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The upstairs waterproofing is not done well, and it leaks along the gaps around the pipes, so I have to look for the upstairs.
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I've encountered this situation before, I want to use a high-flex waterproof coating, I use a Tex-high-flex nozzle waterproof, you can try it, TB has it.
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Is upstairs being renovated? It may be a leak.
The biggest reason is that the waterproofing is not done well, and the moisture returns.
This is the problem of the gap between the wall and the ground, no matter how good the waterproof is for a long time, there will always be water leakage, it is recommended to use glass glue to slip through the joints between the wall and the ground (the bathroom is mainly white with porcelain white glass glue, and the others are transparent).
It doesn't matter if the sink is not tiled, as long as it is waterproof when decorating.
This can only be carefully examined as follows to know where the root cause is: >>>More
If there is no such testing agency in the local area, then you can only contact your community property with your upstairs owner to overhaul and replace the pipe. Even if it is repaired, it must be waterproof upstairs, and it is inevitable that there will be water seepage on the floor if you don't live for a long time!