03:42PM | 05/31/05
Member Since: 05/30/05
1 lifetime posts
I hope that someone can help. I recently built a new house and the upstairs toilets are very noisy when they are flushed. It sounds on the first floor as if you are sitting next to the toilets. I know for a fact that the drainage pipes were wrapped in insulation and the cavity of the wall that they are running in, was filled with insulation (including trying to blow in additional insulation after construction to try to fix the problem). The wall that they are running through is a partition wall that is only 6 inches wide. As a result, the pipes (which I believe are 4" wide) are very close to the inside surface of the dry wall. Does anyone have any thoughts about how to fix this problem.


04:57AM | 06/09/05
Member Since: 08/29/04
227 lifetime posts
The only real way to stop the noise coming down that interior wall, is to insulate (which you have done) or to replace the pipe with cast iron. Cast iron is fairly silent when its inside a wall. The other option is to make the wall slightly wider and use fiberglass pipe insulation around the outside of the pipe. It will just about eliminate the sound of the water running in the piping.

Insulation is about the only option however.

Good Luck

Raymond VinZant Plumbing Prof.
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