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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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