I live on the fourth floor of the kitchen back dirty water, the toilet is often blocked, the third f

This depends on the situation, if it is a leak in the public pipe, the two families discuss to solve it, obviously the fourth floor will suffer. If the branch water pipe leading from the fifth floor is leaking, of course, the fifth floor is responsible for repairing it. In short, distant relatives are not as good as close neighbors, it is best to solve the problem, don't take the cost too seriously, calculate it too clearly, otherwise it will cause neighborhood disputes, and it will be very troublesome in the future.

Similarly, there is no fixed number to follow, and it can only be resolved through negotiation - find the property together and someone more experienced, and determine where it is more likely. Then negotiate and formulate a settlement and compensation plan, and then govern!

There's nothing wrong with that, can you manage the pattern of your own home, and can you manage other people's homes. Unrealistic.

It is likely that the waterproofing on the fourth floor will not leak if it is not done, and it will be easy to deal with it when you look at the specific location downstairs.

First of all, look at where the odor comes from, check the drain, and then look at the urinal, which is generally the odor coming from the urinal, you can install an imitation odor pad on the urinal.