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noisy pipes....

Posted by JohnE on July 29th, 1997 03:34 PM
In reply to Noisy Pipes - How do I fix them for GOOD! by Joe McIntyre on June 23rd, 1997 01:22 PM [Go to top of thread]

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Moderator Post:
> Noisey Pipes by dmasher on 11/08/2004

I doubt you have "water hammer" WH subsides within a few moments of a sudden valve closure.
Based on your description of "... bang & knock for a few annoying hours.." that it is caused by thermal expansion (contraction) as the water in the pip es cool.
You don't hear it initially, as the sound of the shower masks it.
Insulating the pipes will slow the heat loss & slow the thermal contraction.
Oddly, this can also be caused by excess pipe hangers.

Good luck & hope this helps.
Cheer s;

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