Using one end of the shed floor that is the same width as the rafter assemblies, make a line on the exact center of the floor. then measure up from the edge of the shed floor and mark the overall height of the rafter assembly. this measurement can be found on the rafter plans. test fit the rafters by setting the rafter seats on the edge of the.. A shed roof slopes in one direction only. easy rafters is designed to calculate shed roofs that are framed to a ledger board nailed against a vertical wall, not freestanding shed roofs supported by walls at both ends. it is possible to calculate a birdsmouth near the top of the rafter for a freestanding shed roof by checking the kneewall. Another common design in the northeast is the “saltbox,” which is a gable roof with one longer side. these days “cut-ups,” or roofs with a lot of valleys, dormers and other features, are increasingly popular. in many cases with purchased house plans, the details of the roof construction, including rafter design, are included..
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