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Re: Shear tranfer from roof diaphragm to shearwalls with eaves?

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How does this work with 6" boundary nailing?
----- Original Message -----
From: "Jason Kilgore" <jkilgore(--nospam--at)leok.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Wednesday, November 12, 2003 3:06 PM
Subject: Re: Shear tranfer from roof diaphragm to shearwalls with eaves?


> Yes, blocking IS required, unless you have an alternate load path.
However,
> it doesn't have to be in every truss space - just enough to transfer the
> shear from the roof diaphragm to the shear wall (every other space or 2
out
> of 3 for example).  Also, it doesn't have to be solid blocking - if the
roof
> is steep enough, you can build a box out of 2x4's (nail the top to the
roof,
> bottom to your top plate, and the sides to the trusses) between the
trusses.
> Nail structural sheathing to the 2x4 box like a miniature shear wall.
>
> Actually, you probably can't block every truss space because of attic
> ventilation requirements.
>
> ----
> Jason Kilgore
> Leigh & O'Kane, L.L.C.
> jkilgore(--nospam--at)leok.com
> 816-444-3144
> 816-444-9655 (FAX)
> ----- Original Message -----
> From: "Dan Boltz" <dboltz(--nospam--at)mckinleyassoc.com>
> To: "SEAINT" <seaint(--nospam--at)seaint.org>
> Sent: Wednesday, November 12, 2003 4:28 PM
> Subject: Shear tranfer from roof diaphragm to shearwalls with eaves?
>
>
> > When pre-engineered wood roof trusses are shown with a 1'6" eave, is
> > blocking required above the shearwall to transfer the horizontal load
out
> of
> > the roof panels/diaphragm?  The eave currently shown has a non-standard
> > height above the shearwall location so the blocking would have to be cut
> to
> > the required size.
> >
> > The standard detail I'm referring to is on page 744 of "Design of Wood
> > Structures" by Breyer, 3rd Edition.
> >
> > Also, two of the buildings I'm designing are approximately 40' x 80'
> > rectangular single story buildings.  I'm being told that I shouldn't
worry
> > about the horizontal shear and that shearwalls aren't required or the
> > blocking I'm referring to above!  Am I missing something here?  I know
> there
> > is a lot of redundancy in the wall panels, but I was taught to ensure a
> > proper load path from the horizontal diaphragms to the vertical shear
> > elements into the foundation.
> >
> > Thanks.
> >
> >
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