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how to calculate roof slope. How do you calculate the slope of a roof. 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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Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. Rafter² rise² run² from the Pythagorean theorem. Call Us 315 926-1777.
Depending whether the roof area is measured horizontally possibly from a drawing or photograph a correction factor is necessary to determine the actual area of the roof.
The roof pitch is the slope of the rafter. Therefore mark off 12 inches on the level and place it down horizontally against the roof rafter. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12-inch.
