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  1. #1
    Join Date
    Mar 2007
    Location
    Corpus Christi, TX
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    613

    Default Flex ducts on joists

    I know they are supposed to be suspended, but being as how they are insulated, why can't flex ducts lay on the joists?

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    Default Re: Flex ducts on joists

    Quote Originally Posted by Thom Walker View Post
    I know they are supposed to be suspended, but being as how they are insulated, why can't flex ducts lay on the joists?
    They can, as long as the ceiling joist are 1-1/2" wide, and they are.

    The problem comes in from the ceiling being insulated, you do not want to lay the flexible ducts on the insulation, hence laying them on the ceiling joist usually does not work.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    25,304

    Default Re: Flex ducts on joists

    Condensation on the ducts.

    The ducts crush the insulation, reducing its R value.

    The ducts displace insulation, reducing it R value.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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