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Old 01-25-2018, 10:17 PM   #16
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Re: Tile Shower / No Waterproof - Did my husband do this right?


If that mapei adhesive is anything like acrylpro, it'll be fine. Acrylpro is approved for use with shower and tub walls but not for submerging. The tub walls that were original to my 1970 built house were stuck onto plain old drywall with cutback. The previous owner was not one for maintenance so there was some mold/rot and deterioration where the grout had cracked and the caulk failed but otherwise was in good shape when I demo'd it with no major water issues. I find more and more, as I tear out others' work to upgrade/make modern, that the things that aren't supposed to work actually have held up surprisingly well over time. Not to say that I'd recommend doing half the stuff I uncover but it's held up somehow.

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Old 01-25-2018, 11:02 PM   #17
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Re: Tile Shower / No Waterproof - Did my husband do this right?


I was just in a home the other day and there was tile in the entry, into the kitchen and dining room. I complimented the homeowner on their choice and the gal told me they were disappointed because the grout was cracking up and falling out in places.

The installation was about 5 years old and I would bet that there was no mortar under the backerboard.

The reason I'm posting this is because this is another example of what happens when you don't adhere to installation instructions, try to do things as cheaply or as quickly as possible, or plain don't know the correct procedure.

This ends up really hurting the tile industry specifically and all trades in general.
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Old 01-26-2018, 04:58 AM   #18
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Re: Tile Shower / No Waterproof - Did my husband do this right?


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I would bet that there was no mortar under the backerboard.
Or the installation was made directly to the subfloor. I see that a lot. No cbu, no slip sheet and the tile and grout will release.
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Old 01-26-2018, 08:14 AM   #19
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Re: Tile Shower / No Waterproof - Did my husband do this right?


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Originally Posted by cleveman View Post
I was just in a home the other day and there was tile in the entry, into the kitchen and dining room. I complimented the homeowner on their choice and the gal told me they were disappointed because the grout was cracking up and falling out in places.

The installation was about 5 years old and I would bet that there was no mortar under the backerboard.

The reason I'm posting this is because this is another example of what happens when you don't adhere to installation instructions, try to do things as cheaply or as quickly as possible, or plain don't know the correct procedure.

This ends up really hurting the tile industry specifically and all trades in general.
What I find mostly is the floor should not have been laid to begin with because there was too much deflection.

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Old 01-26-2018, 08:58 AM   #20
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Re: Tile Shower / No Waterproof - Did my husband do this right?


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What I find mostly is the floor should not have been laid to begin with because there was too much deflection.

Interesting that the presence of drywall underneath the joists makes that much of a difference in deflection. I did not see this on any of the deflection calculators I found online.

Side note about the untaped seams. I just removed a shower where there were several horizontal cracks across several tiles. When I pulled it down, I found the cracks were along the CBU joints that were not taped.
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Old 01-26-2018, 09:25 PM   #21
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Re: Tile Shower / No Waterproof - Did my husband do this right?


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Originally Posted by 1995droptopz View Post
Interesting that the presence of drywall underneath the joists makes that much of a difference in deflection. I did not see this on any of the deflection calculators I found online.

Side note about the untaped seams. I just removed a shower where there were several horizontal cracks across several tiles. When I pulled it down, I found the cracks were along the CBU joints that were not taped.
This image is referring to allowable deflection, not saying that drywall will shore up the ceiling. If you have more deflection than this the drywall is liable to crack, if you don't have drywall to worry about, code will allow for more deflection.

OP's shower will probably outlast us all, but the moisture behind might spawn some fungus in the coming years. Not done right but don't count on a new one anytime soon.
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Old 02-08-2018, 02:57 AM   #22
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Re: Tile Shower / No Waterproof - Did my husband do this right?


I would think the tile would keep about all moisture out, assuming there is no constant moisture in the rear.
I have seen enough regular drywall used in high moisture areas that did just fine to say do not worry about it.
As long as the tile is grouted properly and behind the drywall is not exposed to extreme cold that would condense moisture I think you are fine.
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