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A 2x4 is still 2x4- UNTIL it is run thru a planning machine. The planer removes about a quarter inch from each face, giving a DRESSED dimension of 1.5 x 3.5. However, undressed (means rough cut, unplaned) lumber is still 2x4.

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Q: What year did the US change 2x4 lumber to 1.5x3.5?
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