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When there is a white haze on a shower floor it is normally either efflorescence precipitation or you have trapped moisture in the tile assembly by applying a non-breathable sealer over the floor.

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There are many variables to consider. First you have to know what type of tile was installed. Whether it is a glazed tile (impervious glass-like surface) or unglazed tile (same clay material form top to bottom). If it is an unglazed tile is it porous?

Ceramic and Porcelain TilecleaningExpert AnswersgroutMaintenanceStainsWet Areas
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If water from your shower is leaking into a crawl space the problem is not the cementitious grout joints. There has to be an underlying problem with the shower pan’s waterproof membrane.

Ceramic and Porcelain TileExpert AnswersfailuresgroutLeakMoisture ProblemsRepairsWet Areas
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The black stain in the water has to be coming from somewhere and caused by something. The question is where and what?

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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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There are acceptable methods for installing ceramic tile over wood substrates in interior dry applications. It is always considered better to install over a mortar bed or over one of the approved tile backer boards.

Ceramic and Porcelain TileExpert AnswersgroutinstallationWood Subfloor
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The leaking of deck causing damages in the ceiling below is the symptom of the cause of the problem. Treating the symptom will not remediate the cause of the problem.

Ceramic and Porcelain TilecracksExpert AnswersExteriorfailuresgroutinstallationLeakMoisture Problemsstone
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Grout joints within a tile installation are always going to vary to some degree as the installer makes adjustments for the sizing variation of the tile. Rectified tiles will be more consistent in sizing.

Ceramic and Porcelain TileExpert AnswersgroutinstallationMovement JointsStandards
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