Hip and valley construction, including the proper sizing of hip and valley rafters, is an aspect of wood frame construction that is not generally well understood and is often poorly executed. There are two important structural aspects of hip and valley rafters: sizing the member and providing support at the ends. In plan view, hip and valley framing are similar: In either case, a main structural member — the hip rafter or valley rafter — runs diagonally between the high (ridge) corner and the low (eaves) corner of an area of intersection of two sloping roofs. At outside corners, this is a hip rafter; at inside corners, it's a valley rafter. Because their geometry is similar, the same
