With products from Guardian Building Products Distribution (GBPD), some assembly is required. The company supplies building products through about 30 distribution centers across the US. GBPD sells roofing, millwork, insulation, vinyl siding, and other materials for home improvement, remodeling, and new home and commercial construction. It also partners with other building products OEMs to supply building materials. The company's customers include builders, building materials dealers, contractors, cooperatives, and warehouse chains, such as The Home Depot and Lowe's. GBPD is part of Guardian Building Products' group of companies, owned by Guardian Industries, one of the world's largest glassmakers.