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  1. #1
    Join Date
    Mar 2019
    Location
    Washington
    Posts
    20
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    Mastic versus Tape for sealing ductwork etc

    Curious about opinions on using mastic versus tape on new ductwork and equipment installs. Contractors I have used have done both but I prefer the tape just because it looks like a cleaner installation. My last new HVAC system was a horizontal crawl space air handler on which the contractor used mastic for sealing all the joints. Mastic doesn’t look as clean as tape but ir may be a better installation when it comes to tight joints.


    Is there any reason to use one over the other?

  2. #2
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    5,263
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    I use mastic over the tape. I am sure this isn’t the norm but I have use masking tape then peeling it off to give a nice clean line, doesn’t take much time.

  3. #3
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    7,246
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    Tape for looks, mastic for effect.

  4. #4
    Join Date
    Oct 2011
    Location
    Gladstone, Oregon (Portland)
    Posts
    2,019
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    When I went to duct sealing class it was all about mastic, mastic, and then more mastic. Normally applied with a pookie brush. I have also been known to have fun applying it with a pair of gloves for those hard to reach areas .

  5. #5
    Join Date
    Jan 2019
    Location
    Vero Beach, Florida
    Posts
    510
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    Mastic with membrane tape.

  6. #6
    Join Date
    Dec 2003
    Location
    Citrus County, Florida
    Posts
    2,989
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    Quote Originally Posted by fliks View Post
    I use mastic over the tape. I am sure this isn’t the norm but I have use masking tape then peeling it off to give a nice clean line, doesn’t take much time.
    Me too. It makes for a nice appearance.
    Doug

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