Commercial steam shower

Commercial steam showers are often found in health clubs, hotels, and spas, and offer a relaxing, therapeutic escape.

Commercial steam showers create some of the most demanding environments for superior waterproofing measures due to their extreme conditions: They generally cover more area, receive higher volumes of water, and are in virtually continuous use, compared to residential steam showers which are typically only used intermittently. These conditions mean commercial steam showers have less time to dry out between uses so the moisture management system must perform exceptionally well.

When not designed properly, commercial steam showers can allow for mold growth in wall cavities, for wood framing to rot, and for damage to occur in moisture-sensitive wall coverings on the opposite side of stud cavities. The KERDI-DS waterproofing membrane is specifically designed to manage both water and vapor in extreme conditions, making it the ideal solution for commercial steam showers. Check out the application below to learn more about KERDI-DS, and the other related KERDI components.

Commercial Steam Shower with KERDI-DS

1. KERDI-DS Waterproofing Membrane

The KERDI-DS waterproofing membrane is intended for use in commercial steam showers and should be applied to walls, ceiling, and floor surfaces to prevent moisture penetration.

KERDI-DS is 20-mil thick, over twice as thick as regular KERDI at 8-mil thick, and features additives to produce a water vapor permeance of 0.19 perms when tested according to ASTM E96, using procedure E at 90% relative humidity. This makes KERDI-DS the ideal bonded waterproofing membrane and vapor retarder for continuous-use steam rooms and other extreme applications with similarly high vapor levels.



Bonded waterproofing and vapor-retardant membrane


KERDI-BAND is a waterproofing strip used to seal all KERDI-DS seams, and floor-wall transitions. KERDI-BAND is only 4 one-thousands of an inch (4 mil) -thick, to limit buildup and ensure a smooth surface for tile installation.


Waterproofing strip seals abutting joints of membranes and building panels

3. Waterproofing Corners

KERDI-KERECK-F are preformed, seamless corners made of KERDI for waterproofing inside and outside corners. Corners tend to be challenging areas to waterproof, so these greatly simplify installation.


Preformed waterproofing corners

4. Pipe and Mixing Valve Seals

It is the specifier's responsibility to treat and address all penetrations through the KERDI-DS membrane (e.g., steam inlet, lights, etc.) in the installation. All penetrations must be treated with KERDI-FIX, KERDI-SEAL-PS/-MV seals, room temperature vulcanizing sealant, or other suitable sealant. Steam inlets must be treated only with room temperature vulcanizing sealant or other suitable sealant. KERDI-FIX is not suitable for use around the steam inlet.


Prefabricated seals for pipe protrusions


KERDI-DRAIN is a floor drain specifically designed to allow connections to KERDI and KERDI-DS bonded waterproofing membranes. In this commercial steam room application, KERDI-DS is adhered to the large integrated bonding flange to form a waterproof connection at the top of the drain assembly. The standard KERDI-DRAIN is attached directly to the waste line. The drain casing is available in ABS, PVC, or stainless steel.

Drain grates are available in stainless steel with a polished or oil-rubbed bronze finish and in anodized aluminum with a brushed copper bronze, brushed brass, or brushed nickel finish. The polished stainless steel grates are available in 4" (100 mm) -square, 6" (150 mm) -square and -round versions. There is also a tileable grate option available, which features KERDI laminated on the surface to allow for bonding of ceramic or stone tile to create a virtually invisible drainage line.

Drain Alternative:

The elegant KERDI-LINE linear drain.



Point drain with integrated bonding flange

6. KERDI-BOARD-SC Shower Curb

The KERDI-BOARD-SC shower curb featured here is one element of the full line of prefabricated substrates available that are lightweight, waterproof, and ready to tile.


Prefabricated waterproof shower curb


Also good to know...

Add a Bench!

Incorporate a prefabricated bench into your commercial steam shower, or build your own customized bench out of KERDI-BOARD


Add a ramp!

The KERDI-SHOWER-SR prefabricated shower ramp is specifically designed to facilitate the construction of access ramps for tiled showers. Similar to the shower tray, the shower ramp is lightweight and easy to install, and creates a gentle slope.


Explore these profiles:

Schluter ®-Systems profiles are ideal for commercial steam showers and may be used to finish and protect outside corners and eliminate the use of sealant at inside corners.



Finishing and edge-protection profile with a rounded reveal surface



Finishing and edge-protection profile with a squared reveal surface



Cove-shaped profile for inside wall corners and floor/wall transitions



Stainless steel cove-shaped profile with inverted anchoring leg