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National Design Specification® (NDS®) for Wood Construction

2012 Wood Design Package

The 2012 Wood Design Package includes the publications listed below. To purchase, choose one of the following options:

Buy a PDF Buy Now What Changed
Non-member $150.00
Member/Student* $75.00

The 2012 NDS, 2012 NDS Supplement: Design Values for Wood Construction, 2008 Special Design Provisions for Wind and Seismic (SDPWS), and ASD/LRFD Manual set is available for purchase.

Revisions to the 2012 ASD/LRFD Structural Wood Design Solved Example Problems manual continue and its availability will be announced once it is updated.

Please note that additional changes to design values for southern pine dimension lumber are anticipated in 2013. A new addendum to the 2012 NDS Supplement will also be provided once those values are available. More information.

NDS for Wood Construction, 2012 Edition

2012 NDS Cover

ANSI/AWC NDS-2012 National Design Specification (NDS) for Wood Construction with Commentary

ANSI/AWC NDS-2012, was approved as an ANSI American National Standard on August 15, 2011. The 2012 NDS was developed by the American Wood Council's (AWC) Wood Design Standards Committee and is referenced in the 2012 International Building Code.

 

NDS Supplement: Design Values for Wood Construction

2012 NDS Sup Cover

NDS Supplement – Design Values for Wood Construction, 2012 Edition

Design provisions in the NDS are integral with design values in the NDS Supplement. As such, it is not appropriate to mix design values and provisions from different editions of the NDS. For example, the 2001 NDS Supplement contains increased shear design values for sawn lumber to reflect changes in ASTM D245 and provisions of the 2001 NDS were revised to address these increases.

 

Special Design Provisions for Wind and Seismic (SDPWS) Standard with Commentary

SDPWS with Commentary 2008

The AWC SDPWS-08 covers materials, design and construction of wood members, fasteners, and assemblies to resist wind and seismic forces. Engineered design of wood structures to resist wind or seismic forces is either by allowable stress design (ASD); or load and resistance factor design (LRFD).


Free View-only Download

 

ASD/LRFD Manual for Engineered Wood Construction, 2012 Edition

Engineered Wood Construction 2012

The ASD/LRFD Manual contains design information for structural lumber, glued laminated timber, structural-use panels, shear walls and diaphragms, poles and piles, I-joists, structural composite lumber and over 40 details are included in the chapter on connections.

Free Download

 

Click here for a special notice about changes to southern pine design values.

 

* Qualified students are those who are full-time students enrolled in a wood design course at a university or college.

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Updates

Several errata and addendums have been developed for the NDS and ASD Manual. These are available in PDF format here.

Design Aids

Several supplemental tables have been developed for the NDS to facilitate design of connections. Design Aids are available here.

Technical Reports

A technical report has been published to facilitate design of connections. This report covers calculation of lateral values for single dowel type fastener connections using a generalized and expanded form of the NDS yield limit equations. General Dowel Equations for Calculating Lateral Connection Values: Technical Report 12. This document is also in PDF.

Technical Questions

To submit a technical question to AWC, e-mail info@awc.org or see contact information.

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2005 Wood Design Package

2005 Wood Design Package The 2005 Wood Design Package includes the publications listed below. To purchase, choose one of the following options:
Buy PDF Now Buy Now What Changed
Non-member $150.00
Member/Student* $75.00

NDS for Wood Construction, 2005 Edition

ASD/LRFD NDS

ANSI/AF&PA NDS-2005 National Design Specification (NDS) for Wood Construction

with Commentary

and NDS Supplement – Design Values for Wood Construction, 2005 Edition



2005 NDS Supplement

The 2005 Edition of the National Design Specification for Wood Construction was approved as an American National Standard on January 6, 2005. The 2005 NDS was developed as a dual format specification incorporating design provisions for both allowable stress design (ASD) and load and resistance factor design (LRFD). The NDS is adopted in all model building codes in the U.S. and is used to design wood structures worldwide.

Design provisions in the NDS are integral with design values in the NDS Supplement. As such, it is not appropriate to mix design values and provisions from different editions of the NDS. For example, the 2001 NDS Supplement contains increased shear design values for sawn lumber to reflect changes in ASTM D245 and provisions of the 2001 NDS were revised to address these increases.

Articles appear in the Winter 2004 edition of Wood Design Focus about the contents and application of the 2005 NDS. For an overview of what the new NDS contains, click here. Wood Design Focus is a journal of the Forest Products Society and is one of the benefits of AWC Design Professional Membership. Also, an eCourse STD104 on the 2005 NDS is available to help users get acquainted with the standard.

The 2005 NDS is available only as part of the complete 2005 Wood Design Package. Thus, neither the NDS and Supplement, the Commentaries, SDPWS, nor the ASD/LRFD Manual will be sold separately to purchasers. However, all parts of the Wood Design Package except the 2005 NDS and Solved Example Problems are available to download from this webpage.

Special Design Provisions for Wind and Seismic (SDPWS) Standard with Commentary

SDPWS with Commentary 2005

The ANSI/AF&PA SDPWS-2005 covers materials, design and construction of wood members, fasteners, and assemblies to resist wind and seismic forces. Engineered design of wood structures to resist wind or seismic forces is either by allowable stress design (ASD); or load and resistance factor design (LRFD).


