1. Check the flatness of the surface of the tile. Use a two-meter-long ruler as shown in the picture to make a 2mm error.
2, if there is empty drum tile, then it is easy to loosen, fall off, cracking, etc., and if the hole in the empty drum tiles in the future, this piece of tile is also very easy to break. So checking whether the tile has a hollow drum is an important step in acceptance: use a hammer (or a screwdriver, etc.) to hit the four corners of the tile and hear the middle of the empty sound, if there is an empty drum in the middle, or there are two corners More than one empty drum, it is best to put up the brick and re-post.
3, using a square ruler in the tile of the yin and yang angle test, allowing 3mm error.
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