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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