How to detect where the roof leaks?

There are several detection methods for roof leakage: 1. Direct observation: In rainy days or when there is water, the location of water leakage can be preliminarily determined by observing whether there are signs of water leakage on the roof. 2. Smoke test: ignite the smoke bomb or chimney on the roof, observe the flow direction of smoke, and find the location of water leakage. 3. Infrared detection: By scanning the roof with an infrared thermal imager, the temperature change at the leaking place can be detected. 4. Hydrostatic test: put a certain amount of water on the roof, observe the direction and speed of water flow, and find the location of water leakage. 5. Probe test: You can find the location of water leakage by testing one by one on the roof with probes. It should be noted that the above methods are only preliminary methods to determine the location of water leakage, and the specific maintenance needs professional roof maintenance personnel to carry out inspection and maintenance.