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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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