Free View-only Download

ASD/LRFD Manual for Engineered Wood Construction, 2005 Edition

Engineered Wood Construction 2005

The ASD/LRFD Manual contains design information for structural lumber, glued laminated timber, structural-use panels, shear walls and diaphragms, poles and piles, I-joists, structural composite lumber, metal plate connected wood trusses, and pre-engineered metal connectors. Over 40 details are included in the chapter on connections. A comprehensive chapter on fire design includes fire rated wall and floor assemblies for solid sawn lumber, I-joists, and trusses. For an overview, click here.

Free Download

Click here for a special notice about changes to southern pine design values.

Structural Wood Design Solved Example Problems, 2005 Edition

Solved Problems 2005

Structural Wood Design Solved Example Problems is intended to aid instruction on structural design of wood structures using both allowable stress design and load and resistance factor design. Forty example problems allow direct side-by-side comparison of ASD and LRFD for wood structures. For an overview, click here.

 

Click here for a special notice about changes to southern pine design values.


CodeMaster - Structural Wood Design ASD/LRFD
(2009 IBC, ASCE 7-05, 2005 NDS)

Solved Problems 2005

This CodeMaster contains information about designing typical wood framing members, including glued laminated timber, in accordance with the 2009 IBC, ASCE 7-05, and 2005 NDS. This handy laminated guide explains the design process in ten easy-to-understand steps beginning with determining loads and load combinations.

 

 

 

* Qualified students are those who are full-time students enrolled in a wood design course at a university or college.

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2005 NDS Supplement Lumber Design Values Spreadsheet
NDS

Excel® spreadsheet containing design values for solid sawn dimension lumber and timber as shown in the 2005 National Design Specification (NDS) for Wood Construction Supplement: Design Values for Wood Construction, 2005 Edition.

Buy PDF Now
Non-member $100.00
Member/Student* $50.00

* Qualified students are those who are full-time students enrolled in a wood design course at a university or college.

 

2012 Version coming soon!

2001 ASD Manual
2001 ASD ManualIncludes 2001 National Design Specification for Wood Construction

This document is only available in electronic format.

Buy PDF Now
Non-member $70.00
Member/Student* $35.00

 

The Allowable Stress Design (ASD) Manual for Engineered Wood Construction, 2001 Edition is packaged with the code recognized National Design Specification (NDS) for Wood Construction (2001 Edition), and Supplement: Design Values for Wood Construction. The ASD Manual brings together all required elements for design of wood structures in one comprehensive package. It includes design information and examples for wind and seismic, structural lumber, glued laminated timber, structural-use panels, shear walls and diaphragms, poles and piles, I-joists, structural composite lumber, structural connections (nails, bolts, screws), metal plate connected wood trusses, and pre-engineered metal connectors. Over 900 pages.

For more information, read the published article Overview on Changes to the 2001 NDS. Or, check out the 2001 NDS eCourse. For current code adoptions of this design specification, check here.

Free Downloadable PDF Supplements
2001 ASD/LRFD Wind/Seismic Supplement (33 pages, 1381 KB)

* Qualified students are those who are full-time students enrolled in a wood design course at a university or college.

 

NDS Archives + Historical Design Values

Designers frequently request historic lumber design values. Below are links to several historic documents that may assist in evaluating existing structures:

1922 Design Values for Structural Timber
1944 National Design Specification (NDS) for Stress Grade Lumber and Its Fastenings

(this is a non-printable version of the 1944 NDS - see instructions below for ordering a printable version)

In 1944, the copyrighted first edition of the National Design Specification for Stress-Grade Lumber and Its Fastenings was published by the National Lumber Manufacturers Association. Revisions of the 1944 edition of the Specification were issued in 1948, 1950, 1951, 1952 and 1953. New editions were published in 1957, 1960, 1962, 1968, 1971, 1973, 1977, 1982, 1986, 1991, 1997, 2001, and 2005 (click here for a list of revised supplements and amendments). The scope of the Specification has remained essentially unchanged since the first edition was issued in 1944. The name of the Specification was changed to the National Design Specification for Wood Construction in the 1977 edition. For more information, see the History of Development of the NDS here.

If you would like to purchase archival (printable PDF) copies of pre-2005 editions of the NDS, click the below image.

Buy a PDF

Cost is $50 per copy ($25 for members) and includes shipping and handling. Alternatively, for hard copies, a check or money order made out to the American Wood Council can be mailed to:
American Wood Council
222 Catoctin Circle SE, Suite 201 Leesburg, VA 20175
Attn: NDS Archives.

 

1991 - 1997 NDS Commentary - Historical Development

NDS 1991The Commentary on the 1991 National Design Specification for Wood Construction was first published in 1993. It contains background information concerning provisions of the NDS complete with historical development, example problems, and tables comparing the 1991 design provisions with earlier editions of the standard.

An addendum to the Commentary (dated February 1999), which includes information on 1997 NDS for Wood Construction provisions, is also available online. A Commentary on the 2001 NDS was not developed. The latest 2005 NDS Commentary is available here.

June 1995 Errata to the Commentary is also available.

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