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 - The Great Escape - by Dave Hollrah. It all began Monday with a little baling of second crop on the lake shore field, and as I drove out past my sister and her hubby's place, this small calling sound could be heard from the general direction of their manure pile. Out of the yard, over the cows and bale piles, through the dozer piles, poplars, and brush, out onto the ditch grade road, past the noisy 6.2 diesel engine pulling my well traveled Suburban along. Well it sure didn't take me long to figure out what it was because I alrea
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