While thin-set mortar handles the bonding of the KERDI membrane to the substrate, it is not designed to waterproof the junctions where the membrane meets plumbing fixtures or other materials. KERDI-FIX is a silane-modified polymer sealant engineered for these difficult spots. It provides a waterproof, flexible seal around pipe penetrations, shower valves, and the edges of metal drain flanges—places where mortar would either not stick or not provide the necessary flexibility to handle slight plumbing movement. Unlike traditional silicone, KERDI-FIX is formulated to bond aggressively with the fleece surface of the KERDI membrane. This ensures an airtight and watertight connection that remains durable under the constant moisture and thermal cycles of a shower. Improperly sealed pipe penetrations are a leading cause of behind-the-wall leaks in showers. Using KERDI-FIX at these points is a critical step in finalizing the shower’s waterproofing and ensures that the entire system remains secure for the life of the installation.
Key considerations
- what is KERDI-FIX
- sealing shower pipes
- waterproof sealant for shower
- KERDI-FIX
- Sealing
- Waterproofing