Building Materials Corporation of America (BMCA), doing business as GAF Materials, wants to keep your roof looking spiffy. BMCA, which deals primarily in shingles and roofing systems, also makes flashing, vents, decorative stone for fireplaces, decking, and wrought iron balusters. Its GAF-Elk products include Timberline- and Sovereign-brand residential shingles and GAF CompositeRoof for commercial roofing. Customers include contractors, distributors, property owners, and retail outlets like The Home Depot. Founded in 1886, GAF is one of North America's largest manufacturers of commercial and residential roofing. It is a subsidiary of G-I Holdings, which is controlled by the family of the late Samuel Heyman.