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  1. #14
    Join Date
    Jan 2008
    Posts
    2,090
    Don't overlook the adjustable elbows. Whatever method you chose, (tape, mastic), elbows can leak, especially when stressed, so look at those areas also. And get the dust/dirt off of the area first. Personally, I think both mastic and foil tape look like crap. Aluminum shade silicone caulk can work in some areas, and kinda blends in if you're concerned about those things.
    When using mastic, you can apply duct tape to give a mask edge, then remove the duct tape. Leaves a clean edge.

  2. #15
    Join Date
    Sep 2005
    Location
    Texas
    Posts
    2,793
    don't think I've ever read anything that said silicone was an approved sealant for duct

  3. #16
    Join Date
    Jul 2005
    Posts
    5,576
    Quote Originally Posted by Swampfox View Post
    AF-100 is not mastic tape

    Mastic tape works great on metal, wont stick to ductboard very long at all
    That's correct. The SF-685 is mastic tape, the AF-100 isn't. Both are approved for their advertised purposes. Check with the local AHJ just in case.

  4. #17
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Quote Originally Posted by howard33 View Post
    What about Aeroseal:
    http://www.aeroseal.com/

    Does this work?
    Seems like it would really, really, really depend on the tech doing it.
    Anyone with experience where this was used?
    thanks,
    howard

    Interesting that you asked,I was just going to post it.

    Excellent process tried and proven.We have been doing it for over 5 years.

    It is time consuming to seal ductboard ,so a little pricey,but definately works and you have true before and after seal leakage cfms.

    Plus it seals from the inside out,so we can seal ducts in spaces that no one can even get to.With hand seaing leaks are often or always under the insulation,at the metal or flex liner,hard toget to,Aeroseal seals there with no problem.

  5. #18
    Join Date
    Jun 2000
    Location
    WYO
    Posts
    2,019
    Duct mastic.
    never say never

  6. #19
    Join Date
    Mar 2005
    Location
    Near Philly
    Posts
    98
    Quote Originally Posted by dash View Post
    Interesting that you asked,I was just going to post it.

    Excellent process tried and proven.We have been doing it for over 5 years.

    It is time consuming to seal ductboard ,so a little pricey,but definately works and you have true before and after seal leakage cfms.

    Plus it seals from the inside out,so we can seal ducts in spaces that no one can even get to.With hand seaing leaks are often or always under the insulation,at the metal or flex liner,hard toget to,Aeroseal seals there with no problem.
    how pricey is pricey?

  7. #20
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Prices aen't allowed ,see the rules.

    What we see is hand sealing guys chare as much as 75% less ,but no testing so you don't know what they accomplished for the $ spent.Duct leakage not sealed will cost you as long as you live there!!

  8. #21
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,111
    I agree!
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  9. #22
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Glad to hear you endorse Aeroseal,have you look into using he process?

  10. #23
    Join Date
    Feb 2008
    Location
    Tennessee
    Posts
    91
    ok, so I have to ask about this hand sealing process....

    Sealing the main square trunk is pretty straight forward but the round piping coming off the main trunk has insulation on the outside. Is it nessessary to remove the insulation and check/seal all the seams then re-install the insulation?

    From what I remember this insulation is held with a special staple too.

  11. #24
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Quote Originally Posted by printmanjackson View Post
    ok, so I have to ask about this hand sealing process....

    Sealing the main square trunk is pretty straight forward but the round piping coming off the main trunk has insulation on the outside. Is it nessessary to remove the insulation and check/seal all the seams then re-install the insulation?

    From what I remember this insulation is held with a special staple too.
    You are correct.

  12. #25
    Join Date
    May 2007
    Location
    Naples, Fl
    Posts
    889
    Before you go to all the trouble to seal the ducts you should make sure they're the right size or the results you get may not be what you had in mind.

  13. #26
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Quote Originally Posted by adrianf View Post
    Before you go to all the trouble to seal the ducts you should make sure they're the right size or the results you get may not be what you had in mind.
    Very good point,sealing leaks will increase the static of the duct system at least a little,sometimes a lot,depends on size and location of the leaks.

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