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  1. #1
    Join Date
    Apr 2010
    Location
    pittsburgh
    Posts
    2

    trouble with an inspecter: need ul rated tape info

    My company is currently working on a largish job putting in 8 new rooftops with all new ductwork. Under normal circumstances we always seal the duct with most normally a mastic style product. On this particular job the office failed to inform us workers that it was absolutely necessary to do so; so our immediate boss said don't worry about it. Opps. Turns out our inspector is a stickler for the rules, and after having already taped all of our insulation seams, we now have to go back and cut open everything in order to seal the duct seams. So after you read all that, here's where the question begins. The inspector is insistent that we use ul-181 rated tape. It is what is referenced in the IMC book that he goes by and will not accept anything else. We only found this out after having already taped a few seams with ul-723 rated tape, which has the same rating of the mastic product that we use on all of our energy star and LEED projects. Does anyone have any information or knowledge about the differences between these two tapes, which is better or worse, etc. Any info would be appreciated.

    Thank you.

    Matt

  2. #2
    Join Date
    Mar 2003
    Posts
    7,326
    talk to your supplier and make them get you the papertrail. the one you are using is probably better than what he wants, but he doesnt recognize the numbers.

  3. #3
    Join Date
    Oct 2007
    Location
    Milwaukee,WI
    Posts
    1,093
    181 goes through a lot more testing. 723 is just the bare minimum standard.

    http://ulstandardsinfonet.ul.com/toc...=s&fn=0181.toc

    http://ulstandardsinfonet.ul.com/toc...=s&fn=0723.toc

    181 is usually a requirement of the NFPA 90A

    Closure Systems for Use With Rigid Air Ducts
    UL 181A

    1 Scope
    1.1 These requirements cover closure systems for use with factory-made rigid air ducts or air connectors complying with the Standard for Factory-Made Air Ducts and Air Connectors, UL 181. Closure systems consist of pressure sensitive tapes, heat-activated tapes, and mastics.

    1.2 Closure systems are intended for use with rigid air ducts installed in accordance with the Standard for the Installation of Air Conditioning and Ventilating Systems, NFPA 90A, and the Standard for the Installation of Warm Air Heating and Air Conditioning Systems, NFPA 90B; and/or Model codes.
    ___________________________

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  4. #4
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,714
    It may be surprising to note that there is no correlation between sealant longevity and rating with the UL test method.

    UL 181- Factory-Made Air Ducts and Air Connectors

    These requirements apply to materials for the fabrication of air duct and air connector systems for use in accordance with the International Mechanical Code (IMC), International Residential Code (IRC), and Uniform Mechanical Code (IMC), Standards of the National Fire Protection Association for the Installation of Air-Conditioning and Ventilating Systems, NFPA No. 90A, and the Installation of Warm Air Heating and Air-Conditioning Systems, NFPA No. 90B.

    UL 723 -Test for Surface Burning Characteristics of Building Materials

    This method of test is for surface burning characteristics of building materials is applicable to any type of building material that, by its own structural quality or the manner in which it is applied, is capable of supporting itself in position or being supported in the test furnace to a thickness comparable to its intended use.
    Instead of learning the tricks of the trade, learn the trade.

  5. #5
    Join Date
    Oct 2007
    Location
    Milwaukee,WI
    Posts
    1,093
    All that matters is that it's NFPA 90 and IMC approved.

    UL 181 is somewhat specific to the HVAC industry standard.... especially in a commercial building.


    http://www.ul.com/global/eng/pages/o...uilding/ducts/
    Last edited by Lash; 04-14-2010 at 07:42 PM.
    ___________________________

    Chicago is an indian word for stinky!!!!!!
    -supertek65

  6. #6
    Join Date
    Apr 2010
    Location
    pittsburgh
    Posts
    2

    So it goes:

    Thanks to each of you for your response. I am glad that I have found this forum with members who are willing to help out and give info. I did some more follow up research along the lines that you all pointed me to and did find some more information on this subject that could have helped our situation on the job with this inspector, had I been allowed to present it to him. Never did get the chance though; the boss thought it best not to get on this guy's bad side and just told us to do what he says how he says and get the job passed. Turns out we have a couple of jobs in the works right now in the same area and will have to go through the same people for those inspections. Once again, thanks.

    Matt

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