Armstrong World Industries Reports First Quarter 2018 Results

                                                                                                                        Exhibit 99.1

Armstrong World Industries Reports
First Quarter 2018 Results

Key Highlights

• As reported net sales of $227.3 million, up 3% versus the prior year quarter
• Architectural Specialties segment sales grew 22% with an adjusted EBITDA margin of 24%, expanding by almost 700 basis points versus the prior year quarter
• As reported operating income from continuing operations of $49.6 million, down 13% versus the prior year quarter, driven primarily by accelerated depreciation charges associated with closure of the St. Helens facility
• 1.2 million shares repurchased in the first quarter for approximately $70 million
• Adjusted EBITDA up 5% versus the prior year quarter, with adjusted EBITDA margins expanding 60 basis points

LANCASTER, Pa., April 30, 2018 -- Armstrong World Industries, Inc. (NYSE:AWI), a leader in the design, innovation and manufacture of commercial and residential ceiling, wall and suspension system solutions, today reported financial results for the first quarter.     

First Quarter Results from Continuing Operations

Consolidated net sales increased compared to the prior year quarter, driven by higher Architectural Specialties volumes and higher Mineral Fiber average unit values ("AUV"), in which both positive mix and positive like for like pricing contributed.

Operating income decreased over the prior year quarter, driven by $7.7 million of St. Helens accelerated depreciation and higher manufacturing and input costs, offset by positive AUV, volume growth in Architectural Specialties and SG&A savings.

Additional (non-GAAP*) Financial Metrics from Continuing Operations

*    The Company uses the above non-GAAP adjusted measures in managing the business and believes the adjustments provide meaningful comparisons of operating performance between periods. Adjusted EBITDA, adjusted net income, and adjusted EPS exclude the impact of foreign exchange, restructuring and related costs, impairments, U.S. pension plan expense, environmental insurance recoveries and expenses, and certain other gains and losses. The Company excludes U.S. pension expense in the non-GAAP results as it represents the actuarial net periodic benefit cost recorded, while for all periods presented, the Company was not required and did not make cash contributions to the U.S. Retirement Income Plan based on guidelines established by the Pension Benefit Guaranty Corporation. Adjusted free cash flow is defined as cash from operations and dividends received from the WAVE joint venture, less expenditures for property and equipment, and is adjusted to remove the impact of cash used or proceeds received for acquisitions and divestitures. Adjusted figures are reported in actual dollars using the budgeted exchange rate for 2018, and are reconciled to the most comparable GAAP measures in tables at the end of this release.   

Consolidated adjusted EBITDA improved 5% in the first quarter when compared to the prior year quarter, driven by volume growth in Architectural Specialties, solid AUV fall-through to profit, and lower SG&A expenses, which were partially offset by higher manufacturing and input costs and lower equity earnings from WAVE. Adjusted earnings per share reflects a 25% adjusted tax rate in both 2018 and 2017. Adjusted free cash flow improvement was driven primarily by higher cash earnings and lower capital expenditures.

"First quarter financial results were generally in line with our expectations, particularly in light of weather conditions," said Vic Grizzle, President and CEO of Armstrong. "I'm especially pleased with our Architectural Specialties business, which delivered a second consecutive quarter of greater than 20% organic growth and dramatically expanded profit margins. Our Mineral Fiber manufacturing team also executed extremely well, driving solid productivity gains in the quarter."

First Quarter Segment Highlights
In connection with the announced sale of the EMEA and Pacific Rim businesses, the EMEA and Pacific Rim segments have been excluded from results of continuing operations. As a result, the Company's operating segments are as follows: Mineral Fiber, Architectural Specialties and Unallocated Corporate.

Mineral Fiber

Net sales grew primarily by AUV expansion, offset by lower volume versus the prior year quarter.

Operating income decreased $11.8 million, driven mainly by $7.7 million of accelerated depreciation related to the previously announced closure of our St. Helens plant and higher manufacturing and input costs, partially offset by SG&A savings and the margin impact of higher sales.

Architectural Specialties

Net sales grew primarily by higher sales volume from increased market penetration, new construction activity and a full quarter of sales contribution from Tectum, which was acquired in January 2017.

Operating income increased due to the positive impact of higher sales volume and slightly lower SG&A expenses.

Unallocated Corporate

Unallocated corporate expense of $2.4 million decreased from $3.0 million of expense in the prior year quarter, primarily due to lower costs associated with the U.S. pension plan.

Market Outlook and 2018 Guidance

"We are reaffirming our full year guidance of 5%-7% revenue growth, greater than 10% adjusted EBITDA growth, and free cash flow growth of 20%-30% versus the prior year," said Brian MacNeal, CFO. "We are raising our EPS guidance to a range of $3.60 to $3.82, or 19% to 27% growth year-over-year, as a result of $70 million of share repurchases in the first quarter, which has reduced our outstanding share count to 52 million from 53 million previously."

