How Do You Find The Slope Of A Roof

Roof slopes are measured in units of twelves.

How do you find the slope of a roof. Using an online calculator. Divide the rise by the run. There s no need to simplify them. For example if you find 4 inches of height with the tape measure at the 12 inch mark on the level your slope is 4 12 or 4 in 12.

Low slope roofs are from 0 to 3 12 in pitch. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Some sources consider low slope to include 3 12 pitch roofs. As a shortcut the roof slope multiplier for any slope can be determined by finding the square root of rise run 1.

First enter the value of the rise and choose the unit of measurement from the drop down menu. The slope of your roof is the ratio of vertical distance rise to horizontal distance run. Here are the steps to follow for the roof angle calculator. Notes to the table above.

Then enter the value of the run and choose the unit of measurement from the drop down menu. For example if the roof slope is 45 then sec 45 1 414213. Finally enter the value of the rafter length and. Another way of stating this is that the roof has a rise of 5 and a run of 12.

Just write down the measurements you found. The slope of your roof is the ratio of the vertical distance or rise of the roof to the horizontal distance or run. For example when a roof has a slope of 5 12 the roof is 5 inches high for every 12 inches long.