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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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