7 Best Of How To Measure Slope Of Roof Best Resolution Image. In the United States a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. If this distance measures 4 inches you have a 4 in 12.
This is very useful information for many purposes especially for roof framing - the slope sometimes called pitch is calibrated on speed squares. Calculating roof pitch involves dividing the rise by the run and multiplying that number by 12. The rise is measurement from the horizontal truss toward the top of a roof.
And for a roof with a slope of 612 that number 1118 is your roof slope multiplier.
Aug 05 2020 Assuming the roof to be a right triangle the slope of the roof will be measured as the ratio between BD and DC. Lets say it is equal to 15 m. Which is the same as saying a 45 degree slope a 12 in 12 slope or the roof will rise 12. Calculating roof pitch involves dividing the rise by the run and multiplying that number by 12.