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 - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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