POWER OF ATTORNEY

     Know all by these presents, that the undersigned hereby constitutes and
     appoints each of Austin K. So and Alan M. Kidd of Armstrong World
     Industries, Inc. or any of them signing singly, and with full power of
     substitution, the undersigned's true and lawful attorney-in-fact to:

     1. prepare, execute in the undersigned's name and on the undersigned's
        behalf, and submit to the U.S. Securities and Exchange Commission (the
        "SEC") a Form ID, including amendments thereto, and any other documents
        necessary or appropriate to obtain codes and passwords enabling the
        undersigned to make electronic filings with the SEC of reports required
        by Section 16(a) of the Securities Exchange Act of 1934 or any rule or
        regulation of the SEC;

     2. take any other action of any type whatsoever in connection with the
        foregoing which, in the opinion of such attorney-in-fact, may be of
        benefit to, in the best interest of, or legally required by, the
        undersigned, it being understood that the documents executed by such
        attorney-in-fact on behalf of the undersigned pursuant to this Power
        of Attorney shall be in such form and shall contain such terms and
        conditions as such attorney-in-fact may approve in such attorney-in-
        fact's discretion.

     The undersigned hereby grants to each such attorney-in-fact full power
     and authority to do and perform any and every act and thing whatsoever
     requisite, necessary, or proper to be done in the exercise of any of the
     rights and powers herein granted, as fully to all intents and purposes
     as the undersigned might or could do if personally present, with full
     power of substitution or revocation, hereby ratifying and confirming all
     that such attorney-in-fact, or such attorney-in-fact's substitute or
     substitutes, shall lawfully do or cause to be done by virtue of this power
     of attorney and the rights and powers herein granted. The undersigned
     acknowledges that the foregoing attorneys-in-fact, in serving in such
     capacity at the request of the undersigned, are not assuming any of the
     undersigned's responsibilities to comply with Section 16 of the Securities
     Exchange Act of 1934.

     This Power of Attorney shall remain in full force and effect unless
     revoked by the undersigned in a signed writing delivered to the foregoing
     attorneys-in-fact.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to
     be executed as of this 7th day of February 2023.






/s/ Mark A. Hershey
Name: