The pvc sewer pipe in the bathroom will make a loud noise when it meets hot water, and the hands will feel vibration. Any experienced expert has an idea, and his head is about to explode!

To be exact, it should be crackling, and it is very noisy. It's a PVC sewer pipe interface. If you don't believe me, you can shake the sewer pipe with both hands, and the interface will make the same sound. When it is cold, the hot water connection upstairs rings frequently and the drain pipe is not arranged properly. Please check if there is anything wrong with the exhaust on the roof, such as the mouth is too small and blocked. Similar problems will occur if pipes are replaced on the floor of a building. The fundamental solution is to make sound insulation when winding the drain pipe. Such as plastic wrap. If it is packed with cement pressure plate, it can also greatly alleviate this problem by stuffing something in the space and then filling it with styrofoam. this is mine