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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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When there isn’t a white coating on the back of the glass tile, then the installer has to make sure the thin-set mortar adhesive is a uniform color and that the thin-set mortar is applied with continuous flat manner.

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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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