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I appreciate your help and your quick response. . In a perfect job, it will waterproof. Kerdi Board panels have a number of other advantages: they can be cut to size using an ordinary utility knife, can be glued or screwed into place, and are very lightweight. What? Good luck with your project. @JimmyFix-it - You are right. When applying the thin-set, it should be applied in such a way that it fully fills any empty space between the Tile and Schluter product and is solid enough to support the weight of the tiles being installed. It is lightweight and made of expanded polystyrene. #3 This is a DIY site. 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. RedGard, on the other hand, is a liquid waterproofing membrane made by Custom Building Products. Furthermore, if you're working in an older home KERDI-BOARD fits better than cement board in odd spaces. Once its cleaned, use caulk to seal all of the seams where the cement board meets the walls. Allow the adhesive to cure for the amount of time recommended by the adhesives manufacturer. I agree that gypsum seems very questionable anywhere in the wet areas of a shower. Step 6: Choosing the Next Tile. Plus, if you use the mold and moisture resistant drywall, it will be extra insurance against mold. The colour is different. A good rule of thumb is 24 hours per inch of thickness, then one more day on top of that to be sure. Cementboard sufficient to a tub surround is dirt cheap .vs. Slap it up comb it out, leave every ridge tall and perfect. A 1/2-inch thick, 3 x 5 foot sheet weighs just 7-1/2 pounds, compared with 45 pounds for a similar size sheet of cement board. See the foam bench and the corners. 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? If a pipe or faucet ever leaks in the wall this will ruin your shower. Hi David. 4. Is it ok to fasten a shower surround to Schluter Kerdi curb? Is this overkill? First, you would waterproof with your favorite liquid waterproofing membrane of . The cement board core itself is not waterproof, but it can withstand water without falling apart. The use of modified thinset adhesive could result in an inadequate bond and could lead to possible delamination. Kerdi board, on the other hand, is an extruded polystyrene foam panel. If you are laying tile on floors that are wavy or out of level, self-leveling underlayment is a great solution. The manual can be found here: http://floorelf.com/waterproof, I would say unless you are experienced in working with Schluter-Kerdi waterproofing membrane kit, then I would say work with an easier waterproofing approach, either liquid waterproofing or a combination of liquid and traditional waterproofing (plastic covering the wood frame). More waste, yes, but I think you have to have a LOT of practice to hang those huge sheets like mongo does. The Kerdi membrane should be applied with the standard procedure, using a hogg brush or a notched trowel to spread the thin-set mortar and a roller to ensure appropriate adhesion. It works well, is what Schluter recommends and I've never had an issue with it. What do you mean it doesn't adhere? Preparing drywall for KERDI membrane requires a few important steps to ensure a successful application.