Exhibit 99.1

Armstrong World Industries Reports

First Quarter 2015 Results

Key Highlights

LANCASTER, Pa., April 30, 2015 —Armstrong World Industries, Inc. (NYSE: AWI), a global leader in the design and manufacture of floors and ceiling systems, today reported first quarter 2015 results.

First Quarter Results from continuing operations

Excluding the unfavorable impact from foreign exchange of $20 million, consolidated net sales decreased 3.3% compared to the prior year period driven by lower volumes across all businesses which more than offset the impact from favorable price and mix.

The decline in operating income and net income compared to the prior year period was impacted by higher non-cash U.S. Pension expense and separation costs related to the previously announced spin-off of the Flooring business. The declines in operating income and net income were also driven by the margin impact of lower volumes, increased SG&A expense and lower earnings from WAVE, which were only partially offset by favorable price and mix. The decline in net income was also impacted by state net operating loss write-offs as a result of a change in ownership under section 382 of the Internal Revenue Code in conjunction with the sale of stock by the Asbestos Trust in the first quarter of 2015.

“While the year started slowly we saw activity accelerate throughout the quarter and our sales and adjusted EBITDA guidance for the year remain unchanged,” said Matt Espe, CEO. “We continue to make progress on the separation and I’m pleased to announce the Board has designated Larry McWilliams to serve as the Chairman of Armstrong Flooring upon completion of the separation, and Jim O’ Connor will remain Chairman of Armstrong World Industries. Larry and Jim have each been tremendous assets to Armstrong over the past several years and will provide both companies with a steady hand through the separation and excellent strategic leadership moving forward.”

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

Adjusted operating income and adjusted EBITDA declined by 17% and 10%, respectively, in the first quarter of 2015 when compared to the prior year period. The decline in adjusted EBITDA was driven primarily by the margin impact of lower volumes and increased SG&A expenses which were only partially offset by favorable price and mix. Adjusted earnings per share is calculated using a 39% adjusted tax rate in both periods. The improvement in free cash flow was driven by lower capital expenditures and improvements in working capital, and aided by the utilization of VAT credits associated with our emerging market investments which more than offset lower cash earnings and decreased dividends from WAVE.

First Quarter Segment Highlights

Building Products

Excluding the unfavorable impact of foreign exchange of approximately $17 million, net sales were flat over a strong base period as sales in the first quarter of 2014 were up over 5%. When looking at the net sales comparison for the first quarter of 2015 versus the first quarter of 2014, favorable price and mix offset the impact of lower volumes in the Americas and in EMEA markets. Operating income increased 3.5% in the first quarter of 2015, driven by favorable price and mix and lower manufacturing and input costs which were partially offset by the margin impact of lower volumes and higher SG&A expenses.

Resilient Flooring

Excluding the unfavorable impact of foreign exchange of approximately $2 million, net sales decreased driven by lower volumes primarily in the Americas and unfavorable price and mix. Operating income declined driven by unfavorable price and mix, increased SG&A expenses and the margin impact of lower volumes which were partially offset by lower manufacturing input costs.

Wood Flooring

Net sales declined as improvements in price and mix were more than offset by volume declines. The volume declines were caused by market share shifts as a result of prior year price and mix optimization actions and inventory adjustments at home centers. Operating income declined primarily due the margin impact of lower volumes and increased manufacturing and input costs, which were only partially offset by positive price and mix.

Corporate

Unallocated corporate expense of $28.7 million increased from $19.5 million in the prior year due to higher non-cash U.S. Pension expense and separation costs.

Earnings Webcast

Management will host a live Internet broadcast beginning at 11:00 a.m. Eastern time today, to discuss first quarter 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.

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 quarterly report on Form 10-Q for the quarter ended March 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 ceiling systems. In 2014, Armstrong’s consolidated net sales from continuing operations totaled approximately $2.5 billion. As of March 31, 2015, Armstrong operated 32 plants in nine countries and had approximately 7,500 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, quarterly data is unaudited)

Selected Cash Flow Information

(amounts in millions, quarterly data is 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, 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

CONSOLIDATED RESULTS FROM CONTINUING OPERATIONS

Source: Armstrong World Industries