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Old 12-29-2018, 06:41 PM   #1
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Tiling over painted sheetrock


Our DIY basement remodel is partially complete - except that I realized after-the-fact that drywall in the shower will be problematic and I already painted. We used a one-piece fiberglass tub/shower and there’s about 24 inches of painted Sheetrock between the top of the tub and the ceiling. The shower faucet is about 10” from the ceiling. It’s purple drywall that the drywall guys said is for use in bathrooms but I believe it’s going to get saturated.

I would like to somehow waterproof it and tile over it with white subway tiles. My husband says we cannot use Kerdi waterproof membrane because the drywall is painted and unmodified thinset will not adhere.

I think there has to be a way to make this area waterproof, I just don’t know what to do.

Any suggestions will be appreciated!
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Old 12-29-2018, 08:52 PM   #2
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Re: Tiling over painted sheetrock


You can't make sheetrock waterproof. However, if this is above the shower, it may not pose as much a problem as you think. It ideally should be concrete backer unerlayment or Kerdi (it will adhere just fine with thinset). Purple drywall is fine for bathrooms, but not for wet areas. Technically your area won't be a "wet" area, even though it may get splashed occasionally.
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Old 12-29-2018, 09:02 PM   #3
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Re: Tiling over painted sheetrock


RedGard it and go
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Old 12-30-2018, 06:38 AM   #4
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Re: Tiling over painted sheetrock


Tile gets installed over paint everyday although if the paint has a sheen it should be scuff sanded first. A good coat of latex enamel along with caulking between the drywall and tub surround should give you all the protection you need. Not trying to talk you out of tile - just saying it isn't necessarily needed.
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Old 12-30-2018, 09:48 AM   #5
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Re: Tiling over painted sheetrock


I agree with Texasdiyer, use RedGuard (found at Home Depot, Ace Hardware, Walmart, etc.) which creates a waterproof membrane then paint that and you should be fine.
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Old 12-30-2018, 10:06 AM   #6
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Re: Tiling over painted sheetrock


Quote:
Originally Posted by TheNexus View Post
I agree with Texasdiyer, use RedGuard (found at Home Depot, Ace Hardware, Walmart, etc.) which creates a waterproof membrane then paint that and you should be fine.
Never heard of that one...??????
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Old 12-30-2018, 10:56 AM   #7
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Re: Tiling over painted sheetrock


Redguard is not meant to be painted and used as a “wear” surface. It is a sub-strate membrane meant to get tile over it.
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Old 12-30-2018, 01:06 PM   #8
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Re: Tiling over painted sheetrock


Funny - I meant RedGard and then tile over it since that's what Jenn was asking about.

However, I have also painted over it as well with no issues.

I didn't want tile around my soaking tub so I hit the drywall with a couple coats of RedGard, sprayed on knockdown texture and then painted it. Likewise with drywall above shower tile up to ceiling - no issues.
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