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  1. #1
    Join Date
    Feb 2008
    Location
    Missouri
    Posts
    55

    Question Nashua 557 tape?

    Any thoughts on using Nashua 557 tape on new sheet metal ducts??
    Thanks!

  2. #2
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    It has UL181B approval, but I wouldn't use cloth backed duct tape for anything related to air ducts.

    Interesting study that was done on a variety of UL181B-FX rated tapes. It is primarily testing performance on flex duct, but they did a small test on metal too.
    The bits that are pertinent to your question is on page 11, and page 13.
    The cloth backed duct tape, which is what the Nashua 557 tape is, was the only one to fail completely...

    http://epb.lbl.gov/Publications/lbnl-50189.pdf
    If more government is the answer, then it's a really stupid question.

  3. #3
    Join Date
    Sep 2007
    Location
    KY
    Posts
    79
    Our entire company seldom uses duct tape anymore.

    Ironic that a HVAC company doesn't use much duct tape, but I believe it's a thing of the past.

  4. #4
    Join Date
    Dec 2007
    Location
    oregon
    Posts
    885
    Quote Originally Posted by Jake1980 View Post
    Any thoughts on using Nashua 557 tape on new sheet metal ducts??
    Thanks!
    Not up to code in my state any more. we now at my shop only use mastic on everything including flex. We caulk the furnace sets for neatness though.
    Genius = The guy who can do anything...except make a living!

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