There"s a formula (which I have long forgotten), but you will need to know your live loads (usually snow) for that area. A lumber yard can usually do that for you. As stated below, once you buy the engineered lumber, you may be better off with trusses. If you go the truss route, may look into the upcharge for attic trusses. They are designed for storage and a clear space within them. If you go the ridge beam/rafter path, anything over 20", sometimes 22" in length is special order. And keep in mind, you really don"t want any openings directly under the ridge beam as the header for that opening will be large. Good Luck.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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