Through the responsible development of innovative and sustainable building products, CertainTeed has helped shape the building products industry for more than 110 years. Founded in 1904 as General Roofing Manufacturing Company, today, CertainTeed is North Americas leading brand of exterior and interior building products, including roofing, siding, fence, decking, railing, trim, insulation, gypsum, and ceilings. A subsidiary of Saint Gobain, one of the worlds largest and oldest building products companies, CertainTeed and its affiliates have more than 5,700 employees and more than 60 manufacturing facilities throughout the United States and Canada.