X0306 4 2014-01-17 0 0000007431 ARMSTRONG WORLD INDUSTRIES INC AWI 0001509566 Grizzle Victor C/O ARMSTRONG WORLD INDUSTRIES, INC. 2500 COLUMBIA AVE LANCASTER PA 17603 0 1 0 0 Executive V.P., Armstrong Bdg Common Stock 2014-01-17 4 F 0 678 61.37 D 3906 D Represents the number of shares withheld by the Issuer to satisfy the Reporting Person's tax obligations incurred upon the vesting of the third installment (1,954) of restricted stock units granted (5,862) to the Reporting Person under the 2006 Long-Term Incentive Plan and previously disclosed by the Reporting Person. Reflects beneficial ownership of the securities underlying the original grant described in footnote 1. /s/Christopher S. Parisi, Attorney-in-fact 2014-01-21