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Re: wood truss diaphragm

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1)  I suppose the ceiling could be used to form a diaphragm, IF you put
plywood on the bottom chord of the trusses and detail the edge connection to
transfer diaphragm forces to the shear walls (interior and exterior).  Your
framers and your electricians will hate this.

2)  Usually on a pitched roof, we specify full height solid blocking between
trusses.  Roof sheathing is nailed to the blocking, and the blocking is
attached to the shear wall either with toenails, or metal connectors
depending on the force level.  If the cavity is too large for solid
blocking, pre-fabricated truss blocking can be used.


Conrad Guymon, P.E.

----- Original Message -----
From: <RainCat1(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Friday, June 01, 2001 11:45 AM
Subject: wood truss diaphragm

> Dear Fellow Engineers,
> These are just general questions for residential design:
>      1) If a truss has a ceiling, can it be design to transfer shear to
> interior shear walls?
>     2) If a truss has no ceiling, what kind of bracing is provided to
> transfer shear from the roof diaphragm to the shear wall (at the bottom
> level)?
> Thanks for your thoughts!
> Rainier C. Catubig, S.E.
> San Diego, California

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