Everbuild aquaseal waterproof tanking membrane everbuild aqwrsmem5 aquaseal waterproof tanking membrane is the ideal product for use on showers wet rooms and wet zones in bathrooms when waterproofing before tiling it forms a permanently flexible watertight membrane and is non hazardous and solvent free aquaseal waterproof tanking membrane can be used with underfloor heating on plasterboard mdf plywood cementitious boards blockwork concrete and speciality wet room boards aquaseal wat