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Old 09-28-2014, 11:29 AM   #1
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Uh oh...kerdi newbie mistake?


I am trying kerdi membrane in a small shower for the first time. I installed all new drywall - however - the existing (bordering) drywall is textured and the new stuff did not sit flush. So I transitioned (feathered) with joint compound. Was about 1/16 off - but now I have Joint Compound over about 12" of the new drywall on the edges.

Of course I now find out that joint compound is NOT good when installing Kerdi membrane / thinset. I now know I should have used shims (or thinset).

Am I looking at having to tear out the new drywall or is it possible to paint/prime the joint compound so it will bond with the thinset and kerdi?

Thanks in advance for the knowledge.
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Old 09-28-2014, 02:39 PM   #2
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I can't say how water proof the kerdi will remain. Many people seem to think you can't use kerdi on a sheetrock, but that is a puzzle since kerdi is claiming solid water proof membrane.

However, I think you can prime and use thinset over the compound. Prime and then paint red vapor barrier over the area (I forget the name). Although I used Durock, I did the transition with compound and red paint on VP. Then used thin set for 3x12 marble tiles. No problem 5 years counting.
Before the cement boards, tilers were using thinset on sheetrock. I can't speak for longevity, but it does work.
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Old 09-28-2014, 02:51 PM   #3
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Thanks for the advice.

Kerdi actually recommends drywall so I am not worried about the actual drywall. Just worried about the interaction between the joint compound and the thinset I will use to apply the kerdi.

Think I will try to remove as much of the joint compound as possible and then use your suggestion (prime/paint) what remains.

Thanks again
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Old 09-29-2014, 03:11 PM   #4
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Quote:
Originally Posted by Schuby99 View Post
Thanks for the advice.

Kerdi actually recommends drywall so I am not worried about the actual drywall. Just worried about the interaction between the joint compound and the thinset I will use to apply the kerdi.

Think I will try to remove as much of the joint compound as possible and then use your suggestion (prime/paint) what remains.

Thanks again
Paint over the joint compound with any of the liquid waterproofing membranes like Redgard. You'll be fine. You could also use an exterior primer paint or even shellac. Then install the KERDI.
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