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The sewer pipe below the first floor of your house is blocked, just find someone to unclog it.
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The sewer is clogged, unclog it.
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It should be water seepage, upstairs is estimated to be waterproof only partial, it is estimated that the bathroom is done, and the kitchen is not done.
It is recommended that the upstairs kitchen drain pipe be sealed.
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It should be a problem with the sewer, find the property and take a look.
You can ask a plumber to take a look.
For this phenomenon, the property should be held responsible. You pay the strata fee, wherein: There is a repair fund that is guaranteed by such terms of service. >>>More
Replace the deodorant floor drain or install an anti-water inlet.
If it's a leak from the upper floors, it's basically useless to fix it here, because the water will still leak down, and if you plug the leak now, it will inevitably leak in another place, or worse, it will spread between the floors, and the situation will be even worse. >>>More
Of course, the upstairs neighbor is responsible, you can find the upstairs neighbor, if you don't make repairs, call the police, and sue him if it doesn't work.