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Thread: number of jack studs / trimmers / cripples for headers

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    number of jack studs / trimmers / cripples for headers

    Depending on the terminology you use, where in the IRC does it address the number of supports under a header?
    If a header spans 3 foot or 12 foot or any other length, is there a section in the IRC that addresses the number of cripples required under that header?
    Figure 602.3(2) shows a drawing that defines different components and gives sections relating to certain ones, but nothing addresses the trimmers.

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    Sawhorse mtlogcabin's Avatar
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    TABLE R502.5(1)
    GIRDER SPANSa AND HEADER SPANSa FOR EXTERIOR BEARING WALLS
    (Maximum spans for Douglas fir-larch, hem-fir, southern pine and spruce-pine-firb and required number of jack studs)
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    High Desert (May 5th, 2011), Pcinspector1 (May 5th, 2011)

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    Sawhorse High Desert's Avatar
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    I knew that someone named mtlogcabin would know about wood!
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    We call them cripples or trimmers in these parts!

    mtlogcabin is on his game! R502.5(1)

    pc1
    Last edited by Pcinspector1; May 5th, 2011 at 16:29.

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    should be in chapter 6, too.. but you'll find the requirements in chapter 5

    so............... why isn't it in the wall section too.. (that's where I would look for it if I hadn't already been beaten into submission)
    (PE)ach
    some days are just that..

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    Yep...MT nailed it.....I usually tell the contractors that if they want to go rule of thumb.....6' double jacks....but depends on what you hold up....

    I feel the same way peach....
    Please support Jim Brown, Deputy Building Official from Gillette, Wyoming for ICC Board of Directors.
    My questions and answers are based on some bastardized hodge podge starting with the 2003 I-codes amended by the state of CT in 2005 and 2009 including the 2005 NEC ....and as of today.....The 2011 Connecticut Amendments to the 2009 International Energy Conservation Code portion of the 2005 State Building Code has been posted to the State Building Inspectorís website

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    Sawhorse mtlogcabin's Avatar
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    2009 IRC
    Chapter 6 refers you to chapter 5. Maybe it is in 5 because as you start up with a house the floors would be the first place a header maybe required
    Wood Framing
    R602.3 Design and construction.
    Exterior walls of wood-frame construction shall be designed and constructed in accordance with the provisions of this chapter and Figures R602.3(1) and R602.3.(2) or in accordance with AF&PA's NDS. Components of exterior walls shall be fastened in accordance with Tables R602.3(1) through R602.3(4). Structural wall sheathing shall be fastened directly to structural framing members. Exterior wall coverings shall be capable of resisting the wind pressures listed in Table R301.2(2) adjusted for height and exposure using Table R301.2(3). Wood structural panel sheathing used for exterior walls shall conform to the requirements of Table R602.3(3).
    Studs shall be continuous from support at the sole plate to a support at the top plate to resist loads perpendicular to the wall. The support shall be a foundation or floor, ceiling or roof diaphragm or shall be designed in accordance with accepted engineering practice.

    Exception: Jack studs, trimmer studs and cripple studs at openings in walls that comply with Tables R502.5(1) and R502.5(2).

    Metal framing
    R603.7 Jack and king studs.
    The number of jack and king studs installed on each side of a header shall comply with Table R603.7(1). King, jack and cripple studs shall be of the same dimension and thickness as the adjacent wall studs. Headers shall be connected to king studs in accordance with Table R603.7(2) and the following provisions:
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    Quote Originally Posted by Pcinspector1 View Post
    We call them cripples or trimmers in these parts!

    mtlogcabin is on his game! R502.5(1)

    pc1
    Cripples are the short studs above or below an opening.

    Here's a video showing cripple headers:

    http://www.youtube.com/watch?v=7Ynu0...feature=relmfu

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    your sick...........

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    Quote Originally Posted by Rick18071 View Post
    your sick...........
    Yes.

    You have no idea how long it took me to find that video after the image came to me.

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    Any time I need a good laugh I come here. When I am done laughing I have the realization that life isn't all that bad. Seeing those kids having fun I think that I may never have anything to complain about that really matters.

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