NDS® paragraph 200-C discusses net sizes versus nominal sizes: http://www.awc.org/Standards/nds.html#archives
The first Department of Commerce Voluntary Product
Standard PS20 for dimension lumber was established in 1970. That was the
first recognized “national” standard.
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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.
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
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"
Any information would be greatly