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RE: IBC Wood Frame Shear Wall Table -- panels over gypsum

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I suppose it would only matter if it affects fire rating. I think originally the gyp had to be applied directly to the studs meaning that the plywood could only be applied over it. If that hasn't changed it might indeed be a problem.

Mark E. Deardorff, SE
R & S Tavares Associates, Inc
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From: Tom Skaggs [mailto:tom.skaggs(--nospam--at)]
Sent: Thursday, August 02, 2007 9:34 AM
To: seaint(--nospam--at)
Subject: IBC Wood Frame Shear Wall Table -- panels over gypsum

I?m curious if anybody uses the Panels (wood structural panels) Applied OVER ½? or 5/8? Gypsum Sheathing portion of the IBC wood frame shear wall table (Table 2306.4.1).  It appears that this portion of the table may be a relic of the Uniform Building Code.  If this portion of the table were dropped, I?m curious how much heartburn this might cause.


Thanks in advance,




Thomas D. Skaggs, Ph.D., P.E.
Manager, Product Evaluation

Technical Services Division
APA - The Engineered Wood Association
7011 S. 19th Street
Tacoma, WA 98466
ph: 253/565-6600
fx: 253/620-7235