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  1. #1
    Join Date
    Mar 2007
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    Spring City/Surrounding Philadelphia area
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    Default I-Joists as Roof Rafters

    This is the 1st time I've seen this so I'm not sure what to make of it. The house I looked at yesterday had some areas of the roof rafters framed with I-joists. You'll see in the attached pics that the ends of the I-joists have had filler boards installed over the webs at the tail ends.

    It doesn't look right but I'm not sure what to think.

    Thoughts?

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
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    26,248

    Default Re: I-Joists as Roof Rafters

    Nick,

    Try here: http://www.askcodeman.com/tech_docs/...ts/TJ_9001.pdf

    Sections 6 and 7 - those photos do not look right.

    Also other sections.

    Last edited by Jerry Peck; 08-14-2009 at 05:31 PM. Reason: updated link
    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Join Date
    Mar 2007
    Location
    Spring City/Surrounding Philadelphia area
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    3,473

    Default Re: I-Joists as Roof Rafters

    Thanks Jerry. Very good reference material. The install definitely appears wrong on a few counts:

    1 - the ends of the I-joist are notched and none of those instructions show any notching and the notching that was don on the ones I saw will place the entire load on the upper half or the I-joist

    2 - the filler boards in my pics are secured with what appear to be staples and the refernce material you included calls for 10d nails at minimum


  4. #4
    Join Date
    Sep 2008
    Location
    Texas
    Posts
    745

    Default Re: I-Joists as Roof Rafters

    There may be an engineers report for this particular installation on this house. You might check with the AHJ and see if they have a copy of a report.

    I know anytime we have a "different" situation like that, we require a report from the engineer that manufactured the trusses.


  5. #5
    Michael Garrity's Avatar
    Michael Garrity Guest

    Default Re: I-Joists as Roof Rafters

    http://www.ilevel.com/literature/TJ-9001.pdf

    What is supporting the joists shown in the picture?Did you look under the insulation for additional support?


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