Where Kerdi Board Meets Drywall Waterproofing

[LLPA]

I'm not entirely sure how to handle the waterproofing in the seams on this slanted ceiling where Kerdi meets the drywall?
Do I overlap the Kerdi band and then have to smooth out the thinset and paint over it?
My contractor did the drywall, I'm finishing the shower with Kerdi, etc.
What about the waterproofing of the drywall just below skylight above the seat? Thank you!
See photos:

 

[wwhitney]

The Kerdi should cover the entire "wet area" and then go somewhat beyond. The resulting joint from Kerdi to drywall doesn't need waterproofing, as it shouldn't get wet. This is true at the small level ceiling at the top right.

As for the sloped ceiling, seems to me it may be prudent to consider it part of the wet area, and to cover that drywall with Kerdi. Possibly also the light shaft walls.

Cheers, Wayne

 

[Sponsor]

 

[CENTRALFL]

I would say you could use Kerdi fabric on the slanted section. Reading around, you should waterproof 6 ft above the finished floor, which your bare drywall appears to fall in.

I'd say hop over to the John Bridge tile forum for a more thorough answer.

 

[LLPA]

I would say you could use Kerdi fabric on the slanted section. Reading around, you should waterproof 6 ft above the finished floor, which your bare drywall appears to fall in.

I'd say hop over to the John Bridge tile forum for a more thorough answer.

Thank you! Interesting idea with the fabric. But I guess then I'd still have to tile all or part of that slanted wall...which I was hoping not to do.

 

[LLPA]

I would say you could use Kerdi fabric on the slanted section. Reading around, you should waterproof 6 ft above the finished floor, which your bare drywall appears to fall in.

I'd say hop over to the John Bridge tile forum for a more thorough answer.

I will try John Bridge too..thank you.

 

[Chucky_ott]

I too was going to recommend John Bridge.

Considering the location of the shower head, I would also waterproof that sloped ceiling and window opening like WW suggests. And other than tile, not sure how you can coat Kerdi.

 

[Jsmallberries]

What happened to the John Bridge tile forum? No access for 2 weeks now. Project stalled, but if they come back on they will guide you through any thing related to tile installs.

 

[LLPA]

What happened to the John Bridge tile forum? No access for 2 weeks now. Project stalled, but if they come back on they will guide you through any thing related to tile installs.

They've been helping me over there and were active last week and now again just yesterday.
The basic consensus was I need to prime the drywall and then add thinset and kerdi membrane to sloping wall and flat ceiling and tile it all.