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Old 10-19-2012, 09:22 AM   #1
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Rumbling Pipes When Water NOT In Use

The rumbling happens sporadically throughout the day, maybe 2-3 times a day and lasts 5-10 seconds. Sometimes it sounds like it's coming from the back bathroom, sometimes the front bathroom, but never from the kitchen OR water heater. The water heater was replaced in 6/2011 and has an expansion tank. Not sure exactly when it started, maybe 3-6 months ago? Plumber checked the water pressure and it was O.K., and didn't have any other culprit Any ideas about why it's happening??


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Old 10-19-2012, 09:49 AM   #2
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When someone uses hot water, the hot water pipe expands, lengthwise also. (When someone uses cold water, the cold water pipe contracts.) Later the pipe returns to room temperature. Some of the holes in the joists or studs through which the pipe passes may be a tight fit and the wood deforms slightly as the pipe elongates or shortens. Exactly when the pipe slides slightly in the hole to relieve the stress is random and sudden and the jolt can be transmitted to other, looser, pipes that can rattle.


The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.
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Old 10-19-2012, 10:24 AM   #3
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Rumblig Pipes

Thanks for the quick reply!

So, what should/can be done about it?
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Old 10-19-2012, 02:03 PM   #4
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could be a ball cock in one of the toilets running slowly causing a hammer...this could be from a leaking flapper.....try shutting off water to one toilet at a time see if it stops....ben sr
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