Wednesday, June 3, 2015

Drain Pipe Knocking Sound

I am having an issue with my drain pipes. When I run hot water, either through my kitchen sink, bathroom sink, dishwasher, etc., there is a knocking sound that comes from the drain pipe. IT IS NOT THE SUPPLY LINE MAKING THE NOISE. Just want to be clear about that part. It will start off as a rapid knocking sound that will gradually slow down to a stop in about a 2 minute time frame. But after a while of constant hot water running, it will go away. However, the moment I switch to cold water, the knocking sound will come back in the drain line. It sounds like it is coming from behind the wall. I do not have ABS pipe for my drain. I believe they are steel.

Is there anyone else that has had this problem and knows how to fix it?

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