9 Best Of How To Determine Slope Of Existing Roof Free Download. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. For example if your roof rises 7 inches for every 12 inches of horizontal run then your roof has a 7-in-12 pitch.
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. Overhang Enter the horizontal overhang of the roof including the thickness of the fascia board. As a sanity check we confirm that the tangent of 45 degrees is 1 or that two opposed 45 degree or 12 in 12 slope roof surfaces will form a 90 degree angle where they meet at the ridge and will form 45 degree angles where they meet the wall top plate or with respect to any horizontal line in the building.
Feb 10 2021 pitch tan angle where angle is the roof pitch expressed in degrees.
Roof slope is expressed as the unit rise over the unit run. Roof slope is expressed as the unit rise over the unit run. First find the slope by finding the tangent of the degrees eg. Climb into the attic.