8
$
9.6
-
0.3
57.7

$

December 31, 2019
53.5
$
2.8
1.3
0.3
57.9

$

December 31, 2020
81.3
$
17.6
9.5
11.4
-
16.7
136.5

$

December 31, 2019
79.4
$
16.5
10.5
1.2
25.9
10.0
143.5

$

The tax effects of principal temporary differences between the carrying amounts of assets and liabilities and their tax basis are
summarized below. Management believes it is more likely than not that the results of future operations will generate sufficient taxable
income in the appropriate jurisdiction to realize deferred tax assets, net of valuation allowances. In arriving at this conclusion, we
considered the profit before tax, excluding the impact of the pension settlement, generated for the years 2018 through 2020, future
reversals of existing taxable temporary differences, and projections of future profit before tax.

We reduce the carrying amounts of deferred tax assets by a valuation allowance if, based on the available evidence, it is more likely
than not that such assets will not be realized. The need to establish valuation allowances for deferred tax assets is assessed quarterly.
In assessing the requirement for, and amount of, a valuation allowance in accordance with the more likely than not standard for all
periods, we consider all positive and negative evidence related to the realization of the deferred tax assets. This assessment considers,
among other matters, the nature, frequency and severity of current and cumulative losses, forecasts of future profitability, the duration
of statutory carryforward periods, and our experience with operating loss and tax credit carryforward expirations. A history of
cumulative losses is a significant piece of negative evidence used in our assessment. If a history of cumulative losses is incurred for a
tax jurisdiction, forecasts of future profitability are not used as positive evidence related to the realization of the deferred tax assets in
the assessment.

64

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

As of December 31, 2020 and 2019, we had $806.9 million and $897.3 million, respectively, of gross state net operating loss (“NOL”)
carryforwards expiring between 2021 and 2040. As of December 31, 2020, we had foreign tax credits (“FTC”) carryforwards of $17.7
million that expire between 2021 and 2022. U.S. FTC carryforwards as of December 31, 2019 were $13.1 million. As of December
31, 2020, we had capital loss carryforwards of $19.3 million that expire between 2024 and 2035. Capital loss carryforwards as of
December 31, 2019 were $16.0 million.

As of December 31, 2020 and 2019, we had valuation allowances of $79.4 million and $75.5 million, respectively. As of
December 31, 2020, our valuation allowance consisted of $17.7 million for federal deferred tax assets related to FTC carryforwards,
$42.4 million for state deferred tax assets related to operating loss carryforwards, and $19.3 million for federal and state deferred tax
assets related to capital loss carryovers.

We estimate we will need to generate future federal taxable foreign source income of $84.4 million to fully realize FTC carryforwards
before they expire in 2022. We estimate we will need to generate future taxable income of approximately $612.3 million for state
income tax purposes during the respective realization periods (ranging from 2021 to 2040) to be able to fully realize the net deferred
income tax assets discussed above. We estimate we will need to generate capital gain income of $67.4 million to fully realize our
federal capital loss carryforwards before they expire in 2024 and 2025. We estimate we will need to generate capital gain income of
$191.6 million to fully realize our state capital loss carryforwards before they expire between 2024 and 2035. Our ability to utilize
deferred tax assets may be impacted by certain future events, such as changes in tax legislation or insufficient future taxable income
prior to expiration of certain deferred tax assets.

Deferred income tax assets (liabilities)

Net operating losses
Postretirement benefits
Pension benefit liabilities
Deferred compensation
Foreign tax credit carryforwards
State tax credit carryforwards
Capital loss carryforwards
Lease right-of-use liabilities
Other

Total deferred income tax assets
Valuation allowances
Net deferred income tax assets

Intangibles
Partnerships and investments
Accumulated depreciation
Prepaid pension costs
Inventories
Lease right-of-use assets
Other

Total deferred income tax liabilities
Net deferred income tax liabilities
Deferred income taxes have been classified in the Consolidated Balance

Sheet as:

Deferred income tax assets - non-current
Deferred income tax liabilities - non-current
Net deferred income tax liabilities

65

December 31, 2020

December 31, 2019

$

$

$

$

48.7
22.0
12.0
9.0
17.7
8.9
19.3
10.0
16.2
163.8
(79.4)
84.4
(93.7)
(28.1)
(75.5)
(30.7)
(4.4)
(10.2)
(0.2)
(242.8)
(158.4)

-
(158.4)
(158.4)

$

$

$

$

54.8
21.2
12.9
10.5
13.1
9.3
16.0
9.0
9.0
155.8
(75.5)
80.3
(96.6)
(29.6)
(69.7)
(24.2)
(4.5)
(9.0)
(0.2)
(233.8)
(153.5)

10.4
(163.9)
(153.5)

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Details of taxes
(Loss) earnings from continuing operations before income taxes

Domestic
Foreign

Total

Income tax expense (benefit):
Current:

Federal
Foreign
State
Total current

Deferred:

Federal
Foreign
State
Total deferred

2020

2019

2018

$

$

$

$

$

$

(130.0) $
3.3
(126.7) $

299.7
(0.3)
299.4

$

40.8
1.0
5.6
47.4

(75.5)
-
(14.5)
(90.0)

31.4
0.8
6.3
38.5

15.1
(0.3)
3.8
18.6

234.0
8.7
242.7

45.7
2.1
8.0
55.8

(3.7)
-
1.0
(2.7)

Total income tax (benefit) expense

$

(42.6) $

57.1

$

53.1

We reviewed our position with regards to foreign unremitted earnings and determined that unremitted earnings will not be
permanently reinvested as a result of the Sale. Accordingly, in 2020, we recorded foreign withholding taxes of $0.9 million on
approximately $17.9 million of net undistributed earnings of foreign subsidiaries. In 2019, we recorded foreign withholding taxes of
$0.8 million on approximately $14.0 million of net undistributed earnings of foreign subsidiaries.

Reconciliation to U.S. statutory tax rate
Continuing operations tax (benefit) expense at statutory rate
Increase in valuation allowances on deferred

domestic income tax assets

State income tax (benefit) expense, net of federal impact
Capital loss on sale of investment
Statute closures
State deferred tax adjustments
Capital loss utilization on WAVE earnings
2017 Tax Act (1)
Excess tax benefits on share-based compensation
Tax on foreign and foreign source income
U.S. permanent differences
Other
Tax (benefit) expense at effective rate

2020

2019

2018

$

(26.6) $

62.9

$

(0.1)
(7.3)
(4.6)
(1.3)
(1.5)
-
-
(0.9)
-
(2.2)
1.9

$

(42.6) $

0.1
12.4
-
(3.8)
(1.9)
(4.4)
-
(3.2)
(1.9)
(1.8)
(1.3)
57.1

$

51.0

10.0
9.2
-
(9.6)
-
-
(1.2)
(3.8)
(4.4)
(1.6)
3.5
53.1

(1) On December 22, 2017, the U.S. federal government enacted the 2017 Tax Act, resulting in significant changes from existing U.S. tax laws that impact us,
including, but not limited to, reducing the U.S. federal corporate income tax rate from 35% to 21%, allowing immediate 100% deduction for the cost of
qualified property, eliminating the domestic production activities deduction, and imposing a one-time transition tax in 2017 on the cumulative earnings and
profits of certain foreign subsidiaries that were previously not repatriated and therefore not taxed for U.S. income tax purposes. Our federal income tax
expense is based on the new 21% rate for periods beginning in 2018.

We recognize the tax benefits of an uncertain tax position only if those benefits are more likely than not to be sustained based on
existing tax law. Additionally, we establish a reserve for tax positions that are more likely than not to be sustained based on existing
tax law, but uncertain in the ultimate benefit to be sustained upon examination by the relevant taxing authorities. Unrecognized tax
benefits are subsequently recognized at the time the more likely than not recognition threshold is met, the tax matter is effectively

66

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

settled or the statute of limitations for the relevant taxing authority to examine and challenge the tax position has expired, whichever is
earlier.

We have $41.7 million of Unrecognized Tax Benefits (“UTB”) as of December 31, 2020, $18.4 million ($17.4 million, net of federal
benefit) of this amount, if recognized in future periods, would impact the reported effective tax rate.

It is reasonably possible that certain UTB’s may increase or decrease within the next twelve months due to tax examination changes,
settlement activities, expirations of statute of limitations, or the impact on recognition and measurement considerations related to the
results of published tax cases or other similar activities. Over the next twelve months we estimate that UTB’s may decrease by $0.2
million related to state statutes expiring and increase by $1.5 million due to uncertain tax positions expected to be taken on domestic
tax returns.

We account for all interest and penalties on uncertain income tax positions as income tax expense. We have $2.9 million of interest
and penalties accrued in non-current income tax payable in the Consolidated Balance Sheet as of December 31, 2020.

We had the following activity for UTB’s for the years ended December 31, 2020, 2019 and 2018:

Unrecognized tax benefits balance at January 1,
Gross change for current year positions
Increases for prior period positions
Decrease for prior period positions
Decrease due to statute expirations
Unrecognized tax benefits balance at December 31,

2020

2019

2018

$

$

34.7
2.3
8.7
-
(4.0)
41.7

$

$

42.6
2.2
-
(2.1)
(8.0)
34.7

$

$

53.4
3.6
1.1
(2.0)
(13.5)
42.6

We file income tax returns in the U.S. and various states and international jurisdictions. In the normal course of business, we are
subject to examination by taxing authorities in Canada and the United States. Generally, we have open tax years subject to tax audit
on average of between three years and six years. The statute of limitations is no longer open for U.S. federal returns before 2016.
With few exceptions, the statute of limitations is no longer open for state or non-U.S. income tax examinations for the years before
2014. With the exception of extending the 2016 statute of limitations to May 31, 2022 as a result of an ongoing Federal audit, we have
not significantly extended any open statutes of limitation for any major jurisdiction and have reviewed and accrued for, where
necessary, tax liabilities for open periods.

Other taxes
Payroll taxes
Property, franchise and capital stock taxes

NOTE 17. DEBT

Revolving credit facility due 2024
Term loan A due 2024
Principal debt outstanding
Unamortized debt financing costs
Long-term debt
Less current portion
Total long-term debt, less current portion

2020

2019

2018

$

$

15.6
4.2

$

16.0
3.8

15.6
3.7

December 31, 2020
225.0
$
493.7
718.7
(3.2)
715.5
25.0
690.5

$

December 31, 2019
115.0
$
500.0
615.0
(4.2)
610.8
6.3
604.5

$

We have a $1,000.0 million variable rate senior credit facility, which is comprised of a $500.0 million revolving credit facility (with a
$150.0 million sublimit for letters of credit) and a $500.0 million Term Loan A. The revolving credit facility and Term Loan A are
currently priced at 1.50% over LIBOR. The senior credit facility also has a $25.0 million letter of credit facility, also known as our bi-
lateral facility. The revolving credit facility and Term Loan A mature in September 2024.

67

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

On September 30, 2019, we refinanced our senior credit facility. In connection with the refinancing, we paid $3.0 million of bank,
legal and other fees, of which $2.9 million were capitalized. These fees are reflected as a component of long-term debt and amortized
into interest expense over the terms of the underlying debt. Additionally, we wrote off $2.7 million of unamortized debt financing
costs, included as a component of interest expense, related to our previous credit facility. Finally, in connection with the refinancing,
we settled a $100.0 million notional interest rate swap as of September 30, 2019. See Note 20 for additional details.

The senior credit facility includes two financial covenants that require the ratio of consolidated EBITDA to consolidated cash interest
expense minus cash consolidated interest income to be greater than or equal to 3.0 to 1.0 and requires the ratio of consolidated funded
indebtedness, minus AWI and domestic subsidiary unrestricted cash and cash equivalents up to $100 million, to EBITDA to be less
than or equal to 3.75 to 1.0. As of December 31, 2020, we were in compliance with all covenants of the senior credit facility.

Our debt agreements include other restrictions, including restrictions pertaining to the incurrence of additional debt, the redemption,
repurchase or retirement of our capital stock, payment of dividends, and certain financial transactions as it relates to specified assets.
We currently believe that default under these covenants is unlikely.

