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First go downstairs to see, see the main location of the water seepage, and then use a sharp iron tool to beat off the cement at the water seepage position of your own house, if the place is very small, buy some ring resin AB glue to mix and make up, if the big house leakage professionals!
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Pry it off and redo it waterproof. Don't be too troublesome, don't be stingy, this is the only way to solve the problem.
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It should be a waterproof problem, and the waterproofing of the bathroom must be redone.
It is not recommended to construct from downstairs, and it is not recommended to use grouting waterproofing for backwater construction from downstairs construction, and it is not recommended to use it to treat the symptoms but not the root cause; >>>More
If you don't want to dig tiles and redo waterproofing, you have to find an easy way. >>>More
First of all, determine whether the wall seam seepage goes down, and to understand whether the bathroom is sunken, whether the waterproofing of the bottom plate below has been done, you can first use epoxy seam glue caulking to see the effect, if it is a small area of water seepage of a single-layer prefabricated board, you can also use UD001 high-strength special impermeable material on the ceiling roof downstairs to do the backwater surface impermeability, and the specific implementation requires a professional waterproof plugging master.
It's okay, because the cracks are unimpeded when the tiles are opened, so the watermark is big, and I will look at it every two or three days after doing waterproofing, and there should be no more water seepage, if the water seeps again, it is not good to be waterproof.
It does not mean that there is no problem, it is recommended that you and the upstairs are looking for a professional decoration company.