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I encountered such a case some time ago: the second decoration, the original sewage pipe is an iron pipe, the worker did not remove the squatting toilet when dismantling, and there are porcelain blocks on the iron pipe directly connected with PVC110 sewage pipe, and then sealed with cement, the problem is that the toilet flush can not be flushed, and it will backwater, so the dirt will benefit from the bottom of the toilet.
My solution was: take it out, disassemble it, connect it to the PVC110 pipe, seal it with glue, and seal it with expanded cement on the outside.
Result: Mess up.
Your upstairs should be renovated, according to what you said, there must be a problem with the caisson inside.
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Waterproofing is not done. It is very likely that it is leaking from that pVC110 pipe under the toilet.
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Your waterproofing is made of the surface, since you have tried the water, there will be no problem. The problem should be in the sewer pipe, which leaks and then penetrates the floor slab of the toilet settling tank to the downstairs. These are below the surface waterproofing layer!
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The drain under the toilet is blocked.
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Just look at it. If you want to have an "experience brainstorm, you must first register as a Baker" to enjoy!
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Just find a plumber.
We can also solve it, 0451-84222233
There is a kind of (waterproof plugging agent) that sells building materials on the market, like cement, and it can be applied on it.
1.See if you have the ability or basic knowledge of this area; >>>More
After wiping dry, use AB glue, which can be used in half an hour (there can be no water in the place where there is glue within half an hour).
Judging from your description, the leakage is caused by the non-standard waterproofing treatment of the stone at the door of the bathroom. >>>More
If the leakage point is the position of the pipe through the floor, it is easy to do, clean up the hole edge of the floor drain and so on, and then do a waterproof, and then plug the hole after it is dry, and the ground is water-raising for 24 hours, there is no water trace downstairs, and then reinstall the toilet floor drain. >>>More