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Just because your home isn't leaking doesn't mean there's no water leaking upstairs.
Maybe the faucet upstairs isn't turned off properly, it's possible.
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If there is no water in the room, it may be the sound of dripping water in the sewer pipe. Tell carefully.
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It is not ruled out that there is a possibility of water leakage upstairs and downstairs or in neighbors, after all, the pipelines are connected.
The brick is not pasted, the decoration of the bathroom is to pay the most attention, the back of the brick contains a lot of alkaline substances, the corrosion that flows out after the water enters, and the place where the water flows on the surface of the brick will form a yellow-brown band, which is ugly, and immediately solves the problem of water leakage, and the smell will soon be gone.
Depending on which one you buy, there are silent ones and there are ticking ones.
Dry the clothes that must be washed by hand slightly, then spread them on a thick dry towel (preferably a large bath towel), roll it up and pat it gently, absorb as much water as possible and then dry. There will be no dripping.
The waterproof is not done, my mother-in-law's house is also like this, downstairs leakage, and finally find a decoration company to decorate the house to deal with, next to the floor drain open the tile inside the water to dry up after doing a good job of waterproofing.
It should be that the waterproofing of your bathroom is not in place, and the water on the ground usually penetrates into the cement floor through the tiles.