Do this on all four corners if applicable. On both long walls, mark for the end common rafter by measuring from the short wall and marking the run (sets ahead). Use the run determined by the hip roof rafter calculator to mark the center rafter on the short side. Hip roofs require a slightly different approach than gable roofs. It should be breaking half way on the ridge. Do not forget to hold on to it until the third rafter is attached to the end of the ridge board. Nail the ridge to the rafters and set the other end on the temporary prop. Remove the block from between the rafters and slide in the ridge board from the top. Be sure to have enough hands available for hanging the ridge. Take a measurement for a temporary prop to go from the bottom of the ridge to the top of a block across the ceiling joists.
Brace the rafters from the top down and plumb the gable. Nail on a 2 x 4 like collar tie right below the temporary block. The block should the same length as the ridge board is wide. Pay special attention the the fit of the cuts. Place a temporary 2 x 4 block in between the rafters. Prepare a ridge board and then set up a safe scaffold. Use the pattern to mark out three rafters and saw them. Use the dimensions determined by the calculator to lay out a rafter pattern. Use one of these rafter calculators to determine the rise, the run, the length of the rafter, and the height of the scaffold.
Scatter sheets of decking all over the joists for safer working conditions. If there is a ceiling, then it should be complete according to these specifications with all lateral braces nailed down properly. Be sure that the span is the same on both ends, the bearing walls are straight, and are properly braced. Complicated roof systems can have spans that are very difficult to determine and should only be attempted by experienced professionals. This is typically the distance from the outside of the wall to the outside of the wall. The first step is to take a direct measurement of the span. This guide includes step by step approaches, and state of the art calculators for every scenario.
Rafter construction how to#
Learn how to erect complicated roof systems with rafters.
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