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Try to do waterproofing in slotted and other places, otherwise waterproofing is equal to white.
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Facade waterproofing is to prevent water from entering the wall, and knowing this, you know what to do.
I have some governance methods in my space, see if it's okay.
Check whether there are leaks in the water pipes embedded in the wall!
Such a leak may have leaked from the upstairs floor bath, now that the weather has gradually warmed upstairs, and the upstairs is about to start bathing again, you have to go upstairs and urge them to check carefully and fix the leak.
It is the caulk used, the surface of the caulk is too rough, easy to seep, moldy, although there is an anti-mildew caulk on the market, but it will still be black seams, the waterproof problem of raw materials is not solved, the black seams can not be completely solved, now there is a kind of mandala beauty grout on the market can solve the problem of dirty and black tile joints, this kind of beauty grout, and the same smooth and dense as the tile, the oil can not penetrate into the gaps, and the floor can be wiped clean by the way, I saw this product at a friend's house last year, Taobao and building materials markets should have sales.
As long as it is not installed on the pipe, remember, be sure to do a good job of waterproofing.