PreFormed Shower Pans are made from high-density polystyrene, ProTEC™ Concrete Backerboard side walls, and wrapped in fiberglass mesh with a liquid-applied waterproof coating. Shower pans come standard with the code-required slope, integrated drain assembly and curb built-in. PreFormed Pans are ready-to-tile and UPC rated. They are available in standard and custom sizes.