Exhibit 99.1

Armstrong World Industries

Reports Fourth Quarter and Full Year 2015 Results

Key Highlights

LANCASTER, Pa., February 22, 2016 —Armstrong World Industries, Inc. (NYSE: AWI), a global leader in the design and manufacture of floors and ceilings systems, today reported fourth quarter and full year 2015 results.

Fourth Quarter Results from continuing operations

Excluding the unfavorable impact from foreign exchange of $22 million, consolidated net sales increased 2.1% compared to the prior year period driven by higher volumes and favorable mix.

Operating income declined compared to the prior year period driven by costs associated with the previously announced separation of the flooring business, increased SG&A expense to support go-to-market initiatives in the Americas Resilient business, higher non-cash U.S. pension expense, higher manufacturing costs and unfavorable price and mix; which were only partially offset by lower input costs, higher earnings from the WAVE joint venture and the margin impact of higher volumes. Net income was negatively impacted compared to the prior year period by non-cash foreign exchange rate losses on the translation of unhedged cross-currency intercompany loans denominated in Russian Rubles used to fund construction of a mineral fiber ceilings plant that was completed in the first quarter of 2015.

“Volume improvement in the fourth quarter in both our U.S. flooring and ceilings businesses helped us to deliver full year adjusted EBITDA of $391 million, just over the high end of our guidance range,” said Matt Espe, CEO. “We also made significant progress towards the separation of our flooring and ceilings businesses, and I am pleased to report that we are now targeting April 1^st as the closing date for the transaction.”

Additional (non-GAAP*) Financial Metrics from continuing operations

Adjusted operating income and adjusted EBITDA decreased by 13% and 6%, respectively, in the fourth quarter of 2015 when compared to the prior year period. The decrease in adjusted EBITDA was driven by increased SG&A expense to support go-to-market initiatives in the Americas Resilient business, higher manufacturing costs and unfavorable price and mix; which were only partially offset by lower input costs, higher earnings from the WAVE joint venture and the margin impact of higher volumes. The decrease in adjusted EPS versus the prior year includes the non-cash foreign exchange impact on inter-company loans of $0.08 per share.

Adjusted earnings per share is calculated using a 39% adjusted tax rate in both periods. The decrease in free cash flow was driven primarily by lower cash earnings which were only partially offset by improvements in working capital.

Fourth Quarter Segment Highlights

Building Products

Excluding the unfavorable impact of foreign exchange of approximately $17 million, net sales increased in the fourth quarter by 1.1% as favorable price and mix in all regions offset the impact of lower volumes in EMEA and the Pacific Rim. Excluding the unfavorable impact from foreign exchange of $2 million, net sales in the Americas were up 2.5% driven by higher volumes and favorable price and mix performance. Operating income was negatively impacted in the fourth quarter of 2015 by cost reduction actions in EMEA and by our decision to idle one of our Building Products plants in China during 2016. Increased SG&A expenses and the margin impact of lower volumes were more than offset by favorable price and mix performance, lower manufacturing and input costs and higher earnings from WAVE.

Resilient Flooring

Excluding the unfavorable impact from foreign exchange of $4 million, net sales increased by 3.6% driven by volume growth in both the Americas and Pacific Rim and favorable mix performance, which was only partially offset by unfavorable price. Operating income declined due to higher SG&A expenses primarily related to ongoing promotional spending to support go-to-market initiatives in the Americas, unfavorable price and mix and higher manufacturing costs, primarily due to LVT plant startup expenses, which were only partially offset by lower input costs and the margin impact of higher volumes.

Wood Flooring

Net sales increased as higher volumes more than offset the unfavorable impact from price and mix. Operating income improved driven by lower input costs and the margin impact of higher volumes which more than offset higher manufacturing costs and increased SG&A expense. The comparison was also impacted by a non-cash impairment charge of $10 million recorded in the fourth quarter of 2014 to reduce the carrying value of a Wood Flooring trademark to its estimated fair value and due to additional expenses recorded in the fourth quarter of 2014 associated with the closure of our engineered wood flooring plant in Kunshan China that was closed during the third quarter of 2014.

Corporate

Unallocated corporate expense of $48.5 million increased from $15.7 million in the prior year primarily due to increased U.S. pension costs of $6 million and separation costs of $18 million.

Year to Date Results from continuing operations

Excluding the unfavorable impact from foreign exchange of $95 million, consolidated net sales were flat compared to the prior year as volume declines were offset by favorable price and mix.

Operating income declined by 22% driven primarily by costs associated with the previously announced separation and higher non-cash U.S. pension costs. Adjusted EBITDA improved slightly over the prior year period as lower input costs, favorable price and mix offset higher SG&A expenses, the margin impact of lower volumes and increased manufacturing expenses. The increase in free cash flow was driven by improvements in working capital and lower capital expenditures, which were only partially offset by lower cash earnings and dividends from the WAVE joint venture.

Earnings Webcast

Management will host a live Internet broadcast beginning at 11:00 a.m. Eastern time today, to discuss fourth quarter and full year 2015 results. This event will be broadcast live on the Company’s Web site. To access the call and accompanying slide presentation, go to www.armstrong.com and click “For Investors.” The replay of this event will also be available on the Company’s Web site for up to one year after the date of the call.

Separation and Business Update Meeting

The Company will be hosting a separation and business update meeting on March 10 where both businesses will provide their 2016 outlook. While the event is by invitation only, it will be webcast live and the materials will be made available on our website shortly before the event.

Uncertainties Affecting Forward-Looking Statements

Disclosures in this release, including without limitation, those relating to future financial results guidance and our plan to separate our Flooring business from our Ceilings (Building Products) business 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” sections of our reports 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 annual report on Form 10-K for the year ended December 31, 2015 that the Company expects to file with the SEC today.

Armstrong World Industries, Inc. is a global leader in the design and manufacture of floors and ceilings. In 2015, Armstrong’s consolidated net sales from continuing operations totaled approximately $2.4 billion. As of December 31, 2015, Armstrong operated 32 plants in nine countries and had approximately 7,600 employees worldwide.

Additional forward looking non-GAAP metrics are available on the Company’s web site at http://www.armstrong.com/ under the Investor Relations 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)

(quarterly data is unaudited)

Selected Balance Sheet Information

(amounts in millions)

Selected Cash Flow Information

(amounts in millions)

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, the non-cash impact of the U.S. pension plan, separation costs and certain other gains and losses. Adjusted figures are reported in comparable dollars using the budgeted exchange rate for 2015. 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.

CONSOLIDATED RESULTS FROM CONTINUING OPERATIONS

BUILDING PRODUCTS

RESILIENT FLOORING

WOOD FLOORING

UNALLOCATED CORPORATE

CASH FLOW⁽¹⁾

CONSOLIDATED RESULTS FROM CONTINUING OPERATIONS

Source: Armstrong World Industries