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Old 01-08-2009, 06:24 AM   #1
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Fed up with explosions in basement


I randomly hear an abrupt bang coming from the basement seemingly random. If I'm in the office or sleeping, it can feel it in the house.

1. It is not linked to water faucet usage (an arrestor is installed too)

2. It is not linked to a start cycle of the furnace, nor is it coming from the actual furnace unless the shockwave radiates throughout the ducting

I opened up the furnace and it didn't look excessively dirty.

I hear it maybe twice a day, and I have tried to sit in the basement but it never happens when I'm down there. This will save me some psychological issues in the future and deter the ghost hunter people because a neighbor says my house is haunted

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Old 01-08-2009, 07:13 AM   #2
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Fed up with explosions in basement


What's the age of the house? Could it be the wood "checking"?

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Old 01-08-2009, 07:34 AM   #3
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Fed up with explosions in basement


House built in 54'

I did a quick google search, that sounds pretty dang serious because the frequency of occurance is pretty high. I heard a mention of hot/cold cycles, some of the HVAC ducting uses the floor beams, but i'm not sure if that is just the return air ducting.
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Old 01-08-2009, 01:44 PM   #4
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Fed up with explosions in basement


- This weekend put a 3x5 card and a pen in your pocket. Write down every time you hear it happens.

- Hire your kid (or someone else's) to sit in the basement for a day and wait. Hell, I even know some adults who would do it for 50$. You might even get them to do it for free if you toss in the ghost angle.

Happy hunting.
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Old 01-08-2009, 03:09 PM   #5
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Fed up with explosions in basement


I'd sit down there for a free keg of beer. I used to charge a case of beer but I had to go up on my price.could it be related to expansion and contraction caused by the heat of the sun on the house. my house is 7 years old and creaks and pops when the sun comes up and again when it goes down.then again, it's probably just ghosts. if that's the case, I will do it for 2 cases of beer. premium beer, that is.
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Old 01-08-2009, 03:18 PM   #6
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Fed up with explosions in basement


Happens often in our house. In our case it is a winter-only occurance, and it's due to temperature changes. A loud knock or bang, heard all through the house. Typically happens about 1-3 times / day when very cold, like -10 or lower. Our home is c1989, in the GTA. No worries.
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Old 01-08-2009, 06:00 PM   #7
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Fed up with explosions in basement


Could be a sump or ejector pump. The last 2 houses I've lived in, both of those pumps bang pretty good when they shut off.

And I assume it's a "bang" you hear, not necessarily an explosion.
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Old 01-09-2009, 05:55 AM   #8
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Fed up with explosions in basement


Depends on what you call loud, but if you can "feel" it I would be worried. We had ductwork that would pop when heat came on, and it was loud, but you could not feel it througout the house. And was unmistakenly a metallic pop. Water hammer is rarely that bad, even in the worst of cases. What kind of heater, water heater??? I would definitely consider a thorough inspection of them.
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Old 01-09-2009, 06:07 AM   #9
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Fed up with explosions in basement


May not be mechanical, could also be structural....
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Old 01-09-2009, 07:56 AM   #10
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Fed up with explosions in basement


Water heater bang'n from excess sediment?
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Old 01-09-2009, 06:10 PM   #11
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Fed up with explosions in basement


Thanks everybody for our replies. I know for sure it is not the water heater, that is another noise and easy to identify when it starts cooking pop corn. Well this morning I was in my office and I felt the bang in the corner of the house. The only thing over there are the heater ducts and I also know of a NG line that runs to a fireplace in the basement. I suppose its the heater ducts...or just ghost monsters punching the heater ducts.
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Old 01-09-2009, 06:39 PM   #12
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Fed up with explosions in basement


You'll notice that galvanized heat ducts have a cross or X bent into them. This is for strength and to keep the ducts from flexing excessively. My guess is one of the ducts is slightly tweaked (probably on the top of the duct) and when they expand a few minutes after the heat comes on they pop. Probably striking a floor joist. When it cools it returns to its normal position until it heats up again. May not do it every time the heat comes on.
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Old 01-09-2009, 08:14 PM   #13
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Fed up with explosions in basement


Sounds like the heat ducts. I grew up in a house built in the early 70s. Whenever the heat would come on, the ducts would pop and tick. When the heat would turn off, they'd do it again. I was used to it but I do remember laying in bed listening to it.

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