Owens Corning has approximately 70 to 80 manufacturing plants worldwide as of 2024-2026, with the exact number varying due to acquisitions, closures, and new openings. The company operates globally with plants in over 30 countries across North America, Europe, Asia-Pacific, and Latin America. Its manufacturing footprint is divided among its three major business segments. Roofing and Asphalt operates about 15 to 20 plants in the US making shingles, underlayments, and asphalt products, located near major markets to reduce shipping costs. Insulation operates about 30 to 35 plants globally making fiberglass batts, rolls, foam, and mineral wool, including large fiberglass plants in the US, Canada, Europe, and Asia. Composites, which makes glass fiber reinforcements for composites, operates about 20 to 25 plants globally. Owens Corning is constantly optimizing its footprint, closing older less efficient plants and opening new ones closer to growth markets, such as recent expansions in India and Europe. The company reports its plant count in its annual report and sustainability report, though it does not always give a precise total because some sites are distribution centers or joint ventures. For context, its largest competitors like Saint-Gobain have hundreds of plants, but Owens Corning's network is substantial and strategically located near customers in construction and industrial markets to serve its global customer base efficiently with building materials.
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