POWER OF ATTORNEY
For SEC Section 16 Reporting and Related Matters

      I hereby constitute and appoint each of Thomas B. Mangas, Mark A. Hershey
and Christopher S. Parisi as my true and lawful attorneys-in-fact and agents,
and grant each of them, acting alone, full power to act on my behalf and in my
name, place and stead, in any and all capacities for the purposes of signing on
my behalf, any Form ID, Form 3, Form 4 or Form 5 required to be filed by me
pursuant to Section 16 of the Securities and Exchange Act of 1934, as amended,
and any Form 144 required to be filed by me under the Securities Act of 1933, as
amended, and Rule 144 promulgated thereunder including, without limitation, the
power to sign any and all amendments to such forms, if any, and to file such
forms with the Securities and Exchange Commission, and to do and perform each
and every act and thing requisite or necessary to be done in connection with
such forms, as fully and to all intents and purposes as I might or could do in
person. The authority under this Power of Attorney shall continue until I am no
longer required to file Form ID, Form 3, Form 4, Form 5 and Form 144 with regard
to my ownership of or transactions in securities of Armstrong World Industries,
Inc., unless earlier revoked in writing.

      I acknowledge that the above-named attorneys-in-fact are not assuming any
of my responsibilities to comply with Rule 144 of the Securities Act of 1933,
Section 16 of the Securities and Exchange Act of 1934, or any other securities
laws.

      IN WITNESS WHEREOF, I have signed my name this 29th	 day of February,
2012.




         							/s/ Stephen F. McNamara
      Stephen F. McNamara