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  1. #1
    Join Date
    Nov 2012
    Location
    Worcester, MA
    Posts
    16

    Duct leakage questions

    Do you guys duct seal and/or tape the seams of the snap lock on ductwork?

  2. #2
    Join Date
    Nov 2012
    Location
    Worcester, MA
    Posts
    16
    Anyone?

  3. #3
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Don't do installs anymore but back in the day yes and no. Should you? Yes. It's a very cut throat market in residential. 9 times out of 10 the low bid gets the work and I promise you his bid will not include duct sealing.

  4. #4
    Join Date
    Apr 2010
    Location
    NC Sandhills
    Posts
    393
    Mastic all seams, better than most duct tape. There is also matic tape but it is cheaper to buy a bucket and brush but a bit messy it you dont give it time to dry before wrapping/hanging.

  5. #5
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,139
    I use a combo of paint on mastic & mastic tape.
    depends on what is being sealed & if it has to be wrapped
    or how close duct take offs are on plenums.
    having both on hand makes it simple.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  6. #6
    Join Date
    Jun 2011
    Location
    Houston area
    Posts
    1,493
    I read the article. There are things about his description of radiant barriers that defy physics. And maybe, due to his choice of words, it's semantics.

    If a fluid or solid of any sort exists in any state it will seek equilibrium, either positive or negative, Doesn't matter if the energy mechanism is conductance, radiance, convection or any other thing in the Milky Way. The mathematics are pretty straightforward and do not lie. The conservation of energy and mass are irrefutable.
    The picture in my avatar is of the Houston Ship Channel and was taken from my backyard. I like to sit outside and slap mosquitos while watching countless supertankers, barges and cargo ships of every shape and size carry all sorts of deadly toxins to and fro. It's really beautiful at times.....just don't eat the three eyed fish....

    ¯`·.¸¸ .·´¯`· .¸>÷÷(((°>

    `·.¸¸..· ´¯`·.¸ ¸.·´¯` ·.¸>÷÷(((°>

    .·´¯`· .¸>÷÷(((°>

    LMAOSHMSFOAIDMT

  7. #7
    Join Date
    Oct 2011
    Location
    Indiana
    Posts
    33
    Around here we are still getting used to increased RNC energy codes that include duct sealing. You're only allowed so much duct leakage and it includes what is lost at the boot going into the conditioned space.
    The three most prevalent methods I've heard around hear are Mastic, the Hardcast tape w/ blue writing and black rubber backing, and siliconing every joint. Everyone has their own preference, but it seems the tape is the most popular in my county.

  8. #8
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by Cooked View Post
    I read the article. There are things about his description of radiant barriers that defy physics. And maybe, due to his choice of words, it's semantics.
    What are your specific issues with what he said?

    I ask, because everything he said about radiant barriers, and about how the bubble wrap stuff would have to be installed to achieve the manufacturers claimed R value, is 100% correct.
    If more government is the answer, then it's a really stupid question.

  9. #9
    Join Date
    Nov 2012
    Location
    Worcester, MA
    Posts
    16
    Ok thanks for the responses. I personally prefer to duct seal it with paint on mastik because its the cheapest, but sometimes i use the foil tape, i would never use mastik tape its like $40 a roll. My boss insists we do it though i was just curious because i had the theory that its not a leak spot unless you undersize your ductwork. The way i see it is that the air wants to take the path of least resistance which is down the duct to the supply or return, why would it want to fight its way through a tiny crack if the duct isnt undersized.

  10. #10
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    Quote Originally Posted by Datsik View Post
    Do you guys duct seal and/or tape the seams of the snap lock on ductwork?
    what for...... and never
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  11. #11
    Join Date
    Dec 2003
    Posts
    2,369
    some of us just care that much....

  12. #12
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    where do you think the leakage goes...... outside.... don't think so...... done hundreds of houses zero problems ....and zero foil tape....lol
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  13. #13
    Join Date
    Dec 2003
    Posts
    2,369
    Umm yes.... it leaks outside..... Thats why we seal the ducts....mastic is better than foil tape...lol

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