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RE: Plywood over 2x Decking for Diaphragm[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Plywood over 2x Decking for Diaphragm
- From: "Eli Grassley" <elig(--nospam--at)psm-engineers.com>
- Date: Mon, 23 Jan 2006 14:37:14 -0800
Sounds good to me as long as you get the right nail penetration listed in the design tables. I would be concerned with the boundary nailing though. At the diaphragm boundary I think you need the nail to penetrate thru the decking into the wall top plates, or whatever your chord/struts are. You’re looking at 20d’s probably.
~~ Eli Grassley, PE
I have a project where the client has (so far) provided a floor system consisting of 3/4" plywood over 2x6 T&G decking. The decking spans 3 ft to 6x10 purlins. It seems to me that I can use the plywood diaphragm values for a blocked diaphragm assuming nail size (short enough to not protrude clear through the decking) and penetration is taken into account in the diaphragm values. I think this is the case as all the panel edges are backed up with the decking so the diaphragm can be considered “blocked” and the 2x6 decking will span the 3 ft.
Joseph R. Grill, P.E. (Structural)
Shephard - Wesnitzer, Inc.
Civil Engineering and Surveying
P.O. Box 3924
Sedona, AZ 86340
PHONE (928) 282-1061
FAX (928) 282-2058
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