Saint-Gobain Sheathing products are installed on the exterior of a building and provide long-term protection to weather exposure during construction. Our high-performing, gypsum-based sheathing features EGRG technology – which consists of reinforcing glass mats that are fully embedded into a water-resistant gypsum core and positioned beneath a paperless polymer-modified gypsum surface. This lightweight sheathing cuts like regular gypsum board and is covered in a protective acrylic coating, making it easy to handle and install for superior weather-, moisture- and fire-resistance.