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Re: to block or not to block?

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I would assume that the vertical web member at the end is aligned with the face of studs below. If this is so, then the panel edges are blocked on the sides and bottom by the top plate.  You would have to add blocking between the trusses to transfer the shear from the roof diaphragm to the panel.  I have seen this done up here.

-----Original Message-----
From: Joe Grill [mailto:jgrill(--nospam--at)]
Sent: Thursday, November 04, 2004 5:17 PM
To: seaint(--nospam--at)
Subject: to block or not to block?

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 discussion.

Joe grill


Joseph R. Grill, PE (Structural)