Knauf Moisture & Mold Resistant Gypsum Boards are ASTM C 1396 & D 3273 compliant mold resistant gypsum boards, specifically designed for use in areas with humidity and exposure to moisture or mold. They have also been certified as T ype X (Special Fire Resistant) compliant boards as defined by ASTM C 1396. Field of Application: Knauf Gypsum Boards are high performance gypsum boards used as the cladding component of drywall constructions in humid areas with exposure to mold such as: Partition or Ceiling of Kitchens/Bathrooms Wall Linings/Furring in Kitchens/Bathrooms Partition with tiled nish requirements Any internal area which is exposed to humidity or mold.