CertainTeed - Founded in 1904 as General Roofing Company, the firm made its slogan "Quality Made Certain, Satisfaction Guaranteed," which quickly inspired the name CertainTeed. Today, CertainTeed is a leading North American manufacturer of residential and commercial roofing; vinyl and fiber cement siding; vinyl and composite decking, railing and fencing; vinyl windows; residential, commercial and mechanical insulation; pipe and foundations. Headquartered in Valley Forge, PA, CertainTeed is a Saint-Gobain company with approximately 9,000 employees and 75 manufacturing facilities throughout the U.S.
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