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Yes, you should prime drywall before installing KERDI in order to ensure proper adhesion and a successful installation. This will help you achieve the best results and ensure the longevity of your project. Yes, you need waterproofing behind shower tile. Actually if you watch any pros work (not on crappy shows) on TV you will see them use backer board 99% of the time. LONDON. rev2023.3.3.43278. We also found that using a heavy rolling pin worked wonders for really setting the Kerdi. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? How to prep a shower for tile with Schluter Kerdi - TwoFeetFirst Hi David. Putting this stuff on walls is difficult and time . The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. This allows the cement to properly hydrate, resulting in To ensure the floor is clean, wipe it with a wet sponge. The 30-in. My idea is to block in and install the tub in the existing corner, erect the new wet wall, and use hardi-backer to shim the wall out over the tub flange, then apply kerdi over the whole thing.Does kerdi take offense at being installed over hardi? One thing I do like fibercement (Hardie) for is when I need thin strips of cement board. However, the answer you provided above suggests that the OP could omit a waterproof membrane, that I. There are many different types of underlayment to choose from, but they all serve the same purpose. Applying a conventional cement backer board to such a structure is almost impossible. Best substrate for kerdi membrane - nsbu.treviso-aug.it Will add it in. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); Your email address will not be published. Cement board is readily available and relatively inexpensive (about $10 for a 3 x 5-ft. sheet). How should I transition between cement board floor and alcove tub? The drywall's back side fails, and it's just as bad or worse than it was on the tile side. Once its cleaned, use caulk to seal all of the seams where the cement board meets the walls. The cement board needs to be clean, free of debris, and dry. While cement board may be the most common and widely-known tile substrate, Kerdi Board is giving it a run for its money. Kerdi 3 ft. 3 in. It is a topical waterproofing layer that is put over the substrate to keep water from getting to the wood frame and nails. Why does the plumbing rough need to be moved? But there are downsides. Kerdi Membrane Over Plywood ThePlywood.com To install Kerdi Membrane, start by applying Schulter ALL-SET mortar (or similar) to your cement board substrate using a 1/4" x 3/16" V-Notch Trowel. Ratings (91) (5) (91) (3 . We are still most comfortable with full plumber's pan over the curb, including glue-on preformed corners, and also a second layer (usually Kerdi but can be paint-on) on top of CBU wrap over curb. A quality underlayment will also serve as a waterproof barrier between the subfloor and the tile surface.