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Old 01-17-2019, 12:06 PM   #16
Jim Farrell Tiler
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there is a post on JB forums from someone saying you dont need waterproofing ....seems he was wrong
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Old 01-17-2019, 12:46 PM   #17
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Just noticed that the OP has been here in the past and not taken advice regarding his tile on drywall shower assembly.

I think the grout falling out and tiles 'flexing' back in 2010 was a clear indication that there was a problem with the installation. I am surprised that the shower has lasted this long and not fallen through what's left of the subfloor.

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Old 01-17-2019, 04:37 PM   #18
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There's only one answer to this shower. And you already know what it is. As far as matching the tile, don't try! Put and accent piece or some kind of trim in, and make it look like a feature. Better than rotting the house out.
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Old 01-17-2019, 07:43 PM   #19
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Quote:
Originally Posted by Jim
there is a post on JB forums from someone saying you dont need waterproofing ....seems he was wrong
Technically, the only part that needs to be waterPROOF is the pan...the rest needs to be built so moisture won't cause damage...drywall, unprotected, doesn't cut it.
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Old 01-19-2019, 12:23 AM   #20
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So this would be a great example of what happens when you put tile over drywall in a shower without red guard, ditra. I wonder if the drywall had no gap and was resting on pan


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Old 01-19-2019, 01:29 AM   #21
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So this would be a great example of what happens when you put tile over drywall in a shower without red guard, ditra. I wonder if the drywall had no gap and was resting on pan
There are only two companies that have tested their waterproofing for use over drywall and both of them are sheet membranes, not liquid. RedGard can be used over cbu, but not drywall.

Ditra is not designed for use in a shower, and shouldn't be used there...the pockets could collect water and not drain. Kerdi is needed there.
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Old 01-19-2019, 07:33 PM   #22
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Everyone here is right about the repair only being temporary but if you remove the tile so that all the damaged drywall is gone, and carefully soak or sand off the backs of the tiles to clean them I would thoroughly dry out the area behind the tile replace the drywall with cement board, Force some exterior grade construction adhesive between the cement board and clean cut drywall , then carefully replace the tile with thinset..... realistically if the tile has been there for some time before this happened you should actually be able to get at least that much more time out of it with doing a good repair, even though the installation wasn't originally done properly
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Old 01-19-2019, 07:35 PM   #23
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And also rolling on some redgard or hydro ban wouldn't be a bad idea either
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Old 01-19-2019, 08:19 PM   #24
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You could use KerdiBoard or WediBoard instead of cbu and have waterPROOF walls rather than water resistant ones.
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