Waterproof niches that are ready for tile. They can be installed in minutes without penetrations of the Niche. Available in a wide variety of sizes and styles. Designed to allow standard size tile to be installed without cutting. Made from extruded polystyrene (XPS) and coated with acrylic polymer finish. Adds thermal resistance (R value of 2.5 to 3.0). Adjustable shelves are included with select sized niches.*