Exhibit No. 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Armstrong World Industries, Inc.:

We consent to the incorporation by reference in the registration statements (Nos. 333-138034, 333-154765, 333-177072, and 333-212457) on Form S-8 and in the registration statement (No. 333-202253) on Form S-3 of Armstrong World Industries, Inc. of our reports dated February 26, 2108, with respect to the consolidated balance sheets of Armstrong World Industries, Inc. and subsidiaries as of December 31, 2017 and 2016, and the related consolidated statements of earnings and comprehensive income, equity, and cash flows for each of the years in the three-year period ended December 31, 2017, and the related notes and financial statement schedule of valuation and qualifying reserves (collectively, the “consolidated financial statements”), and the effectiveness of internal control over financial reporting as of December 31, 2017, which reports appear in the December 31, 2017 annual report on Form 10‑K of Armstrong World Industries, Inc.

/s/ KPMG LLP

Philadelphia, Pennsylvania

February 26, 2018