During 2020, we borrowed and subsequently repaid $30.0 million under our Accounts Receivable Securitization Facility with the
Bank of Nova Scotia (the “funding entity”) which matured in September 2020. Interest on borrowings under this amended facility was
calculated at a 90-day commercial paper rate. Under this facility, we sold accounts receivables to Armstrong Receivables Company,
LLC (“ARC”), a Delaware entity that is consolidated in these financial statements. ARC is a 100% wholly owned single member
LLC special purpose entity created specifically for this transaction; therefore, any receivables sold to ARC were not available to the
general creditors of AWI. ARC used this facility to borrow cash or issue letters of credit. When ARC borrowed cash under this
facility, ARC sold an undivided percentage ownership interest in the purchased accounts receivables to the funding entity. We had the
unilateral right to repurchase the funding entity’s purchased interest in the accounts receivables and, as a result, borrowings under this
facility were reported as debt in the Consolidated Balance Sheets. Borrowings under this facility were obligations of ARC and not
AWI. ARC contracted with and paid a servicing fee to AWI to manage, collect and service the purchased accounts receivables. All
new receivables under the program were continuously purchased by ARC with the proceeds from collections of receivables previously
purchased.

None of our remaining outstanding debt as of December 31, 2020 was secured with buildings and other assets. The credit lines under
our revolving credit facility are subject to immaterial annual commitment fees.

Scheduled payments of long-term debt:

2021
2022
2023
2024
2025
2026 and later

$

25.0
25.0
25.0
643.7
-
-

We utilize lines of credit and other commercial commitments in order to ensure that adequate funds are available to meet operating
requirements. Letters of credit are currently arranged through our revolving credit facility and our bi-lateral facility. Letters of credit
may be issued to third party suppliers, insurance and financial institutions and typically can only be drawn upon in the event of AWI’s
failure to pay its obligations to the beneficiary. The following table presents details related to our letters of credit facilities:

Financing Arrangements
Bi-lateral facility
Revolving credit facility
Total

Limit

December 31, 2020
Used

Available

$

$

25.0
150.0
175.0

$

$

10.9
-
10.9

$

$

14.1
150.0
164.1

68

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

NOTE 18. PENSION AND OTHER BENEFIT PROGRAMS

DEFINED CONTRIBUTION BENEFIT PLANS

We sponsor several defined contribution plans, which cover substantially all U.S. and non-U.S. employees. Eligible employees may
defer a portion of their pre-tax covered compensation on an annual basis. We match employee contributions up to pre-defined
percentages. Employee contributions are 100% vested. Employer contributions are vested based on pre-defined requirements. Costs
for defined contribution benefit plans were $8.1 million in 2020, $7.7 million in 2019 and $6.3 million in 2018.

DEFINED BENEFIT PENSION PLANS

Benefits from defined benefit pension plans are based primarily on an employee's compensation and years of service. We fund our
pension plans when appropriate.

Our U.S. defined benefit pension plans include both the qualified, funded RIP and the Retirement Benefit Equity Plan (“RBEP”),
which is a nonqualified, unfunded plan designed to provide pension benefits in excess of the limits defined under Sections 415 and
401(a)(17) of the Internal Revenue Code.

During February 2020, we entered into agreements with Athene Annuity and Life Company (“AAIA”) and Athene Annuity & Life
Assurance Company of New York (“AANY”) to transfer certain benefit obligations and assets of our U.S. Retirement Income Plan
(“RIP”) to AAIA and AANY. Under the agreements, we effectively settled $1,045.3 million of retiree defined benefit pension
obligations related to approximately 10,300 retirees and beneficiaries (the “Transferred Participants”), which were irrevocably
transferred to AAIA and AANY and which guarantees the pension benefits of the Transferred Participants. During the third quarter of
2020, these amounts were immaterially adjusted due to customary data reconciliations with AAIA and AANY. The Agreement did not
impact our benefit obligations under the RBEP.

As a result of the transaction, we recorded a $374.4 million settlement loss in the first quarter of 2020, which represented the release
of amounts previously recorded in AOCI to other non-operating expense. The RIP’s assets and liabilities were remeasured as of the
settlement date, resulting in a remaining projected benefit obligation of $387.5 million, which covered approximately 3,000 deferred
vested and active participants, and fair value of plan assets of $499.6 million. The discount rate used to determine the projected benefit
obligation at the settlement date was 3.07%, compared to 3.16% used as of December 31, 2019. The expected long-term return on plan
assets remained at 5.25% and did not change as a result of the settlement.

During the third quarter of 2020, we offered an early retirement incentive benefit to employees at one of our manufacturing plants who
met certain age and years of service criteria. The consideration period for eligible employees ended on September 30, 2020. Based on
eligible employee elections to participate, we recorded a charge of $2.0 million within other non-operating expense, which increased
the projected benefit obligation of the RIP. The enhanced retirement benefits did not result in a curtailment.

We have a defined benefit pension plan in Germany which was not acquired by Knauf in connection with the Sale. This plan uses
assumptions which are consistent with, but not identical to, those of the U.S. plans. The accumulated benefit obligation for the non-
U.S. defined benefit pension plan was $2.9 million and $2.8 million as of December 31, 2020 and 2019, respectively.

The following tables summarize the balance sheet impact of our U.S. defined benefit pension plans, as well as the related benefit
obligations, assets, funded status and rate assumptions. We use a December 31 measurement date for all our defined benefit pension
plans.

Change in benefit obligations:
Benefit obligations as of beginning of period
Service cost
Interest cost
Settlement payments
Special termination benefits
Actuarial loss
Benefits paid
Benefit obligations as of end of period

69

2020

2019

$

$

1,431.4
5.5
15.5
(1,006.3)
2.0
31.2
(37.6)
441.7

$

$

1,359.7
4.8
50.3
-
-
117.0
(100.4)
1,431.4

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Change in plan assets:
Fair value of plan assets as of beginning of period
Actual return on plan assets
Employer contributions
Settlement payments
Benefits paid
Fair value of plan assets as of end of period
Funded status

Weighted-average assumptions used to determine benefit

obligations at end of period:

Discount rate
Rate of compensation increase

Weighted-average assumptions used to determine net periodic

benefit cost for the period:

Discount rate
Expected return on plan assets
Rate of compensation increase

Basis of Rate-of-Return Assumption

2020

2019

$

$
$

1,478.4
83.1
3.1
(1,006.3)
(37.6)
520.7
79.0

$

$
$

2020

2019

2.68%
3.05%

3.07%
5.25%
3.05%

1,360.4
214.4
4.0
-
(100.4)
1,478.4
47.0

3.16%
3.05%

4.28%
5.75%
3.05%

Long-term asset class return assumptions for the RIP are determined based on input from investment professionals on the expected
performance of the asset classes over 10 to 30 years. The forecasts were averaged to come up with consensus passive return forecasts
for each asset class. Incremental components were added for the expected return from active management and asset class rebalancing
based on historical information obtained from investment consultants. These forecasted gross returns were reduced by estimated
management fees and expenses, yielding a long-term return forecast of 5.25% and 5.75% for the years ended December 31, 2020 and
2019, respectively.

The accumulated benefit obligation for the U.S. defined benefit pension plans was $439.6 million and $1,429.5 million as of
December 31, 2020 and 2019, respectively. The largest contributor to the net actuarial losses affecting the benefit obligations for the
defined benefit pension plans was a decrease in the discount rates, partially offset by the annuity premium gain in the RIP, an
experience gain in the RBEP and other changes in assumptions.

Pension plans with benefit obligations in excess of assets
RBEP Projected benefit obligation, December 31
RBEP Accumulated benefit obligation, December 31

2020

2019

$

$

40.5
40.5

47.8
47.8

The components of the pension cost (credit) for the U.S. defined benefit pension plans are as follows:

Service cost of benefits earned during the period
Interest cost on projected benefit obligation
Expected return on plan assets
Recognized net actuarial loss
Settlement
Special termination benefits
Net periodic pension cost (credit)

2020

2019

2018

$

$

5.5
15.5
(34.5)
6.3
374.4
2.0
369.2

$

$

$

4.8
50.3
(80.1)
19.2
-
-
(5.8) $

5.7
46.1
(95.9)
20.0
-
-
(24.1)

For 2020, 2019 and 2018, actuarial gains and losses were amortized over the remaining life expectancy of plan participants, which
was approximately 28 years for 2020, 17 years for 2019 and 18 years for 2018 for our U.S. defined benefit pension plans.

70

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Investment Policies

U.S. Pension Plans

The RIP’s primary investment objective is to maintain the funded status of the plan such that the likelihood that we will be required to
make significant contributions to the plan is limited. This objective is expected to be achieved by (a) investing a substantial portion of
the plan assets in high quality corporate bonds whose duration is at least equal to that of the plan’s liabilities, (b) investing in publicly
traded equities in order to increase the ratio of plan assets to liabilities over time, (c) limiting investment return volatility by
diversifying among additional asset classes with differing expected rates of return and return correlations, and (d) using derivatives to
either implement investment positions efficiently or to hedge risk but not to create investment leverage.

Each asset class utilized by the RIP has defined asset allocation targets and allowable ranges. The table below shows the asset
allocation targets and the December 31, 2020 and 2019 positions for each asset class:

Asset Class
Long duration bonds
Equities, real estate and private equity
Other

Target

Weight at
December 31,

Position at December 31,

2020

2020 (1)

2019 (1)

90.0%
10.0%

89.0%
11.0%

69.0%
30.0%
1.0%

(1)

Investments in collective trust funds as of December 31, 2020 and 2019 have been categorized within the asset classes above
based on the underlying investments in those funds.

Pension plan assets are required to be reported and disclosed at fair value. Fair value is defined as the exchange price that would be
received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability
in an orderly transaction between market participants on the measurement date. Three levels of inputs may be used to measure fair
value:

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities
in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that
are observable or can be corroborated by observable market data.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the
assets or liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use
significant unobservable inputs.

The asset’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to
the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of
unobservable inputs.

The following table sets forth by level within the fair value hierarchy a summary of the RIP plan assets measured at fair value on a
recurring basis:

Description
Bonds
Collective trust fund
Cash, other short-term investments and payables, net
Net assets measured at fair value
Investments measured at net asset value
Net assets

Level 1

Value at December 31, 2020
Level 3
Level 2

Total

$

$

-
-
(0.3)
(0.3)

$

$

460.9
51.4
0.9
513.2

$

$

-
-
-
-

$

$

$

460.9
51.4
0.6
512.9
7.8
520.7

71

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Description
Bonds
Collective trust fund
Other investments
Cash, other short-term investments and payables, net
Net assets measured at fair value
Investments measured at net asset value
Net assets

$

$

Level 1

Value at December 31, 2019
Level 3
Level 2

-
-
-
0.3
0.3

$

$

1,017.7
434.6
-
12.6
1,464.9

$

$

-
-
2.5
-
2.5

$

$

$

Total

1,017.7
434.6
2.5
12.9
1,467.7
10.7
1,478.4

The RIP has investments in alternative investment funds as of December 31, 2020 and 2019 which are reported at fair value. These
investments that are measured at fair value using the net asset value (“NAV”) per share (or its equivalent) practical expedient have not
been categorized in the fair value hierarchy. The fair value amounts presented in the tables above are intended to permit reconciliation
of the fair value hierarchy to the total fair value of plan assets. We have concluded that the NAV reported by the underlying fund
approximates the fair value of the investment. These investments are redeemable at NAV under agreements with the underlying
funds. However, it is possible that these redemption rights may be restricted or eliminated by the funds in the future in accordance
with the underlying fund agreements. Due to the nature of the investments held by the funds, changes in market conditions and the
economic environment may significantly impact the NAV of the funds and, consequently, the fair value of the U.S. defined benefit
pension plan asset’s interest in the funds. Furthermore, changes to the liquidity provisions of the funds may significantly impact the
fair value of the U.S. defined benefit pension plan asset’s interest in the funds. As of December 31, 2020, there were no restrictions
on redemption of these investments.

The following table sets forth a summary of the RIP’s investments measured at NAV:

Description
Real estate

Description
Real estate

Value at December 31, 2020

Fair Value

Unfunded
Commitments

7.8

$

2.2

Redemption
Frequency
Quarterly

Value at December 31, 2019

Fair Value

Unfunded
Commitments

10.7

$

2.2

Redemption
Frequency
Quarterly

$

$

Redemption
Notice
Period
60 days

Redemption
Notice
Period
60 days

Following is a description of the valuation methodologies used for assets measured at fair value and at NAV.

Bonds: Consists of registered investment funds and common and collective trust funds investing in fixed income securities tailored to
institutional investors. There are no readily available market quotations for registered investment company funds. The fair value of
investment funds and common and collective trust funds have been classified as Level 2 assets above as their values were derived
based on the underlying securities in the fund’s portfolio which is typically the amount which the fund might reasonably expect to
receive for the security upon a current sale. Investments in pooled funds traded in a non-active market were valued at bid price and
classified as Level 2 assets above.

Collective trust fund: Represents collective trust and funds holding equity investments, fixed income securities, commodity futures
contracts, cash and other short-term securities. The fair value of collective trust funds have been classified as Level 2 assets above as
their values were derived based on the underlying securities in the fund’s portfolio which is typically the amount which the fund might
reasonably expect to receive for the security upon a current sale.

