Integrated Buildings & Structures

  • 1.  Structural Insulated Panel Diapgragm

    Posted 03-20-2021 10:29 AM
    I'm looking for some resources on designing a roof diaphragm using SIPs.  Does anyone have experience or resources for this?  The design I'm working with has SIPs directly on top of rafters that are 4ft OC.  Since there's 7.25" of insulation between the rafters and the top layer of sheathing, I can't use the SDPWS manual.  Because the SIPs are attached with Lag-Screws it seems a little overkill to fasten the (short side) panel edges at 6" OC with lag bolts.  And I'm obviously limited by the rafter spacing as well.

    Thanks!

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    Eric Gilliland Aff.M.ASCE
    Gilliland Engineering
    Denver CO
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  • 2.  RE: Structural Insulated Panel Diapgragm

    Posted 03-21-2021 01:22 PM
    Most SIPS panels have integrated joists at 24" o.c.  So why would it be different than a traditional diaphragm design, yes I know the short side is not getting attachment.  Also you can count on the "ceiling" diaphragm with the OSB on the bottom.

    John Stensgaard, PE

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    John Stensgaard P.E., M.ASCE
    PRESIDENT
    S2E Consulting Engineers
    Thornton CO
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  • 3.  RE: Structural Insulated Panel Diapgragm

    Posted 03-21-2021 07:43 PM
    I recommend checking the SIP manufacturer's product literature. They typically have published diaphragm design values.

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    Michael Eisenbarth M.ASCE
    PRESIDENT
    RO YOUKER INC
    Lincoln NE
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  • 4.  RE: Structural Insulated Panel Diapgragm

    Posted 03-21-2021 07:43 PM
    Contact Structural Insulated Panel Association for some technical references. https://www.sips.org/about/what-are-sips

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    Mark Myers, P.E., M.ASCE
    Gig Harbor, WA
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  • 5.  RE: Structural Insulated Panel Diapgragm

    Posted 03-21-2021 09:33 PM
    The design guide below has some great examples ...


    https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.epsbuildings.com/gotodownloadfile.php%3Ffile%3D401&ved=2ahUKEwiW-py558XvAhVYFzQIHVZvDNQQFjAAegQIBRAC&usg=AOvVaw2LZ9IeJcjynAgVtLQhkAOG
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    Thomas Bekele A.M.ASCE
    Irvine CA
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