What is the reason for the water seepage in every corner of the new house?

Reasons for water seepage: First, the new waterproof has no effect; Second, although it has been waterproof again, the whole wall has been soaked by water before waterproofing, and it takes a long time for water to drain naturally. You'd better wait a few months before installing the wardrobe. Third, the water pipe leaks (this possibility is relatively small, the test is very easy, just turn off all the faucets and see if the water meter can move; In case the water pipe really leaks, just find the leak slowly. As for what kind of situation is caused, you can start by checking the water leakage of the water supply pipe. You can ask the water and electricity installer to check the water pressure of the pipeline with a pressure gauge, that is, disconnect the water supply pipe in the bathroom from the front valve, plug the nozzle with a plug, and take a water point to inject water into the pipeline and pressurize it to 0.6MPa (about 6kg). Inspection method: metal and composite pipe. The plastic water supply pipe should be stable at the test pressure 1h, and the pressure drop should not exceed 0.05MPa (about 0.5 kg); Then stabilize the pressure for 2 hours under the working pressure of 1. 15 (about 4.6kg), and the pressure drop shall not exceed 0.03MPa (about 0.3kg). If it exceeds the above range, it means that the water pipe leaks and needs to be reinstalled. If it weren't for the water pipes, you'd have to knock off the tiles and make them waterproof again.