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The reason you will get mildew on the tile in a shower is because the water is not draining or drying properly. This could be cause of the tile not being installed correctly with the correct slope on the tile floor.

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Regardless of what type of tile you install over your garage, none of the installations will be waterproof unless you waterproof under the tile first.

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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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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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The term mastic in the ceramic tile industry is an organic adhesive per ANSI A136.1. Type 1 and type 2 organic adhesives are to be used only in interior wall and ceilings with limited water exposure. Type 1 is more resistant to water than type 2 adhesives.

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When there is failure in a tile installation it is generally not due to one condition or deficiency, but rather due to several compounding deficiencies.

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Leaks sometimes are not easy to find. They can show up in one spot, but the source can come from another area far away.

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Yes, movement joints (expansion joints) should be at all plane transitions and where there are transitions from different substrates and materials. Door thresholds, wall penetrations around escutcheons, and light fixtures also should have resilient joints.

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