![]() Using the opposite side of the square, draw a line down the side of the board. Rotate the square until the correct pitch is in line with the board’s edge. Put the pivot point, where the square’s straight edge meets the lip side, at the rafter board’s top edge. Spacing the rafters 24 inches apart, you’ll need 15 rafters for a 30-foot long building. As an example, a building that’s 24 feet wide has a rafter run of 12. Divide the rafter’s span by two to find the rafter’s run. Rafter span in order to evaluate how many rafters are needed. ![]()
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