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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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