ARC TB5932-S 59-Inch x 32-1/4-Inch Tuff Form Shower Base Structural glass reinforced plastic spans 16 Inch on-center joist systems Supports up to 1,100 pounds (substructure must meet load standards) Order a waterproofing kit with each Tuff Form, model ARC566 or ARC565, which also includes a drain assembly for tile Use ceramic or glass tile, stone, or vinyl for surface covering Pre-pitched bases provide dependable water drainage and off-center drain hole permits repositioning of base for optimal orientation