Tile and Stone Lippage: What is acceptable (and how do you ...
Calculating allowable tile lippage At the beginning of this article, the author stated allowable lippage is either 1 or 2 mm (1⁄32 or 1⁄16 in.), depending on the tile and the width of the grout joint, in additional to the inherent warpage of the tile manufactured in accordance with ANSI A137.1.