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RE: Plywood Shear Wall Nailing

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I would not worry about it too much as far as structural capacity of the wall.  I would worry about the water born bacteria/ mold issues.  I had a project 10 years ago or so, where we had a floor diaphragm exposed to a lot of rain, the OSB swelled up.  We ran it by the engineers at APA, were told that in general the OSB will shrink back down.  We checked it in selected locations 6 months later and indeed this is what happened.  Check with APA help desk, they'll have references.




Alexander (Sasha) Itsekson, SE, LEED AP

Enginious Structures, Inc.

Oakland, CA



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From: Larry Hauer [mailto:lhauer(--nospam--at)]
Sent: Saturday, January 16, 2010 8:49 AM
To: Struct. Eng. Assoc.
Subject: Plywood Shear Wall Nailing


To All,

I have a wood framed commercial building project that has been stopped in mid-construction due to the economy. The plywood shear walls, (actually OSB Exposure I, Exterior Type), have been exposed to several rains and some of the nail heads appear to be sunk into the plywood about 1/16"- I think because of swelling of the OSB. I remember that somewhere there is an allowance for overdriving nails into plywood and I would assume that requirement could apply here- but I can't remember where that requirement is.

Can anyone help?

Thanks in Advance,

Larry Hauer S.E.

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