Two open valves are leaking.

There are two main reasons for leakage to the downstairs:

1, waterproof layer cracked.

Due to the change of temperature and humidity, the ground base cracks, which may cause the damage and leakage of the waterproof layer.

2. The ground buried water pipe leaks.

Because water supply may be stopped in the residential area, when water supply is resumed, the initial water pressure is high, which is easy to cause problems such as cracking of hot melt welding joints of water pipes, bursting and leakage of splayed valves. (Water pipes expand with heat and contract with cold, which will also cause water leakage at the joint. )

In view of the above situation, the handling opinions are as follows:

1, through the pressure test, check whether there is leakage in the water pipe. (When the presser hits 0.8 MPa (commonly known as 8 MPa or 8 kg), the pressure drop is less than 0.05 MPa within half an hour, which can eliminate the water pipe leakage problem. If the pressure drop is greater than 0.05 MPa, there is water pipe leakage).

2. Under the condition of eliminating water leakage of water pipes, it can be preliminarily judged that the waterproof layer is cracked.

According to the cause of the failure, the corresponding maintenance will be carried out.