CertainTeed Corporation is a leading U.S. manufacturer and distributor of commercial and residential building materials. Specifically, the company designs and manufactures a large variety of materials including: ceiling systems; insulation; roofing shingles; clay roofing tiles and slates; vinyl siding and accessories; vinyl windows; vinyl fencing; decking and railing; ventilation products; fiber-cement siding; injection molded products; PVC pipe and foundation products; and retractable awning and canopy systems. The company also manufacturers fiberglass reinforcements. CertainTeed maintains 45 manufacturing facilities in North America and sells its products in building supply stores nationwide. In 1988 the company became a wholly owned subsidiary of Compagnie de Saint-Gobain, the world’s largest manufacturer of building materials.