1.1 This specification covers the installation of molded glass fiber reinforced gypsum (GRG) parts. 1.2 The values stated in either inch-pound units or SI (metric) are to be regarded separately as the standard. Within th This specification covers the installation of molded glass fiber reinforced gypsum (GRG) parts. Molded glass fiber reinforced gypsum parts shall conform to environment conditions, substrate preparation, installation, and finishing requirements specifie