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The kerdi membrane will probably do the same, and its regularly installed over drywall which is probably less stable. How to prep a shower for tile with Schluter Kerdi - TwoFeetFirst Kerdi vs Redguard cost breakdown. : r/HomeImprovement - reddit This will ensure a strong bond between the KERDI membrane and the substrate. When it comes to applying KERDI, however, it is advised to use a regular thinset that includes portland cement as its main component. Start by cleaning the cement board with a mineral oil soap; this will help reduce mold and mildew growth throughout the life of the shower. I would fear leaks in all corners of this shower. I have corrugated metal shower surround & grab bars. This allows the cement to properly hydrate, resulting in a strong, dense bond coat. Kerdi Membrane Over Plywood ThePlywood.com If you choose to use Aquadefense as a shower pan liner, be sure to continue it up the walls at least 6", tying into your waterproofing on the walls. Yes, you should prime drywall before installing KERDI in order to ensure proper adhesion and a successful installation. The back side of the drywall fails and it is just as bad or worse than if it had an issue on the tile side. Project Type: Tile / Category: Bathroom. It's not a matter of trusting the Kerdi. But there are downsides. Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. The type of bonding mortar used to apply KERDI must be suitable for the substrate and must penetrate and engage the membrane fleece. Its important to note that Kerdi membrane is not a structural base layer, so plywood should be installed and reinforced as necessary based on load requirements. Hi David. If you ensure that silicone goes in and that the thin-set and grout do not bind there you should be good to go. #4 You could be adding a good 1000 pounds to your install too. My floor tiles are 2" x 2"." - Lisa Jasper No - you can not use Kerdi Board on the floor. We think it is the cement board (Durock) sucking the moisture out of the unmodified thinset. Ditra is a 1/8-inch thick polyethylene membrane with a layer of anchoring fleece on the underside and a grid of square cavities on top. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin? When it comes to installation, a Schlter system is typically easier to install than a cement board, and it also allows for more design freedom as it does not require a traditional waterproof layer. I also used a larger sized trowel than the one recommend by Schluter. First, it's super lightweight compared with the rest. Needless to say, the drywall turned to mush. I just a few weeks ago put kerdi on top of hardi-board in my shower and it was PAINFUL! Also - use a good thinset. Sledge hammers for the floor, that might take a bit of time. Kerdi-Board is an extruded polystyrene foam panel, with reinforcing material on both sides, covered by fleece webbing for effective anchoring of thin-set mortar.