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Message: <blockquote data-quote="ultimate157" data-source="post: 2592948" data-attributes="member: 566638">2x4's mass produced are 1.5" x 3.5"  The reason for this is its cheaper to produce smaller 2x4's that still do the job (holding the required amount of weight) and they can produce more from the source wood.  The smaller 2x4's get away with it because building code has changed the required spacing of 2x4's from 18" center to center to 16" (I'm pretty sure about that ...)If you get 3/4" MDF it should be 3/4" thick.  And it is.  I just measured some I have in the garage.</blockquote>

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