NCSUSD

Cornerstone Building Brands Inc

A maker of exterior building products, Cornerstone Building Brands manufactures vinyl windows, siding, doors, metal roofing, and building systems sold under brands like Ply Gem, Simonton, and Mastic — used on homes, schools, hospitals, and offices across North America. It was born in 2018 when metal-building maker NCI Building Systems merged with Ply Gem, a company founded in the 1940s that started by reselling plywood crates before becoming a home-exterior giant. Its name was chosen to suggest a foundation, the "cornerstone," on which buildings rest.