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If you pay the property fee, you can't, but if you don't pay it, you can't.
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Let's find a major in things.
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Just ask the property.
Regardless of such a thing by the police, you can go to the property management department of the housing authority where you are located to complain about the property's inaction.
Because they are all commercial houses now, if there is a problem with the internal facilities after buying a house, they should find someone to repair and pay for it. If there is a problem with the common part of the wall, the property department will be responsible for repairing.
I have encountered your situation, the bathroom leakage should be found upstairs. Property says they don't care about it. They will coordinate the two of you. (I mean upstairs resigned to his faults and ignored them).
This has nothing to do with the property, and the upstairs owner is responsible for the water leakage after the house is renovated. Let the upstairs be repaired.
Yes, the cavity can be used to carry out grouting on the lower floor slab, and the material penetrates deep into the cracks of the building to form a waterproof layer to seal the fingers smoothly and only wax plugging. You can search for Sesame Home and click to view the grouting principle.