07:53AM | 01/16/04
Member Since: 01/07/04
5 lifetime posts
Hello. As I've written in the past on here (and appreciate all the helpful responses!). I have a very thin wall in the house that is probably 6 inches thick, 12 feet high. The wall houses the drain pipes (PVC material) from bath upstairs. When shower is used, the pipe makes frequent, short loud bangs, and when sink is used, it does too--though it lasts longer even past when sink is off. Believe it is thermal expansion, insulated wall in lieu of knocking big holes to put sleeve on pipe. No luck, still does it. Now the wall is full of white dusty insulation----holes haven't been plugged, still have small access window to shower drain pipe (main culprit), anything I can do? The drain pipe is about as thick as the wall is, so the insulation itself provides very little cushion between pipe and wall. Thanks


05:57PM | 01/25/04
I wonder if this is water hammering your hearing. Does it happen when a sing is turned on or off or during their usage? I know if the holes drilled for the DWV pipe aren't large enough, they can make noise. Also, if large enough air chambers are not installed on the supply lines to each faucet, they can pound and hammer from sudden pressure changes.

erik peterson

03:18AM | 01/27/04
Member Since: 06/23/03
223 lifetime posts
Sounds as though your shower valve needs to be serviced, rebuilt or replaced. Ive never heard/seen p.v.c. "bang", expansion/contraction of lines (whether water or waste) is a slight clicking/ticking noise. erik
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