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RE: Perforated Plywood Shear Walls

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As noted, most of the shear wall and diaphragm provisions in Chapter 23 of the 2009 IBC have been replaced with a reference to the 2008 edition of AWC’s Special Design Provisions for Wind and Seismic, which is available for a “read-only” free download at as well as for purchase in PDF and hardcopy versions. This was done to avoid duplication of – and conflict with – the provisions in the SPDWS. The 2008 SDPWS covers force-transfer and perforated shear walls in addition to traditional shear walls, so those are still permitted via the reference in Chapter 23.


Updated versions of the ’05 NDS and ’01 WFCM are in their latter stages of development and will be out before the end of the year, in accordance with the special exemption granted to allow certain updated standards to be referenced in the 2012 I-Codes even though their processes were not complete by last year’s final ICC hearings.


(I suspect AWC staff is still recovering from their annual meetings last week; otherwise I’m sure Buddy or someone would have replied by now J.)





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From: Larry Hauer [mailto:lhauer(--nospam--at)]
Sent: Wednesday, August 03, 2011 11:39 AM
To: Struct. Eng. Assoc.
Subject: RE: Perforated Plywood Shear Walls


Thanks for the info. I knew it was in the '05 NDS, (which I have), but I understand that there is now an '08 NDS, (which I don't have), and the '10 CBC might refrence this newer edition and the perforated/force transfer around openings concept might not be in there. I will try and check this out, and if I determine anything, will post it.
Thanks again,

From: tkennedy(--nospam--at)
To: seaint(--nospam--at)
Subject: RE: Perforated Plywood Shear Walls
Date: Tue, 2 Aug 2011 14:25:34 -0700

Hi Larry,


The H/W ratio greater than 2:1 and table 2305.3.4 can be found in the NDS page 22 (Table 4.3.4) of Special Design Provisions for Wind and Seismic Design  of the NDS (One of the small books that came with the 2005 NDS set) as for the perforated shear walls, they are also in the NDS, I don’t know where offhand.




Thomas Kennedy, P.E.


Erstad Engineering, Inc.

3463 Oceanview Blvd

Glendale CA 91208

PH:  818-249-8400

Fax: 818-249-8405

From: Larry Hauer [mailto:lhauer(--nospam--at)]
Sent: Tuesday, August 02, 2011 1:47 PM
To: Struct. Eng. Assoc.
Subject: Perforated Plywood Shear Walls


To All,
I was under the belief that the '10 CBC, ('09 IBC), was basically the same as the '07 CBC, ('06 IBC), but I noticed in the WOOD chapter, (Chapter 23), that most of Section 2305 has dissapeared, including the requirements for perforated and force transfer around openings plywood shear walls design guides, (i.e. Section 2305.3.5 to 2305.3.11). Also, there use to be a table- Table 2305.3.4 that allowed for plywood shear walls with an H/W greater that 2:1.
Have these design guide lines gone somewhere else or are these types of plywood shear walls no longer allowed??
Thanks in Advance,
Larry Hauer, S.E.