By hand, you can create a proportion between your fixed roof pitch (rise over run, like 6:12) and actual roof run to solve for the missing value (actual rise). Remember that you should already know the run of the roof. Once you zero in on your roof pitch, you can determine the rise and line measurements. Any lower and you will need to use a flat roof material to meet standards. For example, the International Residential Code requires roof slopes no smaller than 2:12 for asphalt shingles. 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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