Mapeguard Pre-Formed Niche The Mapeguard Pre-Formed Niche is a lightweight, waterproof shower niche designed for fast, secure installation. Made from high-density XPS with a durable acrylic polymer coating, it installs flush within standard 2" x 4" walls and is ready for tiling without the need for mechanical fasteners. Features Constructed from high-density extruded polystyrene (XPS) Waterproof and resistant to mold and mildew Installs flush with 1/2" backer board in standard wall cavities No fasteners, flanges, or cross-bracing required Quick adhesive installation reduces labor time Seamless, tile-ready surface Available in multiple sizes for design flexibility Suitable for showers, steam rooms, and bathrooms