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RE: Strenth and Stiffness of 1x diagonal floor sheathing??

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AF&PA’s Special Design Provisions for Wind & Seismic (free download at has shear and stiffness values for 1x6 & 1x8 diagonal lumber sheathing.




Gary J. Ehrlich, PE

Program Manager, Structural Codes & Standards

National Association of Home Builders (NAHB)

1201 15th Street, NW, Washington, DC 20005

ph: 202-266-8545  or 800-368-5242 x8545

fax: 202-266-8369


From: Bill Allen [mailto:T.W.Allen(--nospam--at)]
Sent: Tuesday, October 02, 2007 11:13 PM
To: seaint(--nospam--at)
Subject: Strenth and Stiffness of 1x diagonal floor sheathing??


I’m working on an existing building built in Orange County around 1920 (or so). I need to determine the strength and stiffness of the floor diaphragm.


I know that the four term APA equation probably doesn’t apply, but if not that, then what should I use instead?




T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509