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Safety factors for attaching screws to OSB

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I use FS of 6 times the load duration factor which comes out close to 4.  This is based on the APA technical note for "Fastener Loads for Plywood - Screws  Number E830C, December 1995".  Tested values for OSB should have a similar factor of safety.


From: Drew Morris <dmorris(--nospam--at)>
To: SEAINT <seaint(--nospam--at)>
Subject: Safety factors for attaching screws to OSB

I have it in my mind that the recommended safety factor for screws in
withdrawal from OSB is a minimum of 4.  Does anyone know what APA
publication lists this?  I have been searching the publications that I
have and cannot find it.  I have a call into APA.

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