There was a leak in my bathroom, and the property said that my pipe was leaking, so I dealt with it. The floor is waterproof, but the ceiling downstairs always leaks.

It's simple. Let's talk about three points first: First, before the renovation, did you check your house for quality problems? If yes, did you respond to the property before the renovation and ask for treatment? Has the property contacted the developer to deal with it in time? Second, you decorated the waterproof place. As far as property relations are concerned, you should bear the responsibility after renovation. However, the "Regulations on Building Safety Management" stipulates that the warranty period for ordinary decoration is two years and the waterproof project is five years. In other words, whoever decorates for you, you will find who is responsible, and the warranty period will expire after thorough treatment. Third, the possible situation, you changed the water pipe during the decoration process, and the joint was not connected well, resulting in water leakage. This situation should be that the wall leaks in a large area, not that the water leakage is particularly severe during the peak period. Finally, I have a little suggestion. You can go to your home with the decoration and property management unit to negotiate and open the wall for inspection. The problems caused by the decoration shall be the responsibility of the decoration party, and the problems caused by the developer shall be handled by the property contact developer or the construction party.