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Your engineer was basically saying that you have a high water table, meaning that the underground water is very close to the surface of the ground.

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First of all if it was installed correctly you wouldn’t have a problem. To fully figure it out I would have to perform a forensic intrusive inspection, which probably isn’t practical for a small shower.

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For an ADA shower you can’t have a curb/dam. You need a minimum slope to drain of ¼” per foot and no more than ½” per foot. You need a two part drain with weeps for the primary waterproof membrane to clamp to.

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Xypex is suppose to waterproof the concrete. So in theory it should prevent moisture migration in the concrete wall to help reduce the possibility of efflorescence.

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Patching the grout joints to stop the leak is a band aide approach. It does not fix the problem, rather it is only fixing the symptom of the problem.

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Exterior decks are one of the most common failures in building construction because they are normally constructed incorrectly.

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I’m guessing that the terrazzo floor is the cementitious type and not the epoxy type, but either way, f the terrazzo floor was originally installed correctly, it should not have been harmed by the flood.

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There should be a water proof membrane on the shower floor and walls, and it needs to be installed correctly with the appropriate transitions and slopes to drain.

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My granite shower bench had a negative slope when installed and my builder had it taken out and replaced. However in doing so the green board that was underneath came off with the old seat. As a result they cut out and around the torn green board leaving exposed drywall edges around the seat area and simply dropped in a piece of cement board, put down mortar and replaced the granite bench. To further complicate things,

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How do you waterproof a tile floor that is already installed? – trying to waterproof 18 x18 inch ceramic tiles on bathroom floors. spills are passing through to the floor below.

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