Sealed and 100% Waterproof: shower bays use XPS extruded foam board, cement mortar, waterproof coating triple waterproof substrate, 100% sealed and waterproof, which not only can protect the wall and extend the service life of the wall but also effectively prevent water penetration into the wall, keep the indoor dry and sanitary. Note: This product is not ready for direct use. Surface layer, such as tile, must be applied to the surface before use!!! High-Quality Material: The (HCFC-free) XPS extruded foam board is durable and not susceptible to decomposition, decay. At the same time, the XPS foam board is relatively lightweight and can be easily carried, lifted, and easy to place. In addition, movable partition (double layer) is included, easy for you to confidently DIY interior space