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how to compute roof pitch. The roof pitch is a measure of roof steepness. Roof Pitch Calculator Results Explained Slope - The slope of a roof is represented as X12 where X is the number of inches in rise for every 12 inches of run.
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A A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. Use our roof pitch calculator to find the pitch of your roof.
Use the Pythagorean theorem to calculate the RUN.
For example you will need to figure out the exact number of shingles required to cover the entire roof area. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 412.
