GP Gypsum Glass Mat Sheathing - buildgp.com
Gypsum based structural sheathing is a panel-type material made of a noncombustible core, primarily gypsum, with a paper surfacing on the long edges, face, and back. It is also known as drywall, wallboard, or plasterboard. Gypsum sheathing is fire-resistant, sound-reducing, durable, economical, and versatile.