Waterproofing help.

6 years ago

Working on a 7ft wide 4ft deep, curbless (quickdrain trench) shower with 2 walls that are 2x4 framed wall studs and 1 exterior wall on the right 4ft side that is concrete block. It has been suggested to me to use Wedi board. I need to Wedi the exterior wall correct? I was told to furring strip the wall then attach Wedi board to the wood furring strip. DH sees no point in Wedi the exterior wall (hum) suggested red guard. Now I have 3 different materials going on here? I am pretty sure you will veto the DH suggestion.

When I do the Niches I just cut pieces and do inside of niche and then cut the hole out of the wall board so that raw edges are covered but what about the raw edges of the wall board? Do I need to cover this like the Kerdi method. I am familiar with the Kerdi on Durrock process. Or just a thought what if I used kerdi around the niche edge. I can't remember if I used Durrock in my Niches before or I went right to the 2x wood. Whatever I did, I asked first.

I know they frown upon mixing materials. Please explain. So I entered into this project planning on doing it the way I did the others and now I am totally confused. Suggestions appreciated thank you.

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Comments (8)

jjaazzy
Original Author
6 years ago
Ok, I see now how to do the Niche and the heavy use of Caulk, So my question about the concrete wall remains.
PRO
Creative Tile Eastern CT
6 years ago
Foam boards such as Wedi, Laticrete, Kerdi and many others can be spot bonded to the concrete wall. No furring strips needed. This also allows you to plumb the wall boards. Contact wallboard manufacturer for their specific instructions. Keep in mind not all foam boards are created equal. Research.
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PRO
Joseph Corlett, LLC
6 years ago
Don't mix materials, please.
PRO
Creative Tile Eastern CT
6 years ago
last modified: 6 years ago
"If we’re still on Wedi how would you attach?"

According to the manufacturers approved methods as I stated above.

Attached is a link showing the method I'm referring to. I'm NOT recommending the board used in the video.

https://www.google.com/search?source=hp&ei=izjJXt_aCouEtQX8rqSQBw&q=spot+bond+kerdi+board+installation&oq=spot+bond+kerdiboard&gs_lcp=CgZwc3ktYWIQARgDMgcIIRAKEKABMgUIIRCrAjIFCCEQqwIyBQghEKsCOgIIADoFCAAQgwE6BggAEBYQHjoICAAQFhAKEB46BQghEKABUOQMWPlaYPCOAWgAcAB4AIABkgGIAbUQkgEEOS4xMZgBAKABAaoBB2d3cy13aXo&sclient=psy-ab#kpvalbx=_njjJXsVzhJS0BviPlHA26
jjaazzy
Original Author
6 years ago
Thank you Creative, I will do some additional research on which boards to use. And thank you for the fantastic video of attachment, that makes a lot of sense and looks very secure.
PRO
Creative Tile Eastern CT
6 years ago
last modified: 6 years ago
My Wedi rep just got back to me. He stated they approve the full spread method. The thinner Wedi board would also work and save you some $$. Call them to get your own verification as I'm just a guy on a public forum. Always for any product go directly to the manufacturer. That's what I do. Good luck with your project.
jjaazzy
Original Author
6 years ago
Creative, I can't thank you enough, for asking Wedi for me, I am getting really frustrated with this process and considering going back to the Durrock, Kerdi sheet membrane method. An Animal that I know. I appreciate you getting back to me, it's been radio silence on John Bridge and I am not sure if it is because I mentioned a competing product or what. I just want to do it right whatever that is. I will phone Wedi again on Tuesday.
User
6 years ago
https://www.ceramictilefoundation.org/homeowners-guide-to-hiring-qualified-tile-installer