As everybody else says, depends on where you are. In Oklahoma, pole barns are built with rafters on 5 ft centers, an 11 ft span could be 2x6, 2x8 for 15 ft. Use 2x4 purlins spaced based the metal you are using. 29 ga we put purlins on 2 ft centers. We only have about 1 ft snow load but lots of wind load. If posts are 10 ft on center, run a 2x6 on each side of the posts and put a stub post at the 5 ft mark to nail that rafter to. This design is good for Oklahoma but will not be good for 4 ft of snow load.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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