Seeing as how the nails control in sheathing, and I would guess that you wouldn’t have applied a second layer without first pushing the nail spacing to its minimum… I can’t imagine that two layers of sheathing of the same side of the wall would accomplish anything other than tearing the studs up.
From: ENGRLAINES@aol.com [mailto:ENGRLAINES@aol.com]
Sent: Monday, July 06, 2009 3:46 PM
To:
Subject: Double Layer Plywood Shear Wall
Contractor "forgot" the interior layer of plywood in a shear wall spec'd for sheathing on both sides. Wants to put double layer on the outside since the interior has been finished. I cannot find any restrictions in the Codes, so I assume this can be done assuming the same requirements for sheathing on two-sides and no reduction in strength. Anything special to watch out for?
TIA
Charles O. Laines, S.E.
LAINES ASSOCIATES,