Founded in 1886, GAF Materials Corporation is one of the larges building products manufacturers in North America. It provides roofing, decking and railing products, as well as decorative stone and specialty fabrics. The company offers shingles and roof vents in various colors and styles for residential and commercial properties. GAF Materials Corporation provides product installation guides and tips for property owners, architects, distributors and contractors. The company provides decking and railways railing systems. Through LL Building Products, it offers metal ductwork and ornamental iron for the building and door hardware industries. GAF Materials Corporation provides pipes, elbows, fittings and insulated flexible ducts.