Real estate: Consists of both open-end and closed-end funds. There are no readily available market quotations for these real estate
funds. These investments were measured at fair value using the NAV practical expedient.

72

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Other investments: Consisted of investments in a group insurance annuity contract. Investments in the group insurance annuity
contract were classified as Level 3 assets and measured at fair value by discounting the related cash flows based on current yields of
similar instruments with comparable durations while considering the creditworthiness of the issuer.

Cash, other short-term investments and payables: Consists primarily of cash and cash equivalents, and plan receivables/payables.
The carrying amounts of cash and cash equivalents and receivables/payables approximate fair value due to the short-term nature of
these instruments. Other payables and receivables consist primarily of accrued fees and receivables related to investment positions
liquidated for which proceeds had not been received as of December 31.

U.S. DEFINED BENEFIT RETIREE HEALTH AND LIFE INSURANCE PLANS

We fund postretirement benefits on a pay-as-you-go basis, with the retiree paying a portion of the cost for health care benefits by
means of deductibles and contributions.

The following tables summarize the balance sheet impact of the U.S. postretirement benefit pension plan, as well as the related benefit
obligations, funded status and rate assumptions. We use a December 31 measurement date for all our defined benefit postretirement
benefit plans.

Change in benefit obligations:
Benefit obligation as of beginning of period
Service cost
Interest cost
Plan participants' contributions
Plan amendments
Actuarial loss
Benefits paid
Benefit obligations as of end of period

Change in plan assets:
Fair value of plan assets as of beginning of period
Employer contributions
Plan participants' contributions
Benefits paid
Fair value of plan assets as of end of period
Funded status

2020

2019

77.5
-
1.9
1.9
-
8.2
(8.1)
81.4

$

$

2020

2019

$

-
6.2
1.9
(8.1)
-
$
(81.4) $

$

$

$

$
$

Weighted-average discount rate used to determine benefit obligations at end of period
Weighted-average discount rate used to determine net periodic benefit cost for the period

2.37%
3.14%

2020

2019

65.4
0.1
2.4
2.0
(1.1)
18.1
(9.4)
77.5

-
7.4
2.0
(9.4)
-
(77.5)

3.14%
4.31%

The largest contributors to the actuarial losses affecting the benefit obligations for the postretirement plans were the decreases in the
discount rates and the updates to the per capita claims assumptions.

The components of postretirement benefit (credit) are as follows:

Service cost of benefits earned during the period
Interest cost on accumulated postretirement benefit obligation
Amortization of prior service (credit)
Amortization of net actuarial gain
Net periodic postretirement benefit (credit)

2020

2019

2018

$

$

$

-
1.9
(0.3)
(6.6)
(5.0) $

$

0.1
2.4
(0.2)
(8.5)
(6.2) $

0.2
2.6
(0.1)
(5.7)
(3.0)

73

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

For measurement purposes, an average rate of annual increase in the per capita cost of covered health care benefits of 6.7% for pre-65
retirees and 7.6% for post-65 retirees was assumed for 2020, decreasing ratably to an ultimate rate of 4.5% in 2027.

Amounts recognized in assets (liabilities) on the consolidated balance sheets at year end consist of:

Prepaid pension costs
Accounts payable and accrued expenses
Postretirement benefit liabilities
Pension benefit liabilities
Net amount recognized

U.S. Pension Plans

Non-U.S. Pension Plan

Retiree Health and Life
Insurance Benefits

2020

2019

2020

2019

2020

2019

$

$

119.5
(2.9)
-
(37.6)
79.0

$

$

94.8
(3.9)
-
(43.9)
47.0

$

$

$

-
(0.1)
-
(2.8)
(2.9) $

$

-
(0.1)
-
(2.7)
(2.8) $

$

-
(6.5)
(74.9)
-
(81.4) $

-
(6.5)
(71.0)
-
(77.5)

Pre-tax amounts recognized in accumulated other comprehensive (loss) income at year end consist of:

Net actuarial (loss) gain
Prior service credit
Accumulated other comprehensive (loss)

income

U.S. Pension Plans

Retiree Health and Life
Insurance Benefits

2020

2019

2020

2019

(142.6) $
-

(540.7) $
-

$

17.9
1.7

(142.6) $

(540.7) $

19.6

$

32.8
2.0

34.8

$

$

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid over the next ten years
for our U.S. plans:

2021
2022
2023
2024
2025
2026 - 2030

U.S. Pension
Benefits (1)

Retiree Health
and Life
Insurance
Benefits, Net

$

$

12.0
15.0
17.0
19.0
20.2
114.0

6.5
6.4
6.2
5.8
5.6
23.6

(1) We were not required and did not make contributions to the RIP during 2020, 2019 or 2018 as, based on guidelines established
by the Pension Benefit Guaranty Corporation, the RIP had sufficient assets to fund its distribution obligations. Benefit
payments to RIP participants have been made directly from the RIP while benefit payments under the RBEP are made from
Company cash.

74

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

NOTE 19. FINANCIAL INSTRUMENTS AND CONTINGENT CONSIDERATION

We do not hold or issue financial instruments for trading purposes. The estimated fair values of our financial instruments are as
follows:

(Liabilities), net:

Total long-term debt, including current portion
Interest rate swap contracts
Acquisition-related contingent consideration

December 31, 2020

December 31, 2019

Carrying
amount

Estimated
fair value

Carrying
amount

Estimated
fair value

$

(715.5) $
(28.9)
(16.9)

(715.5) $
(28.9)
(16.9)

(610.8) $
(14.3)
-

(610.8)
(14.3)
-

The carrying amounts of cash and cash equivalents, receivables, accounts payable, and accrued expenses approximate fair value
because of the short-term maturity of these instruments. The fair value estimates of long-term debt are based on quotes from a major
financial institution of recently observed trading levels of our Term Loan A debt. The fair value estimates for interest rate swap
contracts are estimated by obtaining quotes from major financial institutions with verification by internal valuation models. We
engage independent, third-party valuation specialists to determine the fair value estimates for contingent consideration, which are
based on a Monte Carlo simulation.

The fair value measurement of liabilities measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets
is summarized below:

December 31, 2020
Fair value based on

December 31, 2019
Fair value based on

Other
observable
inputs
Level 2

Other
unobservable
inputs
Level 3

Other
observable
inputs
Level 2

Other
unobservable
inputs
Level 3

(Liabilities), net:

Interest rate swap contracts
Acquisition-related contingent consideration

$

(28.9) $
-

$

-
(16.9)

(14.3) $
-

-
-

The contingent consideration liability represents estimated future contingent purchase price payments related to the Moz and Turf
acquisitions. The significant unobservable inputs used in the fair value measurement of the contingent consideration liability include
the financial projections over the earn-out period, the volatility of the underlying financial metrics and estimated discount rates.

The following table summarizes the weighted-average of the significant unobservable inputs as of December 31, 2020:

Unobservable input

Volatility
Discount rates

Moz

Turf

25.8%
2.8%

26.2%
2.8%

Unobservable inputs were weighted based on the relative fair value of the components of contingent consideration. See Note 5 for
further information.

75

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

The changes in fair value of the acquisition-related contingent consideration liability for the year ended December 31, 2020 were as
follows:

Balance as of beginning of period
Acquisition date fair value of Moz contingent consideration
Acquisition date fair value of Turf contingent consideration
Adjustments to fair value measurements
Balance as of end of period

NOTE 20. DERIVATIVE FINANCIAL INSTRUMENTS

$

$

2020

-
2.7
14.1
0.1
16.9

We are exposed to market risk from changes in foreign exchange rates, interest rates and commodity prices that could impact our
results of operations, cash flows and financial condition. We use swaps to hedge interest rate exposures. At inception, interest rate
swap derivatives that we designate as hedging instruments are formally documented as a hedge of a forecasted transaction or “cash
flow” hedge. We also formally assess, both at inception and at least quarterly thereafter, whether the derivatives that are used in
hedging transactions are highly effective in offsetting changes in the cash flows of the hedged item. If it is determined that a
derivative ceases to be a highly effective hedge, or if the anticipated transaction is no longer probable of occurring, we discontinue
hedge accounting and any future mark-to-market adjustments are recognized in earnings. We use derivative financial instruments as
risk management tools and not for speculative trading purposes.

Counterparty Risk

We only enter into derivative transactions with established financial institution counterparties having an investment-grade credit
rating. We monitor counterparty credit default swap levels and credit ratings on a regular basis. All of our derivative transactions
with counterparties are governed by master International Swap and Derivatives Association agreements (“ISDAs”) with netting
arrangements. These agreements can limit our exposure in situations where we have gain and loss positions outstanding with a single
counterparty. We do not post nor do we receive cash collateral with any counterparty for our derivative transactions. These ISDAs do
not have any credit contingent features; however, a default under our bank credit facility would trigger a default under these
agreements. Exposure to individual counterparties is controlled and we consider the risk of counterparty default to be negligible.

Commodity Price Risk

We purchase natural gas and other various commodities for use in the manufacturing process. Although we are exposed to
fluctuations in commodity pricing, we currently have no outstanding positions and do not expect to enter into any commodity
derivative products.

Currency Rate Risk – Sales and Purchases

As of December 31, 2020, our only major foreign currency exposure is to the Canadian dollar. We currently have no outstanding
positions and do not expect to enter into any foreign exchange derivative products.

76

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Interest Rate Risk

We utilize interest rate swaps to minimize the fluctuations in earnings caused by interest rate volatility. These swaps are designated as
cash flow hedges against changes in LIBOR for a portion of our variable rate debt. The following table summarizes our interest rate
swaps as of December 31, 2020:

Trade Date
November 14, 2016
November 28, 2018
November 28, 2018
March 6, 2020
March 10, 2020
March 11, 2020

$
$
$
$
$
$

Notional
Amount

200.0
200.0
100.0
50.0
50.0
50.0

Coverage Period
December 2016 to March 2021
November 2018 to November 2023
March 2021 to March 2025
March 2020 to March 2022
March 2021 to March 2024
March 2021 to March 2024

Risk Coverage
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR
USD-LIBOR

Under the terms of the November 2016 swap maturing in 2021, we receive 3-month LIBOR and pay a fixed rate over the hedged
period, in addition to a basis rate swap to convert the floating rate risk under our November 2016 swap from 3-month LIBOR to 1-
month LIBOR. As a result, we receive 1-month LIBOR and pay a fixed rate over the hedged period.

Under the terms of the November 2018 swap maturing in 2023, we pay a fixed rate over the hedged amount and receive 1-month
LIBOR. This is inclusive of a 0% floor.

Under the terms of the forward starting November 2018 swap maturing in 2025, we will pay a fixed rate monthly and receive 1-month
LIBOR. This is inclusive of a 0% floor.

Under the terms of the March 2020 swap maturing in 2022, we pay a fixed rate over the hedged amount and receive 1-month LIBOR.
This is inclusive of a 0% floor.

Under the terms of the forward starting March 2020 swaps maturing in 2024, we will pay a fixed rate monthly and receive 1-month
LIBOR. These are inclusive of a 0% floor.

In connection with the refinancing of our credit facility in September 2019, we settled a $100.0 million notional interest rate swap.

Financial Statement Impacts

The following tables detail amounts related to our derivatives as of December 31, 2020 and 2019. We did not have any derivative
assets or liabilities not designated as hedging instruments for the years ended December 31, 2020 and 2019. The derivative asset and
liability amounts below are shown in gross amounts and have not been netted.

Derivative Assets

Fair Value

Balance Sheet
Location

December 31,
2020

December 31,
2019

Interest rate swap contracts

Interest rate swap contracts

Other current
assets
Other non-current
assets

$

$

-

-

-

1.3

Derivative Liabilities

Balance Sheet
Location
Accounts payable
and accrued
expenses
Other long-term
liabilities

Fair Value

December 31,
2020

December 31,
2019

$

0.5

$

28.4

-

15.6

77

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Amount of Gain (Loss)
Recognized in AOCI
2019

2018

2020

Location of Gain (Loss)
Reclassified from
AOCI into Net Earnings
(Loss)

Gain (Loss) Reclassified
from AOCI into Net Earnings (Loss)
2019

2020

2018

Derivatives in cash flow hedging
relationships
Natural gas commodity contracts
Foreign exchange contracts –
purchases
Foreign exchange contracts – sales
Interest rate swap contracts
Total

$

$

-

$

-

$

0.7

Cost of goods sold

$

-

$

-

$

0.1

-
-
(8.6)
(8.6) $ (20.0) $

-
-
(20.0)

0.1
0.7
(2.0)
(0.5)

Cost of goods sold
Net sales
Interest expense
Total gain (loss)

$

-
-
5.6
5.6

$

-
-
(1.4)
(1.4) $

-
-
(1.6)
(1.5)

As of December 31, 2020, the amount of existing losses in AOCI expected to be recognized in earnings over the next twelve months is
$8.4 million.

