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Plywood over 2x Decking for Diaphragm

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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.


Any thoughts?



Joe Grill


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