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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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