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larryslade 02-12-2012 07:34 AM

Noise down cellar
I have a sound, a bang, that occurs a few time a night down cellar. I've had the oil furnace company check things out, no problem. I've had someone near the furnace when the heat kicks in, no noise. I've had someone near the water heater when it kicks in, no noise. As far as I can tell I don't have an animal problem. No smell or other signs. It always happens at night and only happens a couple of times. I don't believe in ghosts so I'm ruling that out. Anybody have any ideas? Thanks a lot.

JoeD 02-12-2012 09:15 AM

Sump pump. It has a check valve that could clunk when the pump shuts off.

larryslade 02-12-2012 09:25 AM

noise down cellar
don't have a sump pump. thanks

nealtw 02-12-2012 09:55 AM

Duct work cooling off and contracting??

inspectorD 02-12-2012 02:52 PM

My guess? Slow leaking toilet, the bang is when the water stops filling the toilet above it on the first floor.
Or other water supply issue, start running some water.
Heat pipe in a wall or floor when it expands.listen while the heat is on.

BridgeMan 02-15-2012 09:21 PM

Had a neighbor's house doing something very similar many years ago--loud bang, only a few times a night. Both of us spent some time snooping around, and couldn't figure it out (of course, it never did it while we were down there looking for the possible source). One night it happened when we were playing pool in his newly finished basement rec room. The sound I heard then instantly reminded me of how some steel girder bridges I've inspected occasionally give off very similar sounds when just certain girder lines either expand or contract. Sometimes it's even a loud bang, if the girder is long and deep enough, has fit-up problems, or is restrained by diaphragm connections in just a certain way.

The load-bearing wall down the middle of Bob's basement consisted of a single long run of steel I-beam, welded to support plates at the tops of steel pipe columns. At the time, I suggested to Bob that his noise could be coming from that steel beam line, magnified by the floor joists it carried, as it shortened in a certain manner after the furnace was turned down for the night (a long supply-line plenum ran right next to almost the full length of beam). He agreed with that theory, after remembering he rarely heard the noise during the warmer months of the year, when the furnace wasn't used.

sandbuoy 02-20-2012 07:06 AM

I would guess the toilet leaking or duct pipes cooling down like suggested. Both can make the banging sound andf at night when everything is quiet its more noticeable.

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