![]() You may need to consult building codes to ensure your roof pitch meets the requirements for the planned roofing material. The roof pitch dictates the angles at which you need to cut your rafters as well as their length.įortunately, you can figure out roof pitch with a simple equation – rise divided by run.įor instance, if your rafter rises 6 inches over every 12 inches of run, your roof pitch will come out to 6:12. The rise and line measurements, on the other hand, depend on your roof pitch. In turn, you should already have your span and run measurements to work off of. Before you can install a roof, the walls must be in place. The span and run measurements hinge on wall dimensions.
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