X0305 4 2012-05-11 0 0001124941 BEACON ROOFING SUPPLY INC BECN 0001214749 ISABELLA PAUL ONE LAKELAND PARK DRIVE PEABODY MA 01960 0 1 0 0 President & CEO Common Stock 2012-05-11 4 P 0 19600 25.3982 A 75600 D The purchase price in Column 4 of Table 1 represents a weighted average purchase price. Purchases were made at prices ranging from $25.37 to $25.40. The undersigned undertakes to provide to the staff of the Securities and Exchange Commission, the issuer and any securityholder of the issuer upon request the number of shares bought at each separate price. Paul M. Isabella 2012-05-15