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Step Down Truss Centers

LeeGrindinger | Posted in General Discussion on January 24, 2004 06:29am

Well, this is probably an idiot’s question but, hey, I’ve never used step down trusses before.

I’ve got step down trusses on a 6/12 hip. The steps are clearly 12″ which means the trusses are on 24″ centers. Piece of cake…

So, this puts the centers for the sheathing and drywall on about a 26 3/4″ center which means a lot of cutting. Am I missing something here? Also, how should I handle a plywood joint on the edge of the truss?

Thanks,

Lee

www.furniturecarver.com
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  1. gdavis62 | Jan 24, 2004 06:48pm | #1

    We usually order trusses with stepdown areas having top chords dropped so we can field-install sleepers of 2x4 that continuously bridge the stepdowns at 24" centers.  For small-enough hips, we have the truss company provide one-lift sleeper trusses that lay down on the stepdown and plane out to roof.  If yours weren't dropped, you can do some bevel cutting and stick them between.

  2. User avater
    BossHog | Jan 25, 2004 04:13am | #2

    I understand why you would have roughly 26 3/4" measured along the rake where there are flat top chords, and that would affect the roof. But why would that affect the drywall?

    I don't see how you could handle a plywood joint on the edge of a flat top chord. I suspect you're thinking about turning your plywood 90° and running the long edge up the slope? I think that's a bad idea.

    As Mr. Micro said, the best way to do it is to fit some short "rafters" inbetween the flat top chords on 2' centers, then continue your plywood up the slope as you normally would.

    As Mr. Micro also mentioned, dropping the flat top chords the thickness of a 2X4 laid flat is one way to do it. Actually a MUCH BETTER way, IMHO. But yours must already be vuilt and on site?

    We build the lay-down frames he mentioned - We call 'em "hip gables". Don't know why. But when they fit, they're great. Just drop 'em in place after you set your trussses and you're ready for plywood.

    One way to avoid this is to ask for longer setback dimensions. Some companies only build hip jacks up to about 8' long. Others build them up to 16' or so. The longer setbacks reduce or eliminate the need for blocking or "hip gables".

    .

    Just realized I had a pic of a "hip gable". I'll attach it just in case you aren't clear on what Mr. Micro and I were talking about.

    1. LeeGrindinger | Jan 25, 2004 05:11pm | #3

      Thanks Mr.Micro and Boss,

      I'll block it out.

      Leehttp://www.furniturecarver.com

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