How acceptable is warped tile?
Warpage is curvature in the face of a tile which can be concave or convex in shape. As well as porcelain stoneware tile is made from natural materials (clay, feldspar, sand, etc.), during the firing and cooling process of production, a tile can get a light curvature. For example, the curvature is more noticeable on wood effect porcelain stoneware tiles presented in long and narrow formats like 20x120 and 22.5x90.
In any case, a light warpage is acceptable and it does not interfere with the perfect laying, but it is important to use any tile alignment system. A whole range of the Italon products porcelain stoneware and ceramic tiles comply with ISO 10545-2 standards