CertainTeed LLC

CertainTeed is a manufacturer of exterior and interior building products, including roofing, siding, fence, decking, railing, trim, insulation, gypsum and ceilings, with windows among its exterior offerings. Founded in 1904 as the General Roofing Manufacturing Company and headquartered in Malvern, Pennsylvania, it operates as a subsidiary of Saint-Gobain. The company runs more than 60 manufacturing facilities across the United States and Canada.