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Large rectangular tiles tend to have warpage at their corners and at the center of the tile, so when two adjacent tiles are off-set from each other then you can get compounding warpage.

Ceramic and Porcelain TileExpert AnswersLippage
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Installing the long and thin in width tile planks is a difficult installation because these tiles do tend to have warpage and the shapes of the tiles being off-set from each other with narrow grout joints is challenging.

Ceramic and Porcelain TileExpert AnswersLippageStandards
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Expansion joints, which is a type of movement joint, may or may be required in a tile installation. But always there should be some type of a movement joint installed in all tile applications per industry standards.

Ceramic and Porcelain TileExpert AnswersHollow Sounding TilesinstallationLippageMovement JointsStandards
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Allowable tile lippage for ceramic tile, including porcelain tile, which is a type of ceramic tile, is based on the grout joint width and the amount of allowable warpage that the tile itself exhibits.

Ceramic and Porcelain TileExpert AnswersinstallationLippageStandardsstone
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For ceramic tile, or porcelain tile that is a type of ceramic tile, there are standards for what is acceptable tile lippage. Tile lippage is the vertical displacement between two adjacent tile edges.

Ceramic and Porcelain TileExpert AnswersinstallationLippage
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Industry standards do not recommend butting tiles together whether they are a stone tile or a ceramic tile.

Expert AnswersgroutinstallationLippageStandardsstone
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According to the Marble Institute of America (MIA), on smooth surface stones, lippage should be limited to +/- 1/32″.

Expert AnswersgroutinstallationInteriorLippagestone
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