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-2012 editions of the NDS, click the below image.
Cost is $50 per copy/year (NOT all copies of the NDS prior to 2012), $25 for members.
Errata and addendums that have been developed for AWC documents are available here in PDF format.