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  1. #1
    Join Date
    Feb 2007
    Location
    Bellingham, WA
    Posts
    115

    Insulating my duct work

    What would be the best material to insulate my ductwork? Should I use the fiberglass insulation that is designed for ducts or Reflectix wrap?

    Thanks

  2. #2
    Join Date
    Dec 2005
    Location
    mid-atlantic
    Posts
    105
    first, is there a local code requirement for insulating duct? then, where will the duct be installed? now you are ready to pick an insulation material.

  3. #3
    Join Date
    Mar 2008
    Location
    Central NH
    Posts
    141
    After considering your code, you need to identify (with manual J) what R value you need, then you can get the insulation. Don't worry about the type, it is more important that it functions right and doesn't take away from your system.

  4. #4
    I've been told unless the duct work is under your house (craw space) there's no need to insulate them. Any cooling or heating that comes off of them is in the house thus you have no heat/cooling lose

  5. #5
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    Quote Originally Posted by hedtedjr View Post
    After considering your code, you need to identify (with manual J) what R value you need, then you can get the insulation. Don't worry about the type, it is more important that it functions right and doesn't take away from your system.
    manual J tells you what "r" value you need? please explain this to me... i am curious
    If Guns Kill People, Do Pencils Misspell Words?

    http://www.youtube.com/watch?v=An2a1...eature=related

    Before we work on artificial intelligence why don't we do something about natural stupidity?

  6. #6
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    Quote Originally Posted by gashog View Post
    I've been told unless the duct work is under your house (craw space) there's no need to insulate them. Any cooling or heating that comes off of them is in the house thus you have no heat/cooling lose
    if your duct is ini any un-conditioned space it needs to be insulated!! crawl space, attic, seal chase's within the structure. and even sometimes in conditioned spaces it is desirable to insulate the duct work.
    If Guns Kill People, Do Pencils Misspell Words?

    http://www.youtube.com/watch?v=An2a1...eature=related

    Before we work on artificial intelligence why don't we do something about natural stupidity?

  7. #7
    Join Date
    Apr 2004
    Posts
    7,680
    Quote Originally Posted by gashog View Post
    I've been told unless the duct work is under your house (craw space) there's no need to insulate them. Any cooling or heating that comes off of them is in the house thus you have no heat/cooling lose

    Dont believe everyting you're told. Regarless of the source. As I have said before, I "have been told" how to correct my golf swing and now I'm no better if not worse than before. A visit with a true golf professional is the only way to make it right. Even though I have been playing for going on 35 years.

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