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donk
11-24-2008, 02:51 PM
Hi - we recently had our townhouse totally re-plumbed with CPVC supply pipes (to replace the defective polybutylene it was built with). About 7 months later some of the pipes have started to make a banging noise after the water is shut off on certain faucets. The noise is not too loud (more like a tap, tap, tap) and only lasts about 30 seconds after the water is shut off.

My question: Is this likely to cause an eventual catastrophic pipe breakage? Or even a non-catastrophic one?
The plumber warrantied the project for a year. But I dunno if he's gonna cover replacing the drywall that will have to be cut into to secure the pipes (if that's what the problem is).
Thanks,
Donk

Terry
11-24-2008, 02:59 PM
Up to 30 seconds afterwards?
Sound like expansion and contraction of the pipe rubbing against wood or clips as it warms and then cools.
Sort of a Tick, Tick, Tick, ?

I wouldn't worry about it.