The dimensions for post frame buildings are normally measured from the outside of the purlins. So with 2x4 purlins, the dimensions should be the outside edges of the posts plus three inches (1-1/2" x 2).
It is not easy to get the posts lined up correctly, and by short-cutting the process the builder can save a lot of time and money. I'll bet he deliberately set the posts undersize, since it's easier to trim the siding to fit than it is to stretch it. They can also be much sloppier when they install the siding, since they don't have to worry about running short when they have a foot to spare. (I heard of one builder who ran short on siding, so he drove his pickup lengthwise down a sheet to flatten out the ribs.)
While you're waiting for this so-called builder to show up, check to see if the posts are plumb. They won't be perfect, since most posts are bowed, but they should be close.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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