NOTE 21. OTHER LONG-TERM LIABILITIES

Fair value of derivative liabilities
Acquisition-related contingent consideration
Long-term deferred compensation arrangements
Environmental insurance recoveries received in excess of cumulative expenses incurred
Other
Total other long-term liabilities

December 31, 2020
28.4
$
16.9
14.8
5.0
11.4
76.5

$

December 31, 2019
15.6
$
-
14.0
-
8.2
37.8

$

NOTE 22. SHARE-BASED COMPENSATION PLANS

The 2016 Long-Term Incentive Plan (“2016 LTIP”) authorizes us to issue stock options, stock appreciation rights, restricted stock
awards, stock units, performance-based awards and cash awards to officers and key employees and expires on July 8, 2026, after
which time no further awards may be made. The 2016 LTIP authorizes us to issue up to 2,803,242 shares of common stock, which
includes all shares that have been issued under the 2016 LTIP. As of December 31, 2020, 2,183,904 shares were available for future
grants under the 2016 LTIP, excluding any future adjustments to shares for performance-based awards that have been previously
granted.

The 2016 Directors Stock Unit Plan (“2016 Director’s Plan”) authorizes us to issue stock units to non-employee directors until July
2026. The 2016 Director’s Plan authorizes us to issue up to 250,000 shares of common stock, which includes all shares that have been
issued under the 2016 Director’s Plan. As of December 31, 2020, 167,218 shares were available for future grants under the 2016
Director’s Plan.

The 2020 Inducement Award Plan (“2020 Inducement Plan”) authorizes us to issue stock options, stock appreciation rights, restricted
stock awards and stock units to key employees and expires on December 14, 2030, after which time no further awards may be made.
The 2020 Inducement Plan authorizes us to issue up to 19,000 shares of common stock. As of December 31, 2020, 513 shares were
available for future grants under the 2020 Inducement Plan.

78

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

The following table presents stock option activity for the year ended December 31, 2020:

Option shares outstanding, December 31, 2019
Option shares exercised
Option shares outstanding, December 31, 2020
Option shares exercisable, vested and expected to vest,

December 31, 2020

Number of
shares
(thousands)

Weighted-
average
exercise price
40.84
261.1
$
(39.02)
(121.5) $
42.41
$
139.6

139.6

$

42.41

Weighted-
average
remaining
contractual
term (years)

Aggregate
intrinsic value
(millions)

1.9

1.9

$

$

4.5

4.5

We have reserved sufficient authorized shares to allow us to issue new shares upon exercise of all outstanding options. Options
generally become exercisable in three years and expire 10 years from the date of grant. When options are exercised, we may issue
new shares, use treasury shares (if available), acquire shares held by investors, or a combination of these alternatives in order to satisfy
the option exercises.

The following table presents information related to stock option exercises:

Total intrinsic value of stock options exercised
Cash proceeds received from stock options exercised
Tax deduction realized from stock options exercised

$

2020

2019

2018

$

5.6
4.7
1.2

$

15.9
14.5
3.3

23.7
18.4
6.1

The fair value of option grants was estimated on the date of grant using the Black-Scholes option pricing model. There have been no
option grants since 2014.

We also grant non-vested stock awards in the form of Restricted Stock Units (“RSUs”) and Performance Stock Units (“PSUs”). A
summary of the 2020 activity related to the RSUs and PSUs is as follows:

December 31, 2019

Granted
Performance adjustments
Vested
Forfeited

December 31, 2020

Non-Vested Stock Awards

RSUs

PSUs

Number of shares
(thousands)

Weighted-
average fair value
at grant date

Number of shares
(thousands)

Weighted-
average fair value
at grant date

65.4
38.6
-
(34.0)
(3.2)
66.8

$

$

66.49
86.16
-
(54.69)
(81.83)
83.14

357.7
99.3
158.3
(280.5)
(4.5)
330.3

$

$

58.27
99.57
43.74
(44.08)
(73.95)
75.49

RSUs entitle the recipient to a specified number of shares of AWI’s common stock provided the prescribed service period is fulfilled.
PSUs entitle the recipient to a specified number of shares of AWI’s common stock provided the defined financial targets are achieved
at the end of the performance period. Upon vesting, final adjustments based upon financial achievements are reflected as performance
adjustments in the table above. RSUs and PSUs generally have vesting periods of three years at the grant date. RSUs and PSUs earn
dividends during the vesting period that are subject to forfeiture if the awards do not vest.

The table above includes 895 PSUs as of December 31, 2020 and 2019, which are accounted for as liability awards as they are able to
be settled in cash. Employee liability awards outstanding for all periods represent awards to certain employees of our former EMEA
and Pacific Rim businesses, which vest when the appropriate performance period ends. These awards will be distributed in the second
quarter of 2021.

RSUs and PSUs with non-market based performance conditions are measured at fair value based on the closing price of our stock on
the date of grant. In 2020 and 2019, we granted 42,698 and 58,430 PSUs, respectively, with market-based performance conditions

79

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

that are valued through the use of a Monte Carlo simulation. The weighted average assumptions for PSUs measured at fair value
through the use of a Monte Carlo simulation are presented in the table below.

Weighted-average grant date fair value of market-based PSUs granted (dollars per award) $
Assumptions
Risk-free rate of return
Expected volatility
Expected term (in years)
Expected dividend yield

2020

2019

97.75

$

77.80

1.2%
23.8%
3.1
0.0%

2.4%
25.9%
3.1
0.0%

The risk-free rate of return was determined based on the implied yield available on zero coupon U.S. Treasury bills at the time of grant
with a remaining term equal to the expected term of the PSUs. In 2019, the expected volatility was based on an average of the actual
historical volatilities of the stock prices of AWI and a peer group of companies. We elected to not rely solely on AWI’s actual
historical stock price volatility due to the separation of AFI in 2016. In 2020, the expected volatility was based on the actual historical
volatilities of the stock prices of AWI. The expected term represented the performance period on the underlying award. The expected
dividend yield was assumed to be zero under the assumption that dividends distributed during the performance period are reinvested in
AWI’s common stock.

In connection with our recent acquisition of Arktura, we issued 75,743 shares of restricted stock to the sellers as of the acquisition
date, which are not reflected in the non-vested stock awards table above. These awards to sellers were not issued under the 2020
Inducement Plan and have a vesting period of five years from the grant date and earn dividends during the vesting period, which are
subject to forfeiture if the awards do not vest. We also issued 18,487 Restricted Stock Awards (“RSAs”) under the 2020 Inducement
Plan to key employees as of the acquisition date, which are not reflected in the non-vested stock awards table above. These key
employee awards have a vesting period of three years from the grant date and earn dividends during the vesting period, which are
subject to forfeiture if the awards do not vest. If forfeited, the key employee awards will transfer to the Arktura sellers. We reissued
treasury shares to grant all of the restricted stock and RSAs associated with the Arktura acquisition.

In addition to the equity awards described above, as of December 31, 2020 we had 11,773 fully-vested phantom shares outstanding for
non-employee directors under the 2006 Phantom Stock Unit Plan not reflected in the non-vested stock awards table above. These
awards are settled in cash and had vesting periods of one to three years. The awards are generally payable six months following the
director’s separation from service on the Board of Directors. The total liability recorded for these shares as of December 31, 2020 was
$1.2 million which includes associated non-forfeitable dividends. This liability was settled on January 5, 2021. The 2006 Phantom
Stock Unit Plan is still in place; however, no additional shares will be granted under the plan.

As of December 31, 2020 and 2019, there were 126,474 and 140,417 RSUs, respectively, outstanding under the 2016 Directors Stock
Unit Plan not reflected in the non-vested stock awards table above. In 2020 and 2019, we granted 12,278 and 9,981 restricted stock
units, respectively, to non-employee directors. These awards generally have a vesting period of one year, and as of December 31,
2020 and 2019, 114,196 and 130,436 shares, respectively, were vested but not yet delivered. The awards are generally payable upon
vesting or the director’s deferral election. These awards earn dividends during the vesting period that are subject to forfeiture if the
underlying award does not vest.

We recognize share-based compensation expense on a straight-line basis over the vesting period. Share-based compensation cost was
$6.9 million ($5.1 million net of tax benefit) in 2020, $8.4 million ($6.3 million net of tax benefit) in 2019, and $12.9 million ($9.6
million net of tax benefit) in 2018.

As of December 31, 2020, there was $17.0 million of total unrecognized compensation cost related to non-vested share-based
compensation arrangements. That cost is expected to be recognized over a weighted-average period of 3.1 years.

80

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

NOTE 23. EMPLOYEE COSTS

Wages, salaries and incentive compensation
Payroll taxes
Defined contribution and defined benefit pension plan expense (credit), net
Insurance and other benefit costs
Share-based compensation
Total

$

$

207.6
15.6
1.0
25.1
6.9
256.2

$

$

201.8
16.0
2.0
21.9
8.4
250.1

$

$

197.2
15.6
(17.8)
22.3
12.9
230.2

2020

2019

2018

NOTE 24. SHAREHOLDERS' EQUITY

Common Stock Repurchase Plan

Since July 29, 2016, our Board of Directors has approved our share repurchase program pursuant to which we are currently authorized
to repurchase up to $1,200.0 million of our outstanding shares of common stock through December 31, 2023 (the “Program”). The
Program was temporarily suspended in the first quarter of 2020 in response to uncertainties surrounding COVID-19. On October 21,
2020, we elected to restart the Program and had $593.8 million remaining under the Board’s repurchase authorization as of December
31, 2020.

Repurchases under the Program may be made through open market, block and privately-negotiated transactions, including Rule 10b5-
1 plans, at such times and in such amounts as management deems appropriate, subject to market and business conditions, regulatory
requirements and other factors. The Program does not obligate AWI to repurchase any particular amount of common stock and may
be suspended or discontinued at any time without notice.

During 2020, we repurchased 0.5 million shares under the Program for a total cost of $44.4 million, excluding commissions, or an
average price of $87.27 per share. Since inception, we have repurchased 9.7 million shares under the Program for a total cost of
$606.2 million, excluding commissions, or an average price of $62.35 per share.

Dividends

In February, April and July 2020, our Board of Directors declared $0.20 per share quarterly dividends, which were paid to
shareholders in March, May and August 2020, respectively. In October 2020, our Board of Directors declared a $0.21 per share
quarterly dividend, which was paid to shareholders in November 2020. On February 17, 2021, our Board of Directors declared a $0.21
per share quarterly dividend to be paid in March 2021.

Accumulated Other Comprehensive (Loss)

The balance of each component of accumulated other comprehensive (loss), net of tax is presented in the table below.

Foreign currency translation adjustments
Derivative (loss), net
Pension and postretirement adjustments
Accumulated other comprehensive (loss)

December 31, 2020
2.3
$
(19.0)
(92.6)
(109.3)

$

$

$

December 31, 2019

9.4
(8.5)
(377.0)
(376.1)

81

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

The amounts and related tax effects allocated to each component of other comprehensive income for 2020, 2019, and 2018 are
presented in the tables below.

2020
Foreign currency translation adjustments
Derivative (loss), net
Pension and postretirement adjustments
Total other comprehensive income (loss)

2019
Foreign currency translation adjustments
Derivative (loss), net
Pension and postretirement adjustments
Total other comprehensive income

2018
Foreign currency translation adjustments
Derivative gain, net
Pension and postretirement adjustments
Total other comprehensive (loss) income

Pre-tax Amount

Tax Benefit
(Expense)

After-tax Amount

$

$

(7.1) $
(14.2)
382.9
361.6

$

$

-
3.7
(98.5)
(94.8) $

(7.1)
(10.5)
284.4
266.8

Pre-tax Amount

Tax Benefit
(Expense)

After-tax Amount

$

$

84.1
(18.8)
16.8
82.1

$

$

-
4.9
(3.6)
1.3

$

$

84.1
(13.9)
13.2
83.4

Pre-tax Amount

Tax Benefit

After-tax Amount

$

$

(27.6) $
0.9
(41.6)
(68.3) $

-
0.2
8.7
8.9

$

$

(27.6)
1.1
(32.9)
(59.4)

The following table summarizes the activity, by component, related to the change in AOCI for December 31, 2020 and 2019:

Foreign
Currency
Translation
Adjustments

Derivative
Gain (Loss) (1)
5.3
0.1

(74.7) $
-

Pension and
Postretirement
Adjustments (1)
$

(390.2) $
-

Total
Accumulated
Other
Comprehensive
(Loss) (1)

3.9

80.2
84.1
9.4

(0.2)

(6.9)
(7.1)
2.3

(15.0)

1.1
(13.9)
(8.5)

(6.1)

1.4

11.8
13.2
(377.0)

6.1

(4.4)
(10.5)
(19.0) $

278.3
284.4
(92.6) $

$

(459.6)
0.1

(9.7)

93.1
83.4
(376.1)

(0.2)

267.0
266.8
(109.3)

Balance, December 31, 2018
Impact of ASU 2017-12 adoption
Other comprehensive income (loss) before reclassifications,
net of tax benefit (expense) of $ -, $5.2, ($1.4) and $3.8

Amounts reclassified from accumulated other

comprehensive (loss)

Net current period other comprehensive income (loss)
Balance, December 31, 2019
Other comprehensive (loss) income before reclassifications,
net of tax benefit (expense) of $ -, $2.5, ($3.0) and ($0.5)

Amounts reclassified from accumulated other

comprehensive (loss)

Net current period other comprehensive (loss) income
Balance, December 31, 2020

(1) Amounts are net of tax

$

$

82

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

The amounts reclassified from AOCI and the affected line item of the Consolidated Statement of Operations and Comprehensive
Income are presented in the table below.

