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After struggling with hip rafters and talking to an old-timer or two, novice framers discover that joining two roofs isn't that tough — for hips and valleys you just cut all your bevels at 45 degrees, and use 17 instead of 12 for the run on the framing square. Then it happens: That bid you submitted for the job with the adjoining, unequally pitched roofs gets accepted, and you've got to figure out a way to frame it. One approach is to order twice the framing lumber required and keep cutting hips and valleys until you get it right. Another is to buy a fancy framing calculator and take a course in trigonometry. Or you can use the Zepp