Schluter® KERDI-SHOWER Compensation Board
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- 1" (2.5 cm) version: Accommodates the adaptor ring height for KERDI-DRAIN-A and KERDI-LINE-A installations
- 3-1/2" (8.9 cm) version: Accommodates the drain body and waste pipe height for KERDI-DRAIN-H installations
- Ensures proper alignment and a flush installation with Schluter’s prefabricated shower trays
- Boards can be easily cut to size and multiple boards can be used to fit the size and shape of the shower
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Description
Description
Not every shower floor installation starts at the same height as the surrounding bathroom floor — and that height difference has to go somewhere. The KERDI-SHOWER Compensation Board (KERDI-SHOWER-CB) is a lightweight expanded polystyrene (EPS) board designed to make up the difference when your KERDI-SHOWER tray sits lower than adjacent flooring, or to provide a smooth transition between assemblies at different heights.
Available in two thicknesses to address different height differentials, the compensation board is easy to cut with a utility knife and integrates into the KERDI shower system without adhesives — just set in mortar like the tray itself.
When you need it
- The KERDI-SHOWER-T tray sets below bathroom floor level and a filler is needed at the perimeter
- Creating a gradual transition between the shower floor and bathroom tile at different finished heights
- Leveling out substrate irregularities at the perimeter of the shower tray before tiling
- Adding height to sections of the assembly to match existing flooring elevation
Key features
- Lightweight EPS foam — same material as the shower trays themselves
- Can be trimmed to any shape with a utility knife
- Fully compatible with KERDI waterproofing system
- Sets in thin-set mortar, tile directly over it after KERDI membrane application
What it pairs with
- KERDI-SHOWER-T, TT, LT, and LTS shower trays
- KERDI-SHOWER-R ramp (for sloped entry transitions in curbless designs)
- KERDI-BAND to seal the compensation board perimeter joint into the waterproofing envelope
Pro Tips
- Measure the height differential before ordering — the two available thicknesses cover different gaps. Combining boards is acceptable for larger differences
- Always include the compensation board area in your KERDI membrane waterproofing — it's part of the shower assembly and must be within the waterproof envelope
- Bond with the same thin-set as the tray (Schluter SET for concrete, ALL-SET for wood subfloors)
- If you're building a curbless shower and using a KERDI-SHOWER-TT (thin tray), the CB boards often aren't needed — the TT tray's reduced perimeter height is specifically designed to minimize this problem
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