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How-to-frame-a-roof-pitch, the framing of a basic gable roof is based on a right-angle triangle, and the various roof framing components fit the triangle. the rise, or height of the roof at its peak, is the altitude of the triangle; the run, or half the building span, is the base of the triangle; and the line length, measurement from the roof peak to the building wall, is the hypotenuse.