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RE: Nominal lumber specifications

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My house was built in California in 1958 using nominal lumber: 1 5/8" thick.  I believe in the '70s, they went to the 1 1/2" nominal thickness x whatever depth dimensions were used.  UBC '67 notes nominal lumber dimensions but I can't find an older code.

Time to place a little bet with an Architect.

-----Original Message-----
From: erik_g(--nospam--at) [mailto:erik_g(--nospam--at)] 
Sent: Monday, April 05, 2010 1:24 PM
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

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