1/2" Mold and Moisture Resistant Drywall at. 1/2 x 4 x 8 Mold and Moisture Resistant Drywall (Actual Size "x48"x96") Model Number: Cost of Raw Materials, Cost of Land & Building, Cost of Plant & Machineries, Fixed Capital, Cement Water Proof Compound, Grinding of Graphite & Asbestos, GYPSUM BASED PRODUCTS (GYPSUM POWDER, GYPSUM BOARD & PVC.