AWC Issues Southern Pine Design Value Addendum to NDS

Originally published by: American Wood CouncilApril 2, 2012

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The American Wood Council (AWC)  is the authority on engineering related to the use of lumber. They adopt and use the SPIB-defined, and ALSC-approved lumber design values. Their website defines how all industries should react to lumber engineering, which includes everything from the engineering required to develop and justify conventional light-frame construction performance tables (i.e., the prescriptive requirements of the IRC, Wood Frame Construction Manual, etc.) to engineered uses of lumber when used in glued-laminated beams, I-joists, trusses, etc.

To that end, the AWC website provides the following information:

Addendum to the NDS (click on the pdf link below to view the full document)

About Southern Pine Design Values

The American Lumber Standard Committee (ALSC) Board of Review has approved changes to design values for 2"- 4" thick, 2"- 4" wide, Southern Pine #2 Dense and 2x4 Mixed Southern Pine #2 and all lower grades (i.e. #3, Stud, Construction, Standard, and Utility) with a recommended effective date of June 1, 2012, to allow for their orderly implementation. For more information, visit and

In advance of the implementation date, AWC has developed an addendum to the NDS Design Values for Wood Construction that provides design values for these sizes and grades of Southern Pine and Mixed Southern Pine to use with the 2012 NDS2005 NDS, and the 2001 NDS. AWC has also developed an addendum to the Design Values for Joists and Rafters that provides design values for these sizes and grades of Southern Pine and Mixed Southern Pine to use with the Span Tables for Joists and Rafters.

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