Regular Gypsum Board. Knauf Regular Gypsum Boards are the essential for standard lightweight drywall constructions and are used as the cladding component for: Drywall partitions using metal frames. Suspended ceilings using metal frames. Furring and wall linings. Prefabricated building units. Board Dimensions: Thickness : 6.5 / 9.5 / 12.5 / 15 mm.