Cornerstone Building Brands, Inc., together with its subsidiaries, designs, engineers, manufactures, and markets external building products for the commercial, residential, and repair and remodel construction markets in North America. The company operates through three segments: Commercial, Siding, and Windows. The Commercial segment manufactures and distributes various metal products for the nonresidential construction markets under various brand names through a network of plants and distribution centers. It also provides metal coil coating services for commercial and construction applications. The Siding segment offers vinyl siding and skirting products, steel siding products, vinyl and aluminum soffit products, aluminum trim coils, aluminum gutter coils, aluminum gutters, aluminum and steel roofing accessories, cellular PVC trims and moldings, J-channels, wide crown moldings, window and door trims, F-channels, H-molds, fascia, undersill trims, outside/inside corner posts, rain removal systems, and injection molded designer accents, such as shakes; shingles; scallops; shutters; vents and mounts; vinyl fence; vinyl railing; and stone veneer. The Windows segment provides vinyl, aluminum-clad vinyl, aluminum, wood, and clad-wood windows and patio doors; and steel, wood, and fiberglass entry doors. The company was formerly known as NCI Building Systems, Inc. and changed its name to Cornerstone Building Brands, Inc. in May 2019. Cornerstone Building Brands, Inc. was founded in 1984 and is headquartered in Cary, North Carolina.