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Thread: Tape!

  1. #1
    Join Date
    Dec 2011
    Posts
    24

    Tape!

    I have a question regarding the use of certain tapes when it comes to duct seams/fitting connections. Looking at code books, they state UL-181A tape is to be used for all joint connections. Does this tape have to have mastic/butyl? Because there are UL-181A rated tapes that are just foil backed tape. I'm sure it will come down to "whatever your local inspector says," but if the tape is UL-181A, I personally think the mastic/butyl portion does not matter. Just looking for general opinions out there.

  2. #2
    Join Date
    Sep 2012
    Location
    Central Florida
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    887
    Tape falls off. Its just a mater of time, and does not matter how well it was tested.

  3. #3
    Join Date
    Oct 2012
    Location
    Toronto, Ontario
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    67
    foil tape works best it barely falls off

  4. #4
    Join Date
    Dec 2011
    Posts
    24
    Steveo86...I am thinking of using Polyken 339 foil tape...any brand name that you use?

  5. #5
    Join Date
    Oct 2012
    Location
    Toronto, Ontario
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    67
    cantech aluminum foil

  6. #6
    Join Date
    May 2009
    Location
    Cummins, GA
    Posts
    1,552
    I noticed over the years that everyone has a different way of taping things.

    I personally use this RCD fiberglass mesh. http://rcdmastics.com/glasscoat-fiberglass-mesh.html

    I then follow with foil tape,a good squeegee (sp?), and mastic. This tends to seal well and haven't had much problems since I started using the mesh.

  7. #7
    Join Date
    May 2012
    Location
    Upper Michigan
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    3,589
    It depends on the job for me, some get mastic tape and some get just foil. I think that polyken was the best but I never see it at our shop anymore.


    Sent from my iPhone using Tapatalk

  8. #8
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    Quote Originally Posted by ru1212 View Post
    I have a question regarding the use of certain tapes when it comes to duct seams/fitting connections. Looking at code books, they state UL-181A tape is to be used for all joint connections. Does this tape have to have mastic/butyl? Because there are UL-181A rated tapes that are just foil backed tape. I'm sure it will come down to "whatever your local inspector says," but if the tape is UL-181A, I personally think the mastic/butyl portion does not matter. Just looking for general opinions out there.
    That is correct. Foil tape with UL-181 printed on it is the minimum required. Your local codes could be more stringent though.

  9. #9
    Join Date
    May 2011
    Location
    tallahassee,fl
    Posts
    380
    181 w spray adhesive stays stuck.

  10. #10
    Join Date
    May 2004
    Location
    south louisiana
    Posts
    3,291
    hardcast brand 1402 mastic tape.
    as long as surfaces are clean and dry, this tape
    will seal.
    metal to metal..ductboard..sheetrock..wood..just about
    any surfaces except concrete.
    on hvac/duct jobs it is the only tape I use.
    The cure of the part should not be attempted without the cure of the whole. ~Plato

  11. #11
    Join Date
    Aug 2004
    Location
    S.E. Pa
    Posts
    6,277
    http://www.naima.org/publications/AH105.PDF

    UL 181-A is for ductboard
    181-B/ FX is for class 1 slinkies (flex duct)
    181-B-C is for zip ties
    181-M is for mastic

    FSK stands for "Foil Scrim Kraft" and is NOT approved for sealing ducts. It may be used on external duct insulation once the actual duct has been properly sealed with the appropriate UL 181 rated product. BTW, since this is brown paper, it is quite combustible.

    The code does not prescribe whether it has to be butyl backed or not but if you want to pass a duct blaster test, you will need the butyl backed tape. The tape you use must be imprinted so the inspector can be assured it is acceptable.

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