Schluter is well aware that there are many, many modified thinset mortars available that will work just fine with their products and, indeed, they even make one that they recommend and charge a premium for. Given that all CBU manufacturers, and all other direct bonded waterproofing membrane manufacturers (ANSI A118.10) recommend the use of a modified thinset mortar (ANSI A118.4), that would be my choice here. But since you've elected to use a CBU as your backing material, you have a choice of which manufacturer's recommendations to follow. In this case, if you were to use gypsum drywall, as Schluter recommends, you'd use their choice of thinset mortar (well, you could). When you start mixing methods and materials, you frequently will encounter conflicts among the various manufacturer's recommendations. I've combined you with your original thread for continuity and so folks can see what you're working on and what's been previously asked and answered. Apply Porcelain wall tiles with modified thinset. I won't go into lifting the drain but there are kits and DIY videos on successful ways to do this and not get any leaking.Ĩ. Apply unmodified thinset over membrane and lay stone floor stones. I could paint the Aqua defense on the entire floor pan which would be extra protection but it may be needless.ħ. Use Kerdi corners and a 2" overlap where the wall meets floor and tie in curb via Schluter videos. Apply Schluter unmodified thinset to floor- cut Kerdi membrane to floor and install. Not sure if I should put two coats on the floor tile.Ħ. Paint all seams, screw heads with Aqua Defense. Kerdi likes unmodified while Hardi wants modified thinset so the primer should allow the unmodified to stick to the hardi. Sand floor with 100 grit orbital sander, hand sand grout lines, vacuum -wipe with denatured alcohol, apply Mapei primer to floor tiles and 6" off floor on walls. First - run the hardi board with hydro defense 1/4" off floor. Use Aqua defense on all mesh taped areas.ĥ. Use mesh tape and modified thinset to "seal" counter sink screw heads and seams.ģ. leaving an 1/8 size gap between boards to allow for movement. Install Hardi board with Hydo defense on walls. I also am on a budget so I don't want to put in a Kerdi drain pan which would allow me to trim to fit to existing drain.Ģ. Remove everything but keep the floor since it will be a huge hassle to get to the drain pipe to move it. Don't shoot me but would love to get feedback with the materials that I want to use.ġ. The floor seems very solid and doesn't leak. Under the granite is old school hardi board. Currently we have granite slabs on our shower walls and a slate shower floor that slopes to the middle and a wood curb. I am doing a tear out and remodeling of our bathroom which is 15 years old and inherited with house. I'm a DIY person who has successfully tiled before (years ago) and am very capable with tools and thinking out of the box. I was originally going to install Kerdi but its hard to get in my area and the big box stores that sell it have most of the boards ripped up. I've been reading like crazy trying to understand best practices for my install.
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