Earnings Webcast

Management will host a live Internet broadcast beginning at 11:00 a.m. Eastern time today, to discuss first quarter results. This event will be broadcast live on the Company's website. To access the call and accompanying slide presentation, go to www.armstrongceilings.com and click Investors. The replay of this event will also be available on the Company's website for up to one year after the date of the call.

Uncertainties Affecting Forward-Looking Statements

Disclosures in this release, including without limitation, those relating to future financial results, market conditions and guidance, 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," "target," "predict," "may," "will," "would," "could," "should," "seek," 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. As a result, our actual results may differ materially from our expected results and from those expressed in our forward-looking statements. 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" section of our report on Forms 10-K and 10-Q filed with the U.S. Securities and Exchange Commission ("SEC"). 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.

About Armstrong and Additional Information

More details on the Company's performance can be found in its quarterly report on Form 10-Q for the quarter ended March 31, 2018 that the Company expects to file with the SEC today.

Armstrong World Industries, Inc. (AWI) is a global leader in the design, innovation and manufacture of commercial and residential ceiling, wall and suspension system solutions. For more information, visit www.armstrongceilings.com.

Additional forward looking non-GAAP metrics are available on the Company's website at www.armstrongceilings.com under the Investors tab. The website is not part of this release and references to our website address in this release are intended to be inactive textual references only.

As Reported Financial Highlights

FINANCIAL HIGHLIGHTS
Armstrong World Industries, Inc. and Subsidiaries
(Amounts in millions, except for per-share amounts, quarterly data is unaudited)

SEGMENT RESULTS
Armstrong World Industries, Inc. and Subsidiaries
(Amounts in millions)
(Unaudited)

Selected Balance Sheet Information
(Amounts in millions)

Selected Cash Flow Information
(Amounts in millions)
(Unaudited)

Supplemental Reconciliations of GAAP to non-GAAP Results (unaudited)
(Amounts in millions, except per share data)

To supplement its consolidated financial statements presented in accordance with accounting principles generally accepted in the United States ("GAAP"), the Company provides additional measures of performance adjusted to exclude the impact of foreign exchange, restructuring charges and related costs, impairments, U.S. pension plan income/expense, separation costs and certain other gains and losses. The Company excludes U.S. pension income/expense in the non-GAAP results as it represents the actuarial net periodic benefit credit/cost recorded as a component of operating income and for all periods presented, the Company was not required and did not make cash contributions to the U.S. Retirement Income Plan based on guidelines established by the Pension Benefit Guaranty Corporation, nor does the Company expect to make cash contributions to the plan in 2018. Adjusted free cash flow is defined as cash from operations and dividends received from the WAVE joint venture, less expenditures for property and equipment, and is adjusted to remove the impact of cash used or proceeds received for acquisitions and divestitures. The Company believes adjusted free cash flow is useful because it provides insight into the amount of cash that the Company has available for discretionary uses, after expenditures for capital commitments and adjustments for acquisitions and divestitures. Adjusted figures are reported in comparable dollars using the budgeted exchange rate for 2018. The Company uses these adjusted performance measures in managing the business, including communications with its Board of Directors and employees, and believes that they provide users of this financial information with meaningful comparisons of operating performance between current results and results in prior periods. The Company believes that these non-GAAP financial measures are appropriate to enhance understanding of its past performance, as well as prospects for its future performance. A reconciliation of these adjustments to the most directly comparable GAAP measures is included in this release and on the Company's website. These non-GAAP measures should not be considered in isolation or as a substitute for the most comparable GAAP measures. Non-GAAP financial measures utilized by the Company may not be comparable to non-GAAP financial measures used by other companies.

In the following charts, numbers may not sum due to rounding.

Consolidated Results From Continuing Operations - Adjusted EBITDA

 (1) U.S. pension expense represents the actuarial net periodic benefit cost expected to be recorded as a component of operating income. For all periods presented, we were not required and did not make cash contributions to our U.S. Retirement Income Plan based on guidelines established by the Pension Benefit Guaranty Corporation.

Mineral Fiber

Architectural Specialties

Unallocated Corporate

Adjustment to 2017 Results

(1) This new accounting standard, which was effective January 1, 2018, requires all components of our supplemental pension and post-retirement benefit plans, excluding service costs, to be recorded below operating income/EBITDA. These changes also apply to the Mineral Fiber segment.

Adjusted Free Cash Flow

Consolidated Results From Continuing Operations - Adjusted Diluted Earnings Per Share

(1) U.S. pension (credit) expense represents the actuarial net periodic pension (credit) cost recorded as a component of operating income. For all periods presented, we were not required and did not make cash contributions to our U.S. Retirement Income Plan based on guidelines established by the Pension Benefit Guaranty Corporation.
 (2) Based on ~53 million diluted shares outstanding for the three months ended Mar 31, 2018 and ~54 million diluted shares outstanding for the three months ended Mar 31, 2017.  

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