Waterproof 2" Building PanelMulti functional tile substrate and building panel, which can also be used for creating bonded waterproofing assemblies with tile coverings. It consists of an extruded polystyrene foam panel, with a special reinforcement material on both sides and fleece webbing for effective anchoring in thin set mortar. Can be used in a multitude of interior applications, not intended for exterior applications. Allows the installer to prepare and create a broad