The 2005 Edition of the National Design Specification for Wood Construction is now available. It 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.
The 2005 SDPWS 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).
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.
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.
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.
2001 ASD Manual
including the 2001 National Design Specification for Wood Construction
This document is only available in electronic format. To purchase an electronic copy, click here.
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, shearwalls 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.
Several errata and addendums
have been developed for the NDS and ASD Manual. These are available
in PDF format here.
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:
If you would like to purchase archival (printable PDF) copies of
pre-2001 editions of the NDS, click here.
Cost is $50 per copy ($25 for members) and includes shipping and handling. Alternatively, a check or money order made out to the American Forest & Paper
Association can be mailed to: 1111 Nineteenth St., NW, #800, Washington, DC 20036, Attn: American
Wood Council.
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. 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 click 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.
1991
- 1997 NDS Commentary - Historical Development
The 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.
Note: Click on the cover of a document on the left to download a free "view-only" PDF version (except for the NDS and Example problems). The "view-only" version cannot be printed, nor can text be copied. To purchase a printable PDF that also allows text to be copied, click on the "Buy a PDF" button at the top of this page.
