After my home is renovated, if I take a shower with a floor drain, it will make the bathroom downstairs leak. I found a property, and the property said that I had to tear down the ceiling downstairs t

After my home is renovated, if I take a shower with a floor drain, it will make the bathroom downstairs leak. I found a property, and the property said that I had to tear down the ceiling downstairs to judge. The ceiling downstairs is to be demolished, even if you poke a hole first. If the pipeline leaks, the ceiling will definitely not stay; If your waterproof leaks, you have to smash all the bathrooms in your house to make it waterproof again, and you have to look downstairs when testing the water. So you'd better take your work downstairs.