How to solve the leakage from the top floor to the downstairs bathroom (I have no points. . I'm sorry

Waterproof warranty for 5 years and pipeline for 2 years. During the warranty period, the developer is not responsible. If not handled, you can complain to the local quality supervision department. They specialize in this matter, and then you can't go to court, or you will be responsible for the delay of the warranty period! In addition, if the same place is not repaired twice during the warranty period, you can find someone to repair it yourself, and the cost will be borne by the developer. You have to see clearly that it is not man-made, and the developer has the responsibility. You did a closed water test here before laying bricks, right? If there is no water leakage, you can have the house. If you decorate and brick again, people will not leak it for you, and it will leak after you decorate. So unless you can prove that you didn't destroy the original waterproof layer, the developers won't care about you, which is unreasonable for them. If I had to redo it at that time, I would have to find a decoration company instead. They should provide corresponding quality assurance, more information and better suggestions, and provide professional technical consultation on waterproof and leakage repair of concrete for free, so as to avoid the troubles of repairing today, leaking tomorrow, repairing every year and leaking every year.