5 Best Of How To Measure Pitch Of Existing Roof HD Image Size. Knowing that will determine what your roofs pitch since the run is 12 inches by default. Let us show you how to accurately determine roof pitch using simple tools level and measurin.
One method to find the pitch is to climb on the roof and measure the rise for a 12 run. For example if the building is 30 feet wide half the building width is 15 feet. Now measure from the end of the level up to the bottom edge of the rafter.
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Or RISE over RUN. The picture below shows the pitch of a 7-12 roof slope meaning that for 12. Place the level horizontally along the rafter until it contacts the roof sheathing avoiding any protruding roof nails. One method to find the pitch is to climb on the roof and measure the rise for a 12 run.