Derivative Adjustments:

Interest rate swap contracts
Tax impact
Total (income) loss, net of tax

Pension and Postretirement Adjustments:

Prior service credit amortization

Amortization of net actuarial loss

Settlement
Total loss, before tax
Tax impact
Total loss from continuing operations, net of tax
Adjustments related to Sale to Knauf (1)
Total loss, net of tax

Foreign Currency Translation Adjustments:

Sale to Knauf (1)
Sale of idled plant in China
Total (income) loss, net of tax
Total reclassifications for the period

Affected Line Item in the
Consolidated
Statement of Operations
and Comprehensive
Income

Interest expense
Income tax expense

Other non-operating expense
(income), net
Other non-operating expense
(income), net
Other non-operating expense
(income), net

Income tax expense

Amounts
Reclassified from
Accumulated Other
Comprehensive
(Loss)

2020

2019

$

$

(5.6) $
1.2
(4.4)

(0.3)

(0.3)

374.4
373.8
(95.5)
278.3
-
278.3

-
(6.9)
(6.9)
267.0

$

1.4
(0.3)
1.1

(0.2)

10.7

-
10.5
(2.2)
8.3
3.5
11.8

80.2
-
80.2
93.1

(1) Represents amounts reclassified out of Accumulated other comprehensive loss during 2019 related to the Sale and included as a component of (loss) gain
from disposal of discontinued operations on the Consolidated Statements of Operations and Comprehensive Income. A portion of these amounts were
included in our previously reported estimated loss on sale. See Note 6 for additional details.

NOTE 25. SUPPLEMENTAL FINANCIAL INFORMATION

Selected operating expense
Maintenance and repair costs
Research and development costs
Advertising costs

Other non-operating expense (income), net
Interest income
Pension and postretirement cost (credits)
Other
Total

2020

2019

2018

$

$

$

$

38.1
14.7
6.8

(0.3) $

358.7
(1.0)
357.4

$

$

41.4
14.8
7.0

(3.2) $
(16.9)
(0.3)
(20.4) $

41.6
16.3
6.5

(4.3)
(33.0)
4.8
(32.5)

83

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

NOTE 26. RELATED PARTIES

In some geographies and for some customers, we purchase grid products from WAVE, our 50%-owned joint venture with
Worthington, for resale to customers. The total amount of these purchases was $21.5 million in 2020, $22.5 million in 2019 and $22.5
million in 2018. We also provide certain selling, promotional and administrative processing services to WAVE for which we receive
reimbursement. Those services amounted to $20.7 million in 2020, $15.7 million in 2019, and $15.8 million in 2018. The net amount
due to WAVE from us for all of our relationships was $4.9 million as of December 31, 2020 and $3.3 million as of December 31,
2019. As of December 31, 2019, we also recorded a $25.9 million payable to WAVE for their remaining portion of the proceeds from
the Sale, which was reflected within Accounts payable and accrued expenses in the December 31, 2019 Consolidated Balance Sheet
and paid to WAVE during 2020. See Note 11 to the Consolidated Financial Statements for additional information.

NOTE 27. LITIGATION AND RELATED MATTERS

ENVIRONMENTAL MATTERS

Environmental Compliance

Our manufacturing and research facilities are affected by various federal, state and local requirements relating to the discharge of
materials and the protection of the environment. We make expenditures necessary for compliance with applicable environmental
requirements at each of our operating facilities. While these expenditures are not typically material, the applicable regulatory
requirements continually change and, as a result, we cannot predict with certainty the amount, nature or timing of future expenditures
associated with environmental compliance.

Environmental Sites

Summary

We are actively involved in the investigation and remediation of existing or potential environmental contamination under the
Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”) and state Superfund and similar
environmental laws at two domestically owned locations allegedly resulting from past industrial activity.

In each location, we are one of multiple potentially responsible parties and have agreed to jointly fund the required investigation and
remediation, while preserving our defenses to the liability. We may also have rights of contribution or reimbursement from other
parties or coverage under applicable insurance policies. We are currently pursuing coverage and recoveries under those policies with
respect to certain of the sites, including the Macon, GA site and the Elizabeth City, NC site, each of which is summarized below.
These efforts have included two active and independent litigation matters against legacy primary and excess policy insurance carriers
for recovery of fees and costs incurred by us in connection with our investigation and remediation activities for such sites. As
described below, the litigation matter in Oregon relating to the St. Helens, OR site was dismissed in the second quarter of 2019 in
connection with our settlement with the State of Oregon. Other than disclosed below, we are unable to predict the outcome of these
matters or the timing of any recoveries, whether through settlement or otherwise. We are also unable to predict the extent to which
any recoveries might cover our final share of investigation and remediation costs for these sites. Our final share of investigation and
remediation costs may exceed any such recoveries, and such amounts net of insurance recoveries may be material.

Between 2017 and 2019, we entered settlement agreements totaling $39.8 million with certain legacy insurance carriers to resolve
ongoing litigation and recover fees and costs previously incurred by us in connection with certain environmental sites. These
settlements were recorded as a $9.2 million reduction to cost of goods sold and a $30.6 million reduction to SG&A expenses reflecting
the same income statement categories where environmental expenditures were historically recorded. In 2020, we entered into
settlement agreements totaling $12.7 million, $7.7 million of which was recorded as a reduction to SG&A expenses. During the fourth
quarter of 2020, cumulative insurance recoveries exceeded cumulative expenses to date related to the respective environmental sites
and the excess $5.0 million was recorded within our long-term liabilities as of December 31,2020. The excess recoveries will be
released to offset any future expenses incurred on the respective environmental sites. We anticipate that we may enter into additional
settlement agreements in the future, which may or may not be material, with other legacy insurers to obtain reimbursement or
contribution for environmental site expenses.

Estimates of our future liability at the environmental sites are based on evaluations of currently available facts regarding each
individual site. We consider factors such as our activities associated with the site, existing technology, presently enacted laws and
regulations and prior company experience in remediating contaminated sites. Although current law imposes joint and several liability
on all parties at Superfund sites, our contribution to the remediation of these sites is expected to be limited by the number of other
companies potentially liable for site remediation. As a result, our estimated liability reflects only our expected share. In determining

84

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

the probability of contribution, we consider the solvency of other parties, the site activities of other parties, whether liability is being
disputed, the terms of any existing agreements and experience with similar matters, and the effect of our October 2006 Chapter 11
reorganization upon the validity of the claim, if any.

Specific Material Events

St Helens, OR

In August 2010, we entered into a Consent Order (the “Consent Order”) with the Oregon Department of Environmental Quality
(“ODEQ”), along with Kaiser Gypsum Company, Inc. (“Kaiser”), and Owens Corning Sales LLC (“OC”), with respect to our St.
Helens, Oregon facility, which was previously owned by Kaiser and then OC. The Consent Order required the parties to complete a
remedial investigation and feasibility study on the upland, lowland and in-water portions of the site.

Through voluntary mediation in November 2017 with ODEQ, OC and Kaiser, we reached settlement with ODEQ documented in a
Public Notice and proposed consent judgment (“Consent Judgment”); in exchange for a release from ODEQ for all contamination
claims against us, we would pay $8.6 million to the State of Oregon and perform a previously scoped remedial action for the upland
area. We submitted the settlement payment to ODEQ and completed the remedial action for the upland area in 2019.

ODEQ approved a final Upland Operable Unit Remedial Action Construction Completion and Final Closeout Report and issued a
Conditional No Further Action Determination, including the Easement and Equitable Servitude, which was recorded in Columbia
County, Oregon. On February 24, 2020, ODEQ filed the Certification of Completion for the satisfactory completion of the work
conducted by us pursuant to the Consent Judgment. As a result of the settlements with ODEQ and Kaiser, and these actions by
ODEQ, we do not expect to incur any future material costs relating to this matter.

Macon, GA

The U.S. Environmental Protection Agency (the “EPA”) has listed two landfills located on a portion of our facility in Macon, GA,
along with the former Macon Naval Ordnance Plant landfill adjacent to our property, portions of Rocky Creek, and certain tributaries
leading to Rocky Creek (collectively, the “Macon Site”) as a Superfund site on the National Priorities List due to the presence of
contaminants, most notably polychlorinated biphenyls (“PCBs”).

In September 2010, we entered into an Administrative Order on Consent for a Removal Action (the “Removal Action”) with the EPA
to investigate PCB contamination in one of the landfills on our property, the Wastewater Treatment Plant Landfill (the “WWTP
Landfill,” also known as “Operable Unit 1”). After completing an investigation of the WWTP Landfill and submitting our final
Engineering Evaluation/Cost Analysis, the EPA issued an Action Memorandum in July 2013 selecting our recommended remedy for
the Removal Action. The Operable Unit 1 response action for the WWTP Landfill is complete and the final report was submitted to
the EPA on October 11, 2016. The EPA approved the final report on November 28, 2016, and a Post-Removal Control Plan (the
“Plan”) was submitted to the EPA on March 28, 2017. That Plan will monitor the effectiveness of the WWTP Landfill response action
over a five-year period and our estimate of future liabilities includes these tasks.

It is probable that we will incur field investigation, engineering and oversight costs associated with a remedial investigation and
feasibility study (“RI/FS”) with respect to the remainder of the Superfund site, which includes the other landfill on our property, as
well as areas on and adjacent to our property and Rocky Creek (the “Remaining Site,” also known as “Operable Unit 2”). On
September 25, 2015, AWI and other Potential Responsible Parties (“PRPs”) received a Special Notice Letter from the EPA under
CERCLA inviting AWI and the PRPs to enter into the negotiation of an agreement to conduct an RI/FS of Operable Unit 2. We and
the other PRPs entered into a settlement agreement with the EPA effective September 18, 2018, in response to the Special Notice
Letter to conduct the RI/FS. The PRPs submitted a complete RI/FS work plan in the second quarter of 2019, which the EPA approved
on September 11, 2019. Investigative work on this portion of the site commenced in December 2019. Ecological field work and risk
evaluation remains ongoing. We anticipate that the EPA will require significant investigative work for Operable Unit 2. We may
ultimately incur costs in remediating any contamination discovered during the RI/FS. The current estimate of future liability at this
site includes only our estimated share of the costs of the investigative work that, at this time, we anticipate the EPA will require the
PRPs to perform. We are unable to reasonably estimate our final share of the total costs associated with the investigation work or any
resulting remediation therefrom, although such amounts may be material to any one quarter's or year's results of operations in the
future. However, we do not expect the total future costs to have a material adverse effect on our liquidity or financial condition as the
cash payments may be made over many years.

