Allied Building Products Corp. | 17,282 followers on LinkedIn. Allied Building Products , A Beacon Roofing Supply Company, is an Exterior (Commercial-Residential Roofing and related) and Interior (Drywall, Acoustical ceilings and related) building products distributor with over 200 locations nationwide. We pride ourselves on first class customer service, product selection and availability, business programs to separate you from your competition and safe on-time delivery.