Solid blockings are required not only to transfer roof diaphragm shear to
but also to serve as brace to the truss at the bearing point. Therefore, the
should be used at least at every other truss space.
2" diameter vent holes can be made at each blocking for venting purposes.
You can have up to 4 holes for each blocking.
Jie Lu, P.E., S.E.
J. Lu International, LLC
St. Louis, MIssouri
----- Original Message -----
From: "Jim Kestner" <jkestner(--nospam--at)somervilleinc.com>
To: "SEAINT" <seaint(--nospam--at)seaint.org>
Sent: Wednesday, June 14, 2000 3:46 PM
Subject: Wood Diaphragm Edge
> We typically provide solid blocking in every 3rd space between roof
> trusses to bring the roof diaphragm load down to the shear wall. The
> Architect says he has to have venting in every truss space and does not
> understand why we need this blocking. We suggested that he have a
> continuously vented soffit and add venting between the trusses where the
> blocking is not required.
> I thought about using Simpson H1 clip to help take the load down to the
> wall, but then you still don't have sufficient edge nailing on the
> Any suggestions?
> Jim Kestner, P.E.
> Green Bay, Wi.