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RE: to block or not to block?
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: to block or not to block?
- From: "Meyer, Albert" <AMeyer(--nospam--at)CagleyHarman.com>
- Date: Thu, 4 Nov 2004 17:33:44 -0500
I would want blocking between trusses to transfer shear from
the diaphragm to the sheathing and have the panel edge blocked (shearwall
boundary). Just my opinion.
Albert J. Meyer, Jr.
Cagley Harman & Associates,
& Parking Consultants
900 West Valley Forge Road
King of Prussia, PA 19406-4525
I was going home last night by a
route that I normally don’t take. A house under construction is just
about closed in and I noticed that instead of blocking between the ends of the
roof trusses the contractor had just sheathed over the ends of the
trusses. At first I wasn’t too surprised as construction around here can
turn up all kinds of strange things, but then I thought…why not? These
are manufactured residential roof trusses, with plated panel points, almost
parallel top and bottom chords and heel depths of about 24” from what I could
see as I drove by. I noticed hurricane clips where the sheathing hadn’t
been applied yet. But, if the sheathing is nailed per what would be
required to transfer the shear from the roof diaphragm to the wall plate, such
as a shear wall would be nailed, wouldn’t that be adequate to restrain the
trusses from rolling over? It appears that the shear transfer would be
there. Kind of like a really short shear wall. Just a question for
R. Grill, PE (Structural)