Schluter Systems

Water and vapor penetrate through the grout joints (even sealed grout joints), mortar, and backing materials in shower walls and floors, allowing moisture to collect in the wall cavity or floor structure, which is the primary cause of mold growth. The Schluter® Shower System for ceramic tile installation eliminates the possibility of mold growth due to moisture penetration.

A major breakthrough for installers, the Schluter® Shower System permits the installation of ceramic tiles on shower walls constructed with standard drywall. Installers and do-it-yourselfers no longer need to use cement board or other specialized tile backers when installing ceramic tile showers and tub surrounds - even in the most demanding situations.

The Schluter® Shower System consists of four primary components: the prefabricated Schluter®-KERDI-SHOWER-ST tray, the Schluter®-KERDI-SHOWER-SC curb, the Schluter®-KERDI waterproofing membrane, and the Schluter®-KERDI-DRAIN. When used together, these components make installation much easier and eliminate the potential for the growth of mold and mildew.

The KERDI-SHOWER-ST tray and -SC curb were developed to allow the installation of a completely watertight shower without a mortar bed. Comprised of expanded polystyrene (EPS), they are lightweight and easy to install.

The KERDI-SHOWER-ST tray has a pre-sloped base and can be quickly cut to size and fixed in place using thin-set mortar. Total project time is dramatically reduced with the use of this tray and -SC curb because there is no longer time spent waiting for a mortar bed to cure.

KERDI is a sheet-applied waterproofing membrane made of pliable polyethylene that is covered on both sides with fleece webbing. The sheet is applied to the walls, corners, and floor of the shower using thin-set mortar in much the same way wallpaper is installed - without the challenge of matching patterns. KERDI must be overlapped by a minimum of 2 inches at all seams in order to create a totally watertight system. Tiles are then set directly onto the KERDI with thin-set mortar.

The exclusive KERDI-DRAIN is the critical component in the system, allowing a simple and secure connection to the KERDI at the top of the assembly rather than below it. The drain has a square grate-available in stainless steel, and anodized aluminum (with brass, nickel, and copper-bronze finishes)-which makes installation fast and easy.

The KERDI-DRAIN and KERDI waterproofing membrane can be used with either the KERDI-SHOWER-ST tray or a mortar bed. In traditional tiled shower installations, a mortar bed, over time, becomes saturated and can become a breeding ground for bacteria and mold. By using the KERDI-DRAIN and KERDI, the moisture is locked out of the mortar bed, thereby preventing efflorescence, and fungus and bacteria growth. The end result is a high-quality, maintenance-free shower enclosure.

KERDI and the KERDI-DRAIN are listed by UPC®. The UPC® listings recognize products that comply with BOTH the products' performance standards AND the Uniform Plumbing Code (UPC). These listings provide installers and inspection officials with an instantly recognizable indication of code compliance.

For more information on the Schluter® Shower System, to view our step-by-step installation video, and to learn about all of our innovative installation systems, please visit, or call our customer service representatives at 1-800-472-4588.