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No, the minimum distance of the ceiling is 5-10CM
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The wall cabinet is only 3 cm away from the original roof.
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Do you mean that the ceiling height is only 3cm from the wall cabinet?
It doesn't matter, it's not the ground.
The back drainage and side drainage can be done, but the lower drainage is too far, the drainage will not be smooth, and it is easy to block.
The yin corner lines of each integrated ceiling manufacturer are different, the centimeter is more commonly used, and the 4 cm yin corner line is relatively rare, and the use of such a large line has the side effect of dominating the crowd. I hope my answer can help you.
For the height of the meter, if there is no drainage pipe, it is at least 10 cm to do an integrated ceiling, 5 cm can not be done at all, and 5 cm can be used as a gypsum board ceiling.
How can it be installed, it must be more than 420, and it is just put down after pasting the tiles. It is best to leave a small slit at 430 or above, so as not to be crowded.