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  1. #1
    Join Date
    Oct 2014
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    Confused Duct install code question

    I have found the Calif codes online for installing insulated flexible ducts in the attic, but not sure I understand it.
    The installer only put a tie around the inner flex duct, and nothing else. No mastic or tape around the sleeve.
    It's in an unfinished attic.
    Is this within code?

  2. #2
    Join Date
    Aug 2013
    Location
    Visalia California 93291
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    Yes.....no tape, panduit straps we also apply duct sealant first

  3. #3
    Join Date
    Mar 2009
    Location
    Mount Holly, NC
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    Quote Originally Posted by Justme14 View Post
    I have found the Calif codes online for installing insulated flexible ducts in the attic, but not sure I understand it.
    The installer only put a tie around the inner flex duct, and nothing else. No mastic or tape around the sleeve.
    It's in an unfinished attic.
    Is this within code?
    This would not be to Code in my area.
    The TRUE highest cost system is the system not installed properly...

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  4. #4
    Join Date
    Jun 2002
    Location
    Dacula, GA
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    Mastic is required in GA at least 0.08 inches thick and should be 2" inside the liner. Panduit straps are a joke they expand when heated up and over and over again and become loose.

    Mastic will do the job. They are good to tie the insulation down but not for the inner liner other than an initial hold after the mastic is applied.
    "I could have ended the war in a month. I could have made North Vietnam look like a mud puddle."

    "I have little interest in streamlining government or in making it more efficient, for I mean to reduce its size. I do not undertake to promote welfare, for I propose to extend freedom. My aim is not to pass laws, but to repeal them. It is not to inaugurate new programs, but to cancel old ones that do violence to the Constitution."
    Sen. Barry Goldwater

  5. #5
    Join Date
    Mar 2009
    Location
    Mount Holly, NC
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    in my area, two different sealing types are required on the inner liner, and the outer liner must be mastic sealed to the plenum, and the boots. and ALL sealing devices must be UL listed, and labeled... mastic, tape, straps, etc...
    The TRUE highest cost system is the system not installed properly...

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    Do you go to a boat repairman with a sinking boat, and tell him to put in a bigger motor when he tells you to fix the holes?

    I am yourmrfixit

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