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Re: Roof Diaphragm / Ridge Vent

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Try a diaphragm across on the collar tie if you have one.  Design openings
as you would for a diaphragm that are large enough for aeration.  I believe
that if the opening area is less than 6% of the whole diaphragm area then
the impact on the rigidity and shear capacity is  mnimal. Critical sections
are at the change-of-direction connections.  Out of plane buckling may be an
issue if equivalent thickness of the shear plane is "thin".


-----Original Message-----
From: W. Gray Hodge <hda(--nospam--at)>
To: seaoc(--nospam--at) <seaoc(--nospam--at)>
Date: Friday, February 06, 1998 11:51 PM
Subject: Roof Diaphragm / Ridge Vent

>Does nayone have any suggestions on an efficient means for making the
>roof diaphragm continuous for a double pitched roof with a continuous
>ridge vent? (Plywood sheathing on pre-fabricated wood trusses)>