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RE: 3x Sill Plates and IBC-09

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Section, Item 4c. of 2008 SDPWS requires 3 in. nominal lumber for high load shear walls (700 plf nominal = 350 plf for ASD).


Section, Item 4 of 2008 SDPWS has the same requirement for “high-load diaphragms”.



Here is an article describing some changes to SDPWS for the 2008 version.



Jeffrey D. Linville

Director, Technical Services

American Institute of Timber Construction




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From: Larry Reynolds [mailto:llreyno(--nospam--at)]
Sent: Thursday, September 10, 2009 1:33 PM
To: seaint(--nospam--at)
Subject: 3x Sill Plates and IBC-09


Section 2305.3.11 of IBC-06 requires 3-inch nominal sill plates for shearwalls that resist a load of 350 plf (ASD) or 490 plf (LRFD).  This section has been removed in the IBC-09 and Section 2305 now requires use of AF&PA Special Design Provisions for Wind and Seismic 2008 (SDPWS).  The SDPWS does not require the 3x sill plate for high demand shearwalls.

Is there a technical reason for this change or is this a case of unintended consequences?


Larry Reynolds