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    sleeplessatnight's Avatar
    sleeplessatnight Posts: 2, Reputation: 1
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    #1

    Jan 17, 2007, 11:39 AM
    Knocking/banging noise from air ducts
    We just moved in to this 1992 built house, which has a 10 year old furnace. I constantly hear a knocking ( TAK TAK ) mixed with semi loud banging noise from the vents through out our house. It comes from different air ducts. However when I turn off the furnace altogether, the noise stops after a few minutes.
    Its quite irritating in the nights. Please help !
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #2

    Jan 17, 2007, 05:00 PM
    Quite often heat runs are not suspended correctly and they expand and contract. Can you see any of the ductwork, most of the time when I hear of this problem, it is an upflow furnace, located in a basement, and the registers are in the floor. Is this your situation?
    sleeplessatnight's Avatar
    sleeplessatnight Posts: 2, Reputation: 1
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    #3

    Jan 18, 2007, 08:25 AM
    Yes, you are right. The registers are on the floor & it is an upflow furnace located in the basement. How could I suspend the heat runs correctly & where should I look for the problematic ones? Is there a difference between registers on the floor vs when they are wall mounted ( like we had in our old house ( 1928) built)? Thanks for your prompt reply.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #4

    Jan 18, 2007, 03:35 PM
    Look for metal hanger that the pipes rest on. Then simply put a piece of foam insulation between the pipe and the hanger. Sorry I don't have enough time to fully reply to the second part of your question.
    Lan99dis's Avatar
    Lan99dis Posts: 1, Reputation: 1
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    #5

    Dec 27, 2009, 08:09 AM
    Our furnace is in the attic and the ductwork obviously goes downward through the walls. This "tac-tac" noise is in several places going to the first floor of our house. If I remove the drywall should I enlarge the space between the duct and the wood studs or put some type of insulation between the duct and the wood studs?

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