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Flooring tiles,wall tiles will also be influenced by paving material.
In the hollow and non-empty drum sections, the expansion coefficients of the mortar and the tile are different, causing the tile to deform and crack.
Phenomenon: The cracked tiles are irregularly distributed, the cracks are not regular, and the cracks are linear and vary in length.
Resolving method: Take a coin to hit the surface of the tile, listen to the sound, see if it is empty? The knocking sound is low and boring, that is, empty.