To use this method there are 3 possible places to take your measurements. This method tends to be more accurate because no layers of roofing are involved. The measurements are taken from the bottom of the rafters, the procedure to calculate roof pitch is the same. Be careful with this method as a roof with many layers of shingles, or any type of roofing that is irregular can give you less than precise results. Simply mark a level at 12″, hold it perfectly level and measure from the roof surface to your 12″ mark, this will give you the rise. The measurements are taken from on top of the roof. The example to right shows 2 different ways to determine or calculate roof pitch, also called roof slope. (Also referred to as roof slope or roof slant.) So what does the 7/12 in the example to the right mean? The 7 means that the roof rises 7″ for every 12″ it runs. Roof pitch calculator is determined by the number of inches it rises vertically for every 12 inches it extends horizontally. How to determine or calculate roof pitch or roof slope Most shingle options work with the most common roof pitches, but some roofs may require higher-quality shingles and additional supports or reinforcements.
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