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I can only ask the upstairs to re-do the waterproofing, there is no other way.
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Negotiate with the upper floors first to allow it to be waterproofed (although it is difficult).
If you don't agree, look for a property.
You can't solve it yourself.
Do waterproofing needs to be done on the surface of the water, dig excellent permeability crystalline waterproofing, you can do it yourself on the cement surface with a super permeable waterproof guard (if there are cracks and potholes on the cement surface, fill the complete with metin porcelain glue and then do waterproofing). >>>More
Water seepage is a big problem, don't take it lightly, long-term water seepage will damage the wall, and it will go from the bathroom to the adjacent room, or even downstairs. >>>More
The valuation is that the wall and floor waterproofing of the bathroom is not done well, which is a more serious problem and is the responsibility of the landlord, you just need to tell the landlord. The landlord should be responsible for the repairs.
Now a little leakage, is the decoration of waterproofing when the materials are handed over is not dealt with, there are small gaps, in order not to have a contradiction with the downstairs householder in the future, it is best to do it again, find a professional to do, remember to dry it when redoing it,
It's not that the waterproof is not good, but the water is stored in the waterproof layer, and there is a role of water diversion to make the two bedrooms seepage at the same time, make the waterproof layer a little higher so that the water can be smoothly removed from the floor drain and toilet outlet, and it will solve your problem, and the waterproof around it will be a little higher.