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I have laid rectified tiles 15x60. However, when a level is placed on the small part of the tile, a gap of light appears, as if the tile were curved (a few mm, with the lower part in the middle). There is a bridge effect in the connection with the other tiles, even if the joint is about 2 mm. After about 4 years I would like to change the tiles, what do you suggest? I would install a rectified tile, for having a homogenous floor. Is it possible to avoid this kind of inconvenience? Thanks 

Regarding your request, we would like to point out that this kind of anomaly is a problem of many productions of narrow and long porcelain stoneware, due to the tensions during cooking (1220/1250 ° degrees), which often lead to rectangular formats to be concave or convex.

For remedying this problem, at least ten years ago, levellers for laying were born; on Youtube, typing "levellers for laying", you can download several videos, which will clarify how the layer, who laid the floor, could have avoided this problem, having all the porcelain stoneware an unexpected degree of elasticity.

For your new flooring, the advice is to use rectified materials and to lean on an layer with a higher degree of professionalism than the previous one. By using the tools I have recommended, he will create a plane and perfect floor.

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