Cornerstone Building Brands, Inc. engages in the design, engineer and manufacture external building products. It operates through the following segments: Commercial, Siding, and Windows. The Commercial segment produces and distributes metal products for the nonresidential construction market. The Siding segment comprises of vinyl siding and skirting, steel siding, vinyl and aluminum soffit, aluminum trim coil, aluminum gutter coil, aluminum gutters, aluminum and steel roofing accessories, wide crown molding, window and door trim, fascia, undersill trims, outside and inside corner posts, rain removal systems, and injection molded designer accents. The Windows segment consists of vinyl, aluminum-clad vinyl, aluminum, wood and clad-wood windows and patio doors and steel, wood, and fiberglass entry doors that serve both the new construction and the home repair, and remodeling sectors. The company was founded by Johnie Schulte in 1984 and is headquartered in Cary, NC.