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RE: Nominal lumber specifications

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I just about went blind trying to read that 1944 NDS attachment.  Your purpose was to sell these documents here?


From: Showalter, Buddy [mailto:Buddy_Showalter(--nospam--at)] On Behalf Of AWC Info
Sent: Tuesday, April 06, 2010 12:37 PM
To: seaint(--nospam--at)
Subject: Nominal lumber specifications


The 1944 NDS® paragraph 200-C discusses net sizes versus nominal sizes:


The first Department of Commerce Voluntary Product Standard PS20 for dimension lumber was established in 1970. That was the first recognized “national” standard.




John "Buddy" Showalter, P.E.
Director, Technical Media


American Wood Council

1111 19th Street, NW, Suite 800
Washington, DC 20036

AWC logo w tagline

The American Wood Council (AWC) is the wood products division of the American Forest & Paper Association (AF&PA). AWC develops internationally recognized standards for wood design and construction. Its efforts with building codes and standards, engineering and research, and technology transfer ensure proper application for engineered and traditional wood products.

The guidance provided herein is not a formal interpretation of any AF&PA standard. Interpretations of AF&PA standards are only available through a formal process outlined in AF&PA's standards development procedures.




From:  <erik_g(--nospam--at)>

To: seaint(--nospam--at)

Subject: Nominal lumber specifications


Does anyone have any information when the "UBC" or other building codes for California 1st started specifying nominal lumber dimensions? For example 1.5" x 3.5" instead of 2" x 4".


We have a project and the architect is saying that nominal lumber began to be used during the 1970's, but I have seen homes in the 50's and 60's framed with nominal lumber and not "rough" dimensions.


Any information would be greatly appreciated