My family lives on the top floor, and I found the roof leaking. The property is waterproof, and I want to do a closed water test. Is there a standard?

Just plug the drain on your roof and fill the whole roof with water so that the water won't overflow. After 48 hours, observe your roof for signs of water leakage. If not, the waterproof is basically qualified.

Pay special attention to two problems: whether the waterproof layer is a protective layer or not, if it is not waterproof, it will not last long; Is the drainage direction of the base surface of the protective layer towards the drain? This will not cause water accumulation on the roof and increase the risk of water leakage.