The biggest ICF manufacturers in the USA, with their headquarters and manufacturing locations, are:
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BuildBlock Building Systems: HQ in Oklahoma City, OK; 14 manufacturing facilities across the USA, Mexico, and Canada (specific U.S. sites not detailed).
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Fox Blocks (Airlite Plastics): HQ in Omaha, NE; multiple manufacturing locations across North America (specific U.S. sites not detailed).
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Amvic Building Solutions: HQ likely in Canada (Toronto, ON); manufacturing facilities in North America, with a strong U.S. distribution network (U.S. sites not specified).
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Nudura Inc.: HQ in Barrie, ON, Canada; manufacturing in the USA and Canada (U.S. sites not specified).
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Logix/Element ICF: HQ consortium-based (e.g., Canada and Johnson City, TN); manufacturing includes Johnson City, TN, and other North American sites (U.S. sites not fully detailed).