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It may be that the sewer is blocked, let the property take a look, and you can't draw conclusions before you check it.
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That's for sure, they have a responsibility to help solve the problem.
Your house is on the first floor, and the sewer pipe is single, not connected to the upstairs, so you can plug the floor drain of your home without affecting the upstairs use. You're going to have to do the drain separately, as long as the property agrees you can do it.
In the spring, when the weather changes, the air humidity is very high, sometimes reaching 90% to 95%. >>>More
Buy an anti-back valve, plug it in and it won't get water on it.
First of all, this gap is indeed large, and it belongs to the mistake of the bricklayer master's craftsmanship; >>>More
I guess your sewer is blocked, and the upstairs can't go down, so it will come back up through your drain hole.