CertainTeed® has helped shape the building products industry for more than 110 years. It was founded in 1904 as a General Roofing Manufacturing Company. Today, it is North America’s leading brand of exterior and interior building products, including roofing, siding, fencing, decking, railing, trim, insulation, gypsum and ceilings. CertainTeed and its affiliates have more than 6,300 employees and more than 60 manufacturing facilities throughout the United States and Canada. It is a subsidiary of Saint-Gobain.