No, Owens Corning and CertainTeed are entirely separate, competing corporations owned by different parent companies. Owens Corning is an independent U.S.-headquartered publicly traded company (NYSE: OC), while CertainTeed is a major North American subsidiary of Saint-Gobain, a massive multinational building materials group headquartered in France. While both companies manufacture overlapping product lines like roofing shingles, insulation, and siding, they operate completely independent manufacturing, research, and distribution networks.
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