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RE: Plywood Diaphragm Values

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I have used the thinner values for plywood diaphragms before without any problems. If you need high capacity values try ICBO report # 1952. Don't forget to read the footnotes. these high capacity diaphragms need special detailing and special inspection. Good Luck.

-----Original Message-----
From:	Kipp Martin [SMTP:KAMartin(--nospam--at)]
Sent:	Tuesday, October 05, 1999 7:59 AM
To:	seaint(--nospam--at)
Subject:	Plywood Diaphragm Values

I am working on a project where we are using 3/4" plywood for the roof sheathing.  UBC Table 23-II-H gives diaphragm values for up to 19/32" (5/8") sheathing.  Are values for thicker plywood published by someone?  I've been told that I can use the values for the thinner plywood.  Is that true?  As you can tell, it's been a while since I worked with plywood.

--Kipp Martin, P. E.
Portland, Oregon