Noise in Exhaust Chimney

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Old 11-06-02, 11:46 AM
mnbadam4
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Question Noise in Exhaust Chimney

We just moved into a new home and have just recently started to use the furnace as it is now cold outside. In this home, the furnace is in the middle of the basement and, as a result, the exhaust chimney goes up through the middle of the house. Whenever the furnace turns on, there is an annoying tapping noise in the wall where the exhaust chimney runs through. I understand that metal expands and contracts due to the change in temperatures, but is there anything that can be done to eliminate the tapping noise without having to tear out walls?
 
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Old 11-06-02, 04:15 PM
fjrachel
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You've got to get to the flue to stop the noise....
 
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Old 11-06-02, 05:55 PM
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mnbadam4:

Is this a newly constructed home or is it one that may have had a chimney liner put into an existing chimney.
 
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Old 11-21-02, 12:59 PM
mnbadam4
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The home is less than three years old.
 
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Old 11-21-02, 01:15 PM
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mnbadam4:
If you are unable to secure the chimney where it is accesible, you will as fjrachel said, somehow have to get to the chimney where it travels to the roof to find out where it is making noise.
If you put something like a piece of broom handle between the wall and your ear you may be able to pin-point the source of the noise.
 
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Old 11-21-02, 01:31 PM
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Question Noisey chimney..

When hearing the sound to see if its fron the chimney or the furnace, try shutting down the furnace with the service switch after it starts making the noise, in an attempt to isolate the location of the sourse.
You may also want to have an efficiency test to make sure you don't have the furnace overfired, this would send excessive heat up the flue. Modern furnaces should have a much lower flue temp. The 90 plus condensing gas furnaces on the market for the last several years even use plastic pipe for the exhaust.
 
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Old 11-21-02, 01:42 PM
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Noises

Another thing to try is to open the cleanout door to try hear the sound from there. Get the wifes make-up mirror and a good flashlight and try look up the chimney to daylight. Some of the old masons would mortar a pane of glass in the liner to block the air flow to the chimney until they got paid. Upon getting paid, they dropped a brick down the liner to shatter the glass blockage.
Oh!, do you have a fire place? with a damper control? If so the metal parts MAY be expanding in a tight place making the noise.
 
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Old 12-19-02, 09:58 AM
mnbadam4
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Response to Flue Temp

In your response to the suggestion regarding the flue temp. What should the flue temp be and is there a way I can measure it myself before I call out a servcie tech?

Thanks for yuor help!!
 
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Old 12-19-02, 10:21 AM
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Smile It depends on your furnace.

mnbadam4:

The flue temp would be included with information that would come from the furnace manufacturer.
 
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Old 12-20-02, 04:58 PM
bugsmeso
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Why not one more country heard from. Is this a single story or two story, can you get to the attic where the B-vent come through to the roof? If so.get to the attic and look down the chase...........it should be large enough to look down with a flashlight. Code requires so much clearance between b-vent and wood.....possibly some was dropped in the chase.(during construction) or forgotten to be secured.
 
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