85

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

Elizabeth City, NC

This site is a former cabinet manufacturing facility that was operated by Triangle Pacific Corporation, now known as Armstrong
Wood Products, Inc. (“Triangle Pacific” or “AWP”), from 1977 until 1996. The site was formerly owned by the U.S. Navy (“Navy”)
and Westinghouse, now CBS Corporation (“CBS”). We assumed ownership of the site when we acquired the stock of Triangle
Pacific in 1998. Prior to our acquisition, the North Carolina Department of Environment and Natural Resources listed the site as a
hazardous waste site. In 1997, Triangle Pacific entered into a cost sharing agreement with Westinghouse whereby the parties agreed
to share equally in costs associated with investigation and potential remediation. In 2000, Triangle Pacific and CBS entered into an
Administrative Order on Consent to conduct an RI/FS with the EPA for the site. In 2007, we and CBS entered into an agreement with
the Navy whereby the Navy agreed to pay one third of defined past and future investigative costs up to a certain amount, which has
now been exhausted. The EPA approved the RI/FS work plan in August 2011. In January 2014, we submitted the draft Remedial
Investigation and Risk Assessment reports and conducted supplemental investigative work based upon agency comments to those
reports. In connection with the separation of AFI in 2016, we agreed to retain any legacy environmental liabilities associated with the
AWP site. The EPA published an Interim Action Proposed Plan for the site in April 2018 seeking public comment through June 7,
2018. The EPA evaluated comments, including ours, and has published its Interim Record Of Decision selecting an interim cleanup
approach. On September 25, 2018, AWI and CBS received a Special Notice Letter from the EPA under CERCLA inviting AWI and
CBS to enter into the negotiation of a settlement agreement to conduct or finance the response action at the site. During the third
quarter of 2018, we increased our reserve for the cost of the interim cleanup, which we expect to be shared with CBS and the Navy.
In response to the September 2018 Special Notice Letter, AWI and CBS submitted a good faith offer to EPA on May 28, 2019, and
negotiations among parties remain ongoing. The current estimate of future liability at this site includes only our estimated share of the
costs of the interim remedial action that, at this time, we anticipate the EPA will require the PRPs to perform. We are unable to
reasonably estimate our final share of the total costs associated with the final remediation or any resulting remediation therefrom,
although such amounts may be material to any one quarter's or year's results of operations in the future. However, we do not expect
the total future costs to have a material adverse effect on our liquidity or financial condition as the cash payments may be made over
many years.

Summary of Financial Position

Total liabilities of $1.2 million as of December 31, 2020 and $1.6 million as of December 31, 2019 were recorded for environmental
liabilities that we consider probable and for which a reasonable estimate of the probable liability could be made. As of December 31,
2020 and 2019, $0.3 million and $0.1 million, respectively, were reflected within accounts payable and accrued expenses. During
2020, we did not record any additional reserves for potential environmental liabilities. During 2019, we recorded reserves for
potential environmental liabilities of $1.0 million. Where existing data is sufficient to estimate the liability, that estimate has been
used; where only a range of probable liabilities is available and no amount within that range is more likely than any other, the lower
end of the range has been used. As assessments and remediation activities progress at each site, these liabilities are reviewed to reflect
new information as it becomes available and adjusted to reflect amounts actually incurred and paid. These liabilities are
undiscounted.

The estimated environmental liabilities above do not take into account any claims for additional recoveries from insurance or third
parties. It is our policy to record insurance recoveries as assets in the Consolidated Balance Sheets when probable. We incur costs to
pursue environmental insurance recoveries, which are expensed as incurred.

Actual costs to be incurred at identified sites may vary from our estimates. Based on our knowledge of the identified sites, it is not
possible to reasonably estimate future costs in excess of amounts already recognized.

OTHER CLAIMS

On September 8, 2017, Roxul USA, Inc. (d/b/a Rockfon) (“Rockfon”) filed litigation against us in the United States District Court for
the District of Delaware (the “Court”) alleging anticompetitive conduct seeking remedial measures and unspecified damages. Roxul
USA, Inc. is a significant ceilings systems competitor with global headquarters in Europe and expanding operations in the Americas.
On April 3, 2019, we entered into a confidential settlement agreement with Rockfon to fully resolve the litigation between us, and
Rockfon filed a Stipulation of Dismissal with Prejudice (“Dismissal”) with the Court. Pursuant to the Dismissal, Rockfon formally
dismissed all claims it had against AWI with prejudice. All claims in the litigation have been fully and finally dismissed and released
with AWI making a payment to Rockfon for its costs, expenses and attorneys’ fees. Pursuant to the settlement, both parties
acknowledged that (a) AWI denies all claims of wrongdoing and makes no admission of wrongdoing or of the truth of any of the
claims or allegations contained in Rockfon’s complaint or otherwise alleged in the litigation; (b) all AWI exclusive distribution
locations (i.e., any location where a reseller has agreed to sell only AWI ceiling system products) will remain exclusive to AWI under
their respective distribution agreements, and (c) in all other non-exclusive or “open” distribution locations, resellers are free to

86

Armstrong World Industries, Inc., and Subsidiaries
Notes to Consolidated Financial Statements
(dollar amounts in millions, except share data)

purchase and resell ceiling systems products of any manufacturer at their discretion. During the first six months of 2019, we incurred
$19.7 million of expenses in connection with the matter, primarily relating to legal and professional fees incurred by us in connection
with the litigation, including expenses and attorney’s fees paid under the settlement agreement. As a result of the settlement and
Dismissal, we do not expect to incur additional future costs or expenses relating to the matter.

From time to time, we are involved in other various lawsuits, claims, investigations and other legal matters that arise in the ordinary
course of business, including matters involving our products, intellectual property, relationships with suppliers, relationships with
distributors, relationships with competitors, employees and other matters. In connection with those matters, we may have rights of
contribution or reimbursement from other parties or coverage under applicable insurance policies. When applicable and appropriate,
we will pursue coverage and recoveries under those policies, but are unable to predict the outcome of those demands. While complete
assurance cannot be given to the outcome of any proceedings relating to these matters, we do not believe that any current claims,
individually or in the aggregate, will have a material adverse effect on our financial condition, liquidity or results of operations.

NOTE 28. EARNINGS PER SHARE

Earnings per share components may not add due to rounding.

The following table is a reconciliation of (loss) earnings to (loss) earnings attributable to common shares used in our basic and diluted
(Loss) Earnings Per Share (“EPS”) calculations for the years ended December 31, 2020, 2019 and 2018. EPS components may not add
due to rounding.

(Loss) earnings from continuing operations
(Earnings) allocated to participating vested share awards
(Loss) earnings from continuing operations attributable to common shares

$

$

2020

2019

2018

(84.1) $
(0.1)
(84.2) $

242.3
(0.5)
241.8

$

$

189.6
(0.6)
189.0

The following table is a reconciliation of basic shares outstanding to diluted shares outstanding for the years ended December 31,
2020, 2019 and 2018 (shares in millions):

Basic shares outstanding
Dilutive effect of common stock equivalents
Diluted shares outstanding

2020

2019

2018

47.9
-
47.9

48.7
0.8
49.5

51.3
0.8
52.1

Due to the net loss for the year ended December 31, 2020, all common stock equivalents were considered anti-dilutive. Anti-dilutive
options excluded from the computation of dilutive EPS for 2020 and 2019 were 313,003 and 7,580, respectively. There were no anti-
dilutive stock options excluded from the computation of diluted EPS in 2018.

87

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL

DISCLOSURE

Not applicable.

ITEM 9A. CONTROLS AND PROCEDURES

Our management, with the participation of our chief executive officer and our chief financial officer, performed an evaluation of our
disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934 (“Exchange
Act”)) as of December 31, 2020. Our chief executive officer and our chief financial officer have concluded that our disclosure
controls and procedures were effective insofar as they are designed to provide reasonable assurance that information required to be
disclosed by us in the reports we file or submit under the Exchange Act is (i) recorded, processed, summarized and reported, within
the time periods specified in the Commission’s rules and forms, and (ii) accumulated and communicated to our management,
including our principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow
timely decisions regarding required disclosure. We believe that a controls system, no matter how well designed and operated, cannot
provide absolute assurance that the objectives of the controls system are met, and no evaluation of controls can provide absolute
assurance that all control issues and instances of fraud, if any, within a company have been detected.

There have been no changes in our internal control over financial reporting that occurred during the quarter ended December 31, 2020
that have materially affected or are reasonably likely to materially affect our internal control over financial reporting.

Management’s Report on Internal Control over Financial Reporting and the Report of Independent Registered Public Accounting Firm
are incorporated by reference to Item 8 to this Annual Report on Form 10-K.

ITEM 9B. OTHER INFORMATION

Not applicable.

88

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

Information about our Executive Officers (as of February 23, 2021):

Name

Age

Present Position and Business Experience During the Last Five Years*

Victor D. Grizzle

59

Armstrong World Industries, Inc.

President & CEO, Director since April 2016
Executive Vice President & CEO, Armstrong Building Products (2011 to April 2016)

Charles M. Chiappone

58

Armstrong World Industries, Inc.

Senior Vice President, Ceiling and Wall Solutions since April 2018
Senior Vice President, Ceiling Solutions (April 2016 to April 2018)
Vice President of Global Marketing & Commercial Excellence,
Armstrong Building Products (January 2012 to April 2016)

Mark A. Hershey

51

Armstrong World Industries, Inc.

Senior Vice President, General Counsel and Business Development since January 2020
Senior Vice President, General Counsel since July 2011
Chief Compliance Officer since February 2012
Secretary (July 2011 to June 2014 and since April 2016)

Brian L. MacNeal

54

Armstrong World Industries, Inc.

Senior Vice President, Chief Financial Officer since April 2016
Vice President, Global Finance and CFO, Armstrong Building Products (2014 to April 2016)

Heartland Energy Solutions

Interim Chief Financial Officer (2013 to 2014)

Campbell Soup Company

Vice President of Finance (2011 to 2013)

Stephen F. McNamara

54

Armstrong World Industries, Inc.

Vice President, Controller since July 2008

Ellen R. Romano

59

Armstrong World Industries, Inc.

Senior Vice President, Human Resources since July 2013
Vice President, Human Resources, Armstrong Building Products (2009 to 2013)

*

Information in parentheses regarding previously held positions indicates either the duration the Executive Officer held the
position or the year in which service in the position began.

All executive officers are elected by the Board of Directors to serve in their respective capacities until their successors are elected and
qualified or until their earlier resignation or removal.

Code of Ethics

We have adopted a Code of Business Conduct that applies to all employees, executives and directors, specifically including our Chief
Executive Officer, our Chief Financial Officer and our Controller. We have also adopted a Code of Ethics for Financial Professionals
(together with the Code of Business Conduct, the “Codes of Ethics”) that applies to all professionals in our finance and accounting
functions worldwide, including our Chief Financial Officer and our Controller.

The Codes of Ethics are intended to deter wrongdoing and to promote:

•

•

•

honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and
professional relationships;

full, fair, accurate, timely and understandable public disclosures;

compliance with applicable governmental laws, rules and regulations;

89

•

•

the prompt internal reporting of violations of the Codes of Ethics; and

accountability for compliance with the Codes of Ethics.

The Codes of Ethics are available at http://www.armstrongceilings.com/corporate/codes-policies.html and in print free of charge. Any
waiver of the Company’s Code of Business Conduct, particularly its conflicts-of-interest provisions, which may be proposed to apply
to any director or executive officer, must be reviewed in advance by the Nominating, Governance and Social Responsibility
Committee of the Board of Directors, which would be responsible for making a recommendation to the Board of Directors for
approval or disapproval. The Board of Directors’ decision on any such matter would be disclosed publicly in compliance with
applicable legal standards and the rules of the New York Stock Exchange. We intend to satisfy these requirements by making
disclosures concerning such matters available on the “For Investors” page of our website. There were no waivers or exemptions from
the Code of Business Conduct in 2020 applicable to any director or executive officer.

Other information required by Item 10 is incorporated by reference to the sections entitled “Election of Directors,” “Corporate
Governance,” and “Section 16(a) Beneficial Ownership Reporting Compliance” in the Company’s proxy statement for its 2021 annual
meeting of shareholders to be filed no later than April 30, 2021.

ITEM 11. EXECUTIVE COMPENSATION

The information required by Item 11 is incorporated by reference to the sections entitled “Compensation Discussion and Analysis,”
“Compensation Committee Report,” “Summary Compensation Table,” “Grants of Plan-Based Awards,” “Outstanding Equity Awards
at Fiscal Year-End,” “Option Exercises and Stock Vested,” “Pension Benefits,” “Nonqualified Deferred Compensation,” “Potential
Payments Upon Termination or Change in Control,” “Board of Directors – Board’s Role in Risk Management Oversight,”
“Compensation Committee Interlocks and Insider Participation” and “Compensation of Directors” in the Company’s proxy statement
for its 2021 annual meeting of shareholders to be filed no later than April 30, 2021.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED

STOCKHOLDER MATTERS

The information required by Item 12 is incorporated by reference to the sections entitled “Security Ownership of Certain Beneficial
Owners,” “Security Ownership of Management,” and “Equity Compensation Plan Information” in the Company’s proxy statement for
its 2021 annual meeting of shareholders to be filed no later than April 30, 2021.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by Item 13 is incorporated by reference to the sections entitled “Certain Relationships and Related
Transactions” and “Director Independence” in the Company’s proxy statement for its 2021 annual meeting of shareholders to be filed
no later than April 30, 2021.

