What is the Stone Industry Standard for the Allowable amount of Marble Tile Lippage?

QUESTION

Is there an allowable amount of lip-age on polished Carrara marble tile floor installation 12x12 tile?

ANSWER

ANSWER - Per the Natural Stone Institute Dimension Stone Design Manual the tolerance for the allowable lippage for a for a calibrated marble or any calibrated natural stone floor tile is 1/32".  This is based on the grout joint width being at least 1/16" wide and preferably 1/8" wide.  The standards state that stone tiles should never be butted together.

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