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Nominal lumber specifications

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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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