Knauf Regular Gypsum Boards are ASTM C 1396 compliant gypsum boards specifically designed for use where high quality gypsum boards requirements are essential to achieve the desired interior design intent. Field of Application: Knauf Regular Gypsum Boards are the essential component for standard lightweight drywall constructions and are used as the cladding component for: Drywall partitions using metal or wooden frames Suspended ceilings using metal or wooden frames Furring and wall linings Prefabricated building units Drylining blockwork/concrete walls using dot and dab of a gypsum based bonding compound.