What year did dimensional lumber change from 1-5/8 thick to 1-1/2″?
Pretty sure same year a 2×8 went from 7-1/2″ to 7-1/4 inch, etc.
1954?, could not find a good web reference for the date, think Weyerhauser was the instigator of the reduction, recall a pop. science article about relative strengths, but cannot find it.
Was anybody here building professionally in ’54?