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information required by Item 14 is incorporated by reference to the sections entitled “Audit Committee Report” and “Relationship
with Independent Auditors” in the Company’s proxy statement for its 2021 annual meeting of shareholders to be filed no later than
April 30, 2021.

90

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

PART IV

(a)

1.

Listing of Documents

The financial statements and schedule of Armstrong World Industries, Inc. filed as a part of this 2020 Annual Report on
Form 10-K is listed in the “Index to Financial Statements and Schedules” on Page 35.

2.

The financial statements required to be filed pursuant to Item 15 of Form 10-K are:

Worthington Armstrong Venture consolidated financial statements for the years ended December 31, 2020, 2019, and
2018 (filed herewith as Exhibit 99.1).

3.

The following exhibits are filed as part of this 2020 Annual Report on Form 10-K:

Exhibit No. Description

2.1

2.2

2.3

3.1

3.2

4.1

10.1

10.2

10.3

10.4

10.5

Armstrong World Industries, Inc.’s Fourth Amended Plan of Reorganization dated May 23, 2003 (as modified by
modifications filed with the Bankruptcy Court on October 17, 2003, November 10, 2003, December 3, 2004 and February
21, 2006) is incorporated by reference from the Annual Report on Form 10-K, filed on February 24, 2006, wherein it
appeared as Exhibit 2.3.

Separation and Distribution Agreement, dated March 11, 2016, by and between Armstrong World Industries, Inc. and
Armstrong Flooring, Inc. is incorporated by reference from the Current Report on Form 8-K filed on March 15, 2016,
wherein it appeared as Exhibit 2.1.

Plan of Division, adopted by Armstrong World Industries, Inc. on March 11, 2016 is incorporated by reference from the
Current Report on Form 8-K filed on March 15, 2016, wherein it appeared as Exhibit 2.2.

Amended and Restated Articles of Incorporation of Armstrong World Industries, Inc. is incorporated by reference from
the Current Report on Form 10-Q filed on May 1, 2017, wherein it appeared as Exhibit 3.1.

Amended and Restated Bylaws of Armstrong World Industries, Inc., are incorporated by reference from the Current
Report on Form 8-K filed on April 17, 2020, wherein it appeared as Exhibit 3.1.

Description of Securities Registered under Section 12 of the Securities Exchange Act of 1934.†

Amended and Restated Credit Agreement, dated April 1, 2016, by and among Armstrong World Industries, Inc., as
Borrower, certain subsidiaries of Armstrong World Industries, Inc. identified therein, as the Guarantors, Bank of America,
N.A., as Administrative Agent and Collateral Agent, the other lenders party thereto, JPMorgan Chase Bank, N.A. and
Citibank, N.A., as Co-Syndication Agents, Manufacturers and Traders Trust, The Bank of Nova Scotia, Fifth Third Bank,
Citizens Bank of Pennsylvania, TD Bank National Association and Bank of Montreal, as Co-Documentation Agents, and
Merrill Lynch, Pierce, Fenner & Smith Incorporated, JPMorgan Chase Bank, N.A. and Citibank, N.A., as joint lead
arrangers and joint lead managers is incorporated by reference from the Current Report on Form 8-K filed on April 4,
2016, wherein it appeared as Exhibit 10.8.

Amended and Restated Security Agreement, dated April 1, 2016, by and among Armstrong World Industries, Inc., the
grantors named therein and Bank of America, N.A. is incorporated by reference from the Annual Report on Form 10-K,
filed on February 26, 2018, wherein it appeared as Exhibit 10.2.

Amended and Restated Pledge Agreement dated, April 1, 2016, by and among Armstrong World Industries, Inc., the
pledgors named therein and Bank of America, N.A. is incorporated by reference from the Annual Report on Form 10-K,
filed on February 26, 2018, wherein it appeared as Exhibit 10.3.

Amended and Restated Canadian Pledge Agreement dated, April 1, 2016, by and among Armstrong World Industries, Inc.
and Bank of America, N.A. is incorporated by reference from the Annual Report on Form 10-K, filed on February 26,
2018, wherein it appeared as Exhibit 10.4.

Second Amendment to Credit Agreement, Amendment to Security Agreement, Amendment to Domestic Pledge
Agreement and Amendment to Canadian Pledge Agreement by and among the Company, the guarantors named therein,
JPMorgan Chase Bank, N.A., Citizens Bank, N.A., Fifth Third Bank and PNC Bank, National Association, as co-
syndication agents, Branch Banking and Trust Company, TD Bank, N.A., Manufacturers and Traders Trust Company,
The Bank of Nova Scotia, Capital One, National Association, Keybank National Association, U.S. Bank National
Association and Wells Fargo Bank, National Association, as co-documentation agents, and other lenders and L/C issuers
party hereto and BofA Securities, Inc., JPMorgan Chase Bank, N.A., Citizens Bank, N.A., Fifth Third Bank and PNC
Capital Markets, LLC, as joint lead arrangers and bookrunners, in incorporated by reference from the Current Report on

91

Exhibit No. Description

Form 8-K, filed on October 1, 2019, wherein it appeared as Exhibit 10.1.

10.6

10.7

10.8

10.9

10.10

10.11

10.12

10.13

10.14

10.15

10.16

10.17

10.18

10.19

10.20

10.21

Amended and Restated Joint Venture Agreement, dated February 22, 2016 between Armstrong Ventures, Inc. and
Worthington Ventures, Inc., is incorporated by reference from the Annual Report on Form 10-K filed on February 22,
2016, wherein it appeared as Exhibit 10.12.

Tax Matters Agreement, dated as of April 1, 2016, by and between Armstrong World Industries, Inc. and Armstrong
Flooring, Inc. is incorporated by reference from the Current Report on Form 8-K filed on April 4, 2016, wherein it
appeared as Exhibit 10.2.

Trademark License Agreement, dated as of April 1, 2016, by and between Armstrong World Industries, Inc., AWI
Licensing LLC and Armstrong Flooring, Inc. is incorporated by reference from the Current Report on Form 8-K filed on
April 4, 2016, wherein it appeared as Exhibit 10.4.

Transition Trademark License Agreement, dated as of April 1, 2016, by and between Armstrong World Industries, Inc.,
AFI Licensing LLC and Armstrong Flooring, Inc. is incorporated by reference from the Current Report on Form 8-K filed
on April 4, 2016, wherein it appeared as Exhibit 10.5.

Campus Lease Agreement, dated as of April 1, 2016, by and between Armstrong World Industries, Inc. and Armstrong
Flooring, Inc. is incorporated by reference from the Current Report on Form 8-K filed on April 4, 2016, wherein it
appeared as Exhibit 10.6.

Share Purchase Agreement, dated November 17, 2017, by and between Armstrong World Industries, Inc. and Knauf
International GmbH is incorporated by reference from the Current Report on Form 8-K filed on November 20, 2017,
wherein it appeared as Exhibit 2.1.

Deed of Amendment to the Share Purchase Agreement dated as of July 18, 2018, by and between Armstrong World
Industries, Inc. and Knauf International GmbH is incorporated by reference from the Current Report on Form 8-K filed on
July 19, 2018, wherein it appeared as Exhibit 2.1.

2006 Long-Term Incentive Plan, as amended February 23, 2009, is incorporated by reference from the Annual Report on
Form 10-K, filed on February 26, 2009, wherein it appeared as Exhibit 10.13.*

2011 Long-Term Incentive Plan, effective as of June 24, 2011, is incorporated by reference to Armstrong World
Industries, Inc.’s Definitive Proxy Statement on Schedule 14A for the Armstrong World Industries, Inc 2011 Annual
Meeting of Shareholders held on June 24, 2011 filed on April 28, 2011, wherein it appeared as Exhibit A.*

Form of 2011 Long-Term Incentive Plan Terms and Conditions (Grant of Nonqualified Stock Options — U.S. (Executive
Officer)), is incorporated by reference from the Quarterly Report on Form 10-Q filed on April 30, 2012, wherein it
appeared as Exhibit 10.1.*

Form of 2011 Long-Term Incentive Plan Terms and Conditions (Grant of Nonqualified Stock Options — U.S.), is
incorporated by reference from the Quarterly Report on Form 10-Q filed on April 30, 2012, wherein it appeared as
Exhibit 10.2.*

Form of 2011 Long-Term Incentive Plan Terms and Conditions, as amended for 2013 (Grant of Nonqualified Stock
Options – U.S. (Executive Officer)), is incorporated by reference from the Quarterly Report on Form 10-Q filed on April
29, 2013, wherein it appeared as Exhibit 10.2.*

Form of 2011 Long-Term Incentive Plan Terms and Conditions, as amended for 2013 (Grant of Nonqualified Stock
Options – U.S.), is incorporated by reference from the Quarterly Report on Form 10-Q filed on April 29, 2013, wherein it
appeared as Exhibit 10.3.*

Form of 2011 Long-Term Incentive Plan Terms and Conditions, as amended for 2014 (Grant of Nonqualified Stock
Options – U.S.), is incorporated by reference from the Quarterly Report on Form 10-Q filed on April 28, 2014, wherein it
appeared as Exhibit 10.1.*

Armstrong World Industries, Inc. 2016 Long-Term Incentive Plan, effective as of July 8, 2016 and amended and restated
effective February 20, 2019, is incorporated by reference from the Annual Report on Form 10-K filed on February 25,
2019, wherein it appeared as Exhibit 10.42.*

Form of Long-Term Performance-Based Restricted Stock Unit Grant (Performance Goals Based on Absolute TSR for
Tier I) for Senior Executives under the 2016 Long-Term Incentive Plan for years prior to 2019 is incorporated by
reference from the Current Report on Form 10-Q filed on May 1, 2017, wherein it appeared as Exhibit 10.2.*

10.22

Form of Long-Term Performance-Based Restricted Stock Unit Grant (Performance Goals Based on Absolute TSR for

92

Exhibit No. Description

Tier II) for Senior Executives under the 2016 Long-Term Incentive Plan for years prior to 2019 is incorporated by
reference from the Current Report on Form 10-Q filed on May 1, 2017, wherein it appeared as Exhibit 10.4.*

Form of Long-Term Performance-Based Restricted Stock Unit Grant (Performance Goals Based on Cumulative Free Cash
Flow for Tier I) under the 2016 Long-Term Incentive Plan for years prior to 2019 is incorporated by reference from the
Current Report on Form 10-Q filed on May 1, 2017, wherein it appeared as Exhibit 10.3.*

Form of Long-Term Performance-Based Restricted Stock Unit Grant (Performance Goals Based on Cumulative Free Cash
Flow for Tier II) under the 2016 Long-Term Incentive Plan for years prior to 2019 is incorporated by reference from the
Current Report on Form 10-Q filed on May 1, 2017, wherein it appeared as Exhibit 10.5.*

Form of Long-Term Performance-Based Restricted Stock Unit Grant for 2019 and later years under the 2016 Long-Term
Incentive Plan. *†**

Armstrong World Industries, Inc. 2020 Inducement Award Plan, is incorporated by reference from the Registration
Statement on Form S-8 filed on December 15, 2020, wherein it appeared as Exhibit 4.4.*

Nonqualified Deferred Compensation Plan effective January 2005, as amended July 23, 2010, is incorporated by reference
from the Annual Report on Form 10-K, filed on February 28, 2011, wherein it appeared as Exhibit 10.4.*

Retirement Benefit Equity Plan, effective January 1, 2005, as amended October 29, 2007 and December 8, 2008, is
incorporated by reference from the Annual Report on Form 10-K, filed on February 26, 2009, wherein it appeared as
Exhibit 10.2.*

Schedule of Participating Directors, is incorporated by reference from the Current Report on Form 8-K filed on October
23, 2007, wherein it appeared as Exhibit 10.2.*

2008 Directors Stock Unit Plan, as amended December 8, 2008, November 30, 2010 and June 24, 2011 is incorporated by
reference to the Current Report on Form 8-K filed on June 13, 2011, wherein it appeared as Exhibit 99.2.*

Form of 2009 and 2010 Award under the 2008 Directors Stock Unit Plan, as amended, is incorporated by reference from
the Quarterly Report on Form 10-Q for the quarter ended September 30, 2009, filed on October 28, 2009, wherein it
appeared as Exhibit 10.27.*

Form of 2011, 2012, 2013, 2014 and 2015 Award under the 2008 Directors Stock Unit Plan, as amended, is incorporated
by reference from the Annual Report on Form 10-K filed on February 27, 2012, wherein it appeared as Exhibit 10.40.*

Armstrong World Industries, Inc. 2016 Directors Stock Unit Plan, is incorporated by reference from the Current Report on
Form 8-K filed on July 11, 2016, wherein it appeared as Exhibit 10.1.*

Form of Stock Unit Grant Agreement under the Armstrong World Industries, Inc. 2016 Directors Stock Unit Plan, is
incorporated by reference from the Current Report on Form 8-K filed on July 11, 2016, wherein it appeared as Exhibit
10.3.*

Offer Letter to Victor D. Grizzle dated January 4, 2011, is incorporated by reference from the Current Report on Form 8-
K filed on January 10, 2011, wherein it appeared as Exhibit 99.2.*

Offer Letter to Mark A. Hershey dated April 21, 2011, is incorporated by reference from the Current Report on Form 8-K
filed on April 27, 2011, wherein it appeared as Exhibit 99.1.*

Form of Indemnification Agreement for Officers and Directors of Armstrong World Industries, Inc. is incorporated by
reference from the Report on Form 8-K filed on June 4, 2010, wherein it appeared as Exhibit 10.1.*

Form of Amended and Restated Severance Agreement with Certain Officers, approved for use on October 26, 2016 is
incorporated by reference from the Report on Form 8-K filed on October 31, 2016, wherein it appeared as Exhibit 10.1.*

The Armstrong Code of Business Conduct, revised as of July 29, 2011, is incorporated by reference from the Current
Report on Form 8-K filed on August 1, 2011, wherein it appeared as Exhibit 14.1.

