This practice is very non-standard, mainly due to the following points:
1) Since tiles have variations in length, straightness, straightness, etc., there is no such thing as a ceramic tile that does not have any errors.
2) There will also be some errors in the construction process. Mechanized products will have errors, not to mention the manual operation of the shop's workers. Errors are even more difficult to avoid.
3) The most important point is: Any object has a thermal barrier shrinkage, tiles are no exception. If the gap is too small, the ability of the ceramic tile to adapt to the environment will be deteriorated. Due to the temperature change, the tile will be broken and the normal service life of the tile will be reduced. When tiles are under construction, leaving small joints is a major cause of cracking and arching of tiles.
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