How Do You Find The Slope Of A Roof

You can measure with twelve feet or twelve yards but in this article we will use twelve inches.

How do you find the slope of a roof.

As a shortcut the roof slope multiplier for any slope can be determined by finding the square root of rise run 1. Low slope roofs are from 0 to 3 12 in pitch. For example when a roof has a slope of 5 12 the roof is 5 inches high for every 12 inches long. First enter the value of the rise and choose the unit of measurement from the drop down menu.

Some sources consider low slope to include 3 12 pitch roofs. For example if the roof slope is 45 then sec 45 1 414213. 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. Roof slopes are measured in units of twelves.

Another way of stating this is that the roof has a rise of 5 and a run of 12. The horizontal distance in the ratio will be 12 while the vertical distance is the measurement you took from the rafters. Then enter the value of the run and choose the unit of measurement from the drop down menu. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Using an online calculator. Find the square root of that result if you know the roof slope in degrees simply find the secant using a scientific calculator. Here are the steps to