Armstrong World Industries, Inc.’s Subsidiaries.†

Consent of Independent Registered Public Accounting Firm.†

Consent of Independent Auditors.†

Certification of Chief Executive Officer required by Rule 13a-15(e) or 15d-15(e) of the Securities Exchange Act.

Certification of Chief Financial Officer required by Rule 13a-15(e) or 15d-15(e) of the Securities Exchange Act.

10.23

10.24

10.25

10.26

10.27

10.28

10.29

10.30

10.31

10.32

10.33

10.34

10.35

10.36

10.37

10.38

14

21

23.1

23.2

31.1

31.2

93

Exhibit No. Description

32.1

32.2

99.1

101

104

*

†

Certification of Chief Executive Officer required by Rule 13a and 18 U.S.C. Section 1350 (furnished herewith).

Certification of Chief Financial Officer required by Rule 13a and 18 U.S.C. Section 1350 (furnished herewith).

Worthington Armstrong Venture consolidated financial statements as of December 31, 2020 and 2019 and for the years
ended December 31, 2020, 2019 and 2018.†

Inline Interactive Data Files***

The cover page from the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 has been
formatted in Inline XBRL.

Management Contract or Compensatory Plan.

Filed herewith.

**

Portions of this exhibit have been omitted as permitted by applicable regulations.

*** XBRL – Information is furnished and not filed or a part of a registration statement or prospectus for purposes of Sections
11 or 12 of the Securities Act of 1933, as amended, is deemed not filed for purposes of Section 18 of the Securities
Exchange Act of 1934, as amended, and otherwise is not subject to liability under these sections.

ITEM 16. FORM 10-K SUMMARY

None.

94

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report
to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

ARMSTRONG WORLD INDUSTRIES, INC.
(Registrant)

By:

/s/ Victor D. Grizzle
Director, President and Chief Executive Officer

Date: February 23, 2021

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Report has been signed below by the following
persons on behalf of the registrant and in the capacities and on the dates indicated.

Date

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

February 23, 2021

Signature

Title

/s/ Victor D. Grizzle
Victor D. Grizzle

/s/ Brian L. MacNeal
Brian L. MacNeal

/s/ Stephen F. McNamara
Stephen F. McNamara

/s/ Stanley A. Askren
Stanley A. Askren

/s/ Tao Huang
Tao Huang

/s/ Barbara L. Loughran
Barbara L. Loughran

/s/ Larry S. McWilliams
Larry S. McWilliams

/s/ James C. Melville
James C. Melville

/s/ Wayne R. Shurts
Wayne R. Shurts

/s/ Roy W. Templin
Roy W. Templin

/s/ Cherryl T. Thomas
Cherryl T. Thomas

Director, President and Chief Executive Officer
(Principal Executive Officer)

Senior Vice President and Chief Financial Officer
(Principal Financial Officer)

Vice President and Controller
(Principal Accounting Officer)

Director

Director

Director

Director

Director

Director

Director

Director

95

SCHEDULE II

Armstrong World Industries, Inc., and Subsidiaries
Valuation and Qualifying Reserves
(amounts in millions)

Balance at
beginning
of year

Additions
charged to
earnings

Deductions

Balance
at end of
year

2018
Provision for bad debts
Provision for discounts
Provision for warranties

2019
Provision for bad debts
Provision for discounts
Provision for warranties
Provision for inventory obsolescence

2020
Provision for bad debts
Provision for discounts
Provision for warranties
Provision for inventory obsolescence

$

$

$

$

$

$

0.3
1.5
0.1

0.3
1.3
0.4
-

0.7
1.4
0.2
0.5

$

$

$

0.1
19.2
4.2

0.7
21.0
3.0
0.6

0.9
19.4
5.5
0.1

$

$

$

(0.1)
(19.4)
(3.9)

(0.3)
(20.9)
(3.2)
(0.1)

(0.2)
(19.5)
(4.8)
(0.6)

0.3
1.3
0.4

0.7
1.4
0.2
0.5

1.4
1.3
0.9
-

96

Exhibit No. 31.1

I, Victor D. Grizzle, certify that:

1)

2)

3)

4)

I have reviewed this report on Form 10-K of Armstrong World Industries, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading
with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all
material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods
presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures
(as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in
Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)

b)

c)

d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under
our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is
made known to us by others within those entities, particularly during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be
designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the
preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our
conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this
report based on such evaluation; and

Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the
registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has
materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;
and

5)

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over
financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons
performing the equivalent functions):

a)

b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting
which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial
information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the
registrant's internal controls over financial reporting.

Date: February 23, 2021

/s/ Victor D. Grizzle
Victor D. Grizzle
Director, President and Chief Executive Officer

Exhibit No. 31.2

I, Brian L. MacNeal, certify that:

1)

2)

3)

4)

I have reviewed this report on Form 10-K of Armstrong World Industries, Inc.;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact
necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading
with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all
material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods
presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures
(as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in
Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)

b)

c)

d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under
our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is
made known to us by others within those entities, particularly during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be
designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the
preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our
conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this
report based on such evaluation; and

Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the
registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has
materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting;
and

5)

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over
financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons
performing the equivalent functions):

a)

b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting
which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial
information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the
registrant's internal controls over financial reporting.

Date: February 23, 2021

/s/ Brian L. MacNeal
Brian L. MacNeal
Senior Vice President and Chief Financial Officer

Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-
Oxley Act of 2002.

I certify to the best of my knowledge and belief that the Annual Report on Form 10-K of Armstrong World Industries, Inc. (the
“Company”) containing its financial statements for the fiscal year ended December 31, 2020 fully complies with the requirements of
Section 13(a) and 15(d) of the Securities Exchange Act of 1934, as amended, and that information contained in that report fairly
presents, in all material respects, the financial condition and results of operations of the Company as of that date.

Exhibit No. 32.1

/s/ Victor D. Grizzle

Victor D. Grizzle
Director, President and Chief Executive Officer
Armstrong World Industries, Inc.

Dated: February 23, 2021

Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-
Oxley Act of 2002.

I certify to the best of my knowledge and belief that the Annual Report on Form 10-K of Armstrong World Industries, Inc. (the
“Company”) containing its financial statements for the fiscal year ended December 31, 2020 fully complies with the requirements of
Section 13(a) and 15(d) of the Securities Exchange Act of 1934, as amended, and that information contained in that report fairly
presents, in all material respects, the financial condition and results of operations of the Company as of that date.

Exhibit No. 32.2

/s/ Brian L. MacNeal

Brian L. MacNeal
Senior Vice President and Chief Financial Officer
Armstrong World Industries, Inc.

Dated: February 23, 2021

CORPORATE INFORMATION

COMPANY PROFILE

ANNUAL MEETING OF SHAREHOLDERS

Armstrong World Industries, Inc. is a leading
producer of ceilings systems for use in the
construction and renovation of commercial and
residential buildings. In 2020, Armstrong’s
consolidated net sales totaled approximately
$936.9 million. Based in Lancaster, PA, Armstrong
has a manufacturing network of 22 facilities in the
United States and Canada, including six plants
dedicated to its WAVE joint venture, and has
approximately 2,700 employees as of December 31,
2020.

INDEPENDENT REGISTERED PUBLIC
ACCOUNTING FIRM

KPMG LLP
Philadelphia, PA

CORPORATE OFFICES / INFORMATION

Armstrong World Industries, Inc.
2500 Columbia Avenue
Lancaster, PA 17603

Additional information about Armstrong is available
without charge to shareholders by directing a request
to Investor Relations:

Thomas J. Waters, twaters@armstrongceilings.com

Corporate Website:
http://www.armstrongceilings.com
For Investors: 717.396.6354
For News media: 866.321.6677

Mailing Address:
Armstrong World Industries, Inc.
P.O. Box 3001
Lancaster, PA 17604-3001

STOCK LISTING

Armstrong’s shares are listed on the New York Stock
Exchange under the symbol AWI.

TRANSFER AGENT AND REGISTRAR

American Stock Transfer & Trust Company
6201 15th Avenue
Brooklyn, NY 11219
www.amstock.com

The 2021 Annual meeting of Shareholders of
Armstrong World Industries, Inc. will be held via the
Internet on June 24, 2021 at 8:00 a.m. Eastern Time.

CERTIFICATIONS

The certifications of our Chief Executive Officer and
Chief Financial Officer, as required by Section 302
of the Sarbanes-Oxley Act of 2002, have been filed
with the Securities and Exchange Commission as
exhibits to our Annual Report on Form 10-K.

In addition, in 2020 our Chief Executive Officer
provided the required annual certification to the New
York Stock Exchange.

FORWARD-LOOKING STATEMENTS

Certain information in this report and in our other
public documents and comments contain forward-
looking statements within the meaning of the Private
Securities Litigation Reform Act of 1995. Those
statements provide our future expectations or
forecasts and can be identified by our use of words
such as “anticipate,” “estimate,” “expect,” “project,”
“intend,” “plan,” “believe,” “outlook,” and other
words or phrases of similar meaning in connection
with any discussion of future operating or financial
performance. Forward-looking statements, by their
nature, address matters that are uncertain and involve
risks because they relate to events and depend on
circumstances that may or may not occur in the
future. A more detailed discussion of the risks and
uncertainties that could cause our actual results to
differ materially from those projected, anticipated or
implied is included in the “Risk Factors” and
“Management’s Discussion and Analysis” sections of
our recent reports on Forms 10-K and 10-Q filed with
the U.S. Securities and Exchange Commission. As a
result, our actual results may differ materially from
our expected results and from those expressed in our
forward-looking statements. Forward-looking
statements speak only as of the date they are made.
We undertake no obligation to update any forward-
looking statements beyond what is required under
applicable securities law.

2020 BOARD OF DIRECTORS

MANAGEMENT

Stan A. Askren (1)(2)(4)
CEO and Founder, Quiet Trail Advisors

Victor D. Grizzle
CEO and President

Victor D. Grizzle
CEO and President, Armstrong World Industries, Inc.

Tao Huang (3)(4)
CEO, Supernova Companies

Barbara L. Loughran (1)(2)(4)
Former Partner, PricewaterhouseCoopers LLP

Brian L. MacNeal
Senior Vice President and Chief Financial Officer

Charles M. Chiappone
Senior Vice President, Ceilings and Wall Solutions

Mark A. Hershey
Senior Vice President, General Counsel and Business
Development, Chief Compliance Officer and Secretary

Larry S. McWilliams (4)
Co-Chief Executive Officer, Compass Marketing, Inc.

Ellen R. Romano
Senior Vice President, Human Resources

James C. Melville (2)(3)(4)
Member, Kaplan, Strangis and Kaplan, P.A.

Stephen F. McNamara
Vice President and Controller

Wayne R. Shurts (1)(2)(4)
Former Executive Vice President and Chief Technology
Officer, Sysco Corporation

John J. Roberts (1)(3)(5)
Former Global Managing Partner, PricewaterhouseCoopers
LLP

Roy W. Templin (1)(3)(4)
Former Chairman of the Board, Con-Way Incorporated

Cherryl T. Thomas (2)(3)(4)
Chief Strategy Officer and Vice President, Ardmore
Roderick

(1) Audit Committee
(2) Management Development and Compensation

Committee

(3) Nominating, Governance and Social Responsibility

Committee
Finance Committee

(4)

(5) Retired in connection with the 2020 Annual Meeting of

Shareholders