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Talk to them, and if they can't, find the neighborhood committee for adjustment.
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It should be a plumbing problem, check the U-shaped pipe of your kitchen sewer pipe, there is a lid there that can be unscrewed, and see if something is blocked.
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Surely the pipes below your house are blocked somewhere......
That could be a problem with the floor drain in your bathroom that doesn't isolate the smell.
You can contact the property staff, and then contact the owner upstairs through the property to solve the problem of kitchen sewage together.
The kitchen waste pipe does not need to go to the roof.
Now it is not a question of who is responsible, but of solving the problem. This pipeline repair is actually very simple, find a plumber for 50 yuan to repair it. Why do you have to make it so scheming and earth-shattering? >>>More
If you can prove that there is no waterproof upstairs that caused your home to be soaked in pictures, audio recordings, and third-party evidence, you can sue the court directly.