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Thread: Coating on TJI

  1. #1
    Join Date
    Mar 2007
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    Cape Cod, Massachusetts
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    574

    Default Coating on TJI

    All the joists were coated with a high gloss type finish, almost an epoxy look to it. Does anyone know what this might be?

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    Ken Amelin
    Cape Cod's Best Inspection Services
    www.midcapehomeinspection.com

  2. #2
    Join Date
    Mar 2012
    Location
    Lansdale, PA
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    Default Re: Coating on TJI

    Probably an intumescent coating. Some codes require covering engineered joists, using a fire sprinkler system, or a coating to reduce the risk of collapse in the event a fire occurs.


  3. #3
    Join Date
    Oct 2012
    Location
    Massacusetts
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    149

    Default Re: Coating on TJI

    Actually it looks like there is a coating on the side - covered by the insulation , any chance you pulled some insulation and took a picture


  4. #4
    Join Date
    Apr 2013
    Location
    Illinois
    Posts
    7

    Default Re: Coating on TJI

    Quote Originally Posted by Ken Amelin View Post
    All the joists were coated with a high gloss type finish, almost an epoxy look to it. Does anyone know what this might be?
    Looks like an intumescent paint as suggested by Mark. From a fire-protection perspective it makes little sense to coat the sides of the members and not the bottom, plus that engineered limber (or solid lumber) will last longer in a fire than steel bar joists, which tend to twist and sag when they get hot.

    Could also be a spray-applied vapor barrier separating the conditioned upstairs from the basement or crawl space (?).

    David


  5. #5
    Join Date
    Mar 2007
    Location
    Cape Cod, Massachusetts
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    574

    Default Re: Coating on TJI

    The coating was on all the joists. The insulation had a vapor barrier, so I don't think it was that.

    Ken Amelin
    Cape Cod's Best Inspection Services
    www.midcapehomeinspection.com

  6. #6

    Default Re: Coating on TJI

    Quote Originally Posted by Ken Amelin View Post
    The coating was on all the joists. The insulation had a vapor barrier, so I don't think it was that.
    What you probably saw was a TJI FLAK JACKET by WEYERHAEUSER joist mfr for fire rated protection. The i joist span increase is improved to meet structure burn safety qualifications in single and multi family construction. rbj1


  7. #7
    Join Date
    Mar 2012
    Location
    Lansdale, PA
    Posts
    876

    Default Re: Coating on TJI

    That may be it. I was not aware that this was offered from the factory. See image below.

    TJI Flak Jacket.jpg


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