Waterproofing membranes are designed to provide a waterproof barrier beneath stone, ceramic or porcelain tile for wall and floor applications. Waterproofing materials include: liquid roller applied, prefabricated boards and trays, roll or sheet membranes to prefabricated niches. Terra Tile & Marble stocks several products from Dük Liner™, Johns Manville, Mapei and Schluter. We stock underlayment products for specific installations, including cement backer boards, GoBoard, thickset mortars, wire lath, uncoupling membranes and accessories from the following brands: Johns Manville, Mapei, National Gypsum and Schluter.