What s going on with the paint on the corner of the bathroom on the first floor

Clean off the painted walls and reapply the paint.

Peeling of the wall paint on the wall may be due to the surface being too smooth. If the original paint is varnish or powdery (plus untreated colorant paint), the new wall paint will not stick firmly on the surface, which may be rotten wood or rusty spots on the metal, or peeling off due to poor quality of wall paint. >>>More

This is because your tile grout is used incorrectly, presumably the white cement used at the time to hook the joint, and the white cement is directly filled in the joint with dry white cement, so the water in the ground is sucked up. >>>More

You can make a water pipe from the first floor to the second floor.

Find the cause of the collapse first, the old building is mostly caused by the long-term leakage of the underground pipeline, find the property to look at the sewer pipe drawings, clean up the collapse, remove the serious ground, find the cause of the collapse and eliminate it, refill it, do waterproofing, and do the ground.

If the moisture return place is the corresponding place on the ground or wall of your home, it means that your home is leaking and you can give you some simple solutions, but it may not be practical. >>>More