Hammer noises in wall from 2nd flr sink???
Posted by Neil Monk on January 10, 1999 at 19:18:43:
When a second floor sink drains and its cool or cold outside
and the drain water is warm or hot. The wall where the pvc drain
pipe runs sounds like some on is hitting it with a hammer while the
water is draining. No other devices cause this noise. I have opened up
the wall and all I see is a 3" pvc pipe? can someone tell
me what causes this hammer noise and how to correct it?
Neil Monk

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