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  1. #1

    Question on blown foam duct work?

    I have seen pictures in the wall of shame of duct work with what looks like expandable foam spayed on it i assume as an insulator. I'm in Mass. and i never see this. Wondering if this is a method used in other states, a method not used anymore, or a hack method. Could anyone tell me if this was often used or is still used in some areas. Just looking for some kind of back ground on this. Thanks

  2. #2
    Join Date
    Oct 2011
    Location
    south al.
    Posts
    111
    i vote hack method. i guess the duct was sweating and this was someones answer. lol

  3. #3
    Join Date
    Jan 2010
    Location
    Dalton GA
    Posts
    227
    Growing up in northern Minnesota we recognized that styrofoam is an incredible insulator and fiberglass is just a filter that air easily moves through.

    So I wonder how you could compare air tite spray foam on air ducts in a hot or cold attic with say 1 to 2" of fiberglass.

    It might be worth running a test.
    Rodney Koop/ Dalton Ga
    founder of The New Flat Rate
    Owner of Masingill Clean Air

  4. #4
    Join Date
    Jan 2010
    Location
    Dalton GA
    Posts
    227
    Quote Originally Posted by Checksinmail View Post
    I have seen pictures in the wall of shame of duct work with what looks like expandable foam spayed on it i assume as an insulator. I'm in Mass. and i never see this. Wondering if this is a method used in other states, a method not used anymore, or a hack method. Could anyone tell me if this was often used or is still used in some areas. Just looking for some kind of back ground on this. Thanks
    I should ask where is the wall of shame you speak of.. I guess I should look at the picture before i comment.. lol
    Rodney Koop/ Dalton Ga
    founder of The New Flat Rate
    Owner of Masingill Clean Air

  5. #5
    The pictures are posted in this site under the Wall of shame pictures.

  6. #6
    Join Date
    Jan 2010
    Location
    Dalton GA
    Posts
    227
    Thanks I finally found them.. I posted a video there i'll post it here showing how we have done our air ducts for over 5 years with spray foam.

    http://www.masingillcleanair.com/High_Utilities.html

    We started doing it for air quality problems but of course it also stops sweating.

    scroll down to video.
    Rodney Koop/ Dalton Ga
    founder of The New Flat Rate
    Owner of Masingill Clean Air

  7. #7
    thanks rodney. never saw it before

  8. #8
    Have to say i never saw it before and seeing it under wall of shame a few times made me think it was a hack way insulating. I assume in your area this is a typicaly used product and i'm sure after 5 years, proven itself. I'd have to do some reading to see why it isnt used here but thanks for the info. Rodney

  9. #9
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,047
    I'd have to say, I'd be pretty upset if I had to replace a furnace, and they spray foamed my plenum.

    On the other side of things, I do HATE HATE HATE wrapping duct.....
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  10. #10
    Join Date
    Jan 2010
    Location
    Dalton GA
    Posts
    227
    Quote Originally Posted by hvacvegas View Post
    I'd have to say, I'd be pretty upset if I had to replace a furnace, and they spray foamed my plenum.

    On the other side of things, I do HATE HATE HATE wrapping duct.....
    to hvac vegas,,, you are right about wrapping ducts, here's something interesting. We've done this as i said for over 5 years, but we also give the option for wet mastic

    sealing and fiberglass wrap.. well in the last two years I think only 3 customers chose the fiberglass. mainly because it was about 1/2 the price.. but we offered to upgrade

    them at no cost and spray foamed it anyway, we haven't wrapped ducts in over two years and no one wanted to do it. we can spray foam a duct system in 1 to 2 hours and we're done.
    Rodney Koop/ Dalton Ga
    founder of The New Flat Rate
    Owner of Masingill Clean Air

  11. #11
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,047
    Quote Originally Posted by Rodney Koop View Post
    to hvac vegas,,, you are right about wrapping ducts, here's something interesting. We've done this as i said for over 5 years, but we also give the option for wet mastic

    sealing and fiberglass wrap.. well in the last two years I think only 3 customers chose the fiberglass. mainly because it was about 1/2 the price.. but we offered to upgrade

    them at no cost and spray foamed it anyway, we haven't wrapped ducts in over two years and no one wanted to do it. we can spray foam a duct system in 1 to 2 hours and we're done.
    Whats your mechanical inspector say?
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  12. #12
    Join Date
    Feb 2002
    Posts
    516
    Rodney, several questions. In the picture showing the trunk insulated with foam, why were the runouts insulated with foil FG? The can lights that were foamed, were they ICAT? What foam product and what equipment are you using? I would surmise that you are using closed cell foam. Do you do retrofit/replacement ducts in existing buildings also with the foam?

  13. #13
    Join Date
    Jun 2010
    Posts
    167
    Foam is a great insulator and sealer, but leave it to the insulation guys or the DIY. Its not for HVAC. How can you tell how many CFM are in something that looks like a 30 foot pumpkin or repair a 30 foot long item that's covered in foam? Make it right the first time. There are new adhesives, tapes, sprays, but not all apply to HVAC. If foam is going to be in HVAC we need to start buying crow bars, saws alls, hammers and chizzles because thats what it takes to do repairs on duct work and systems that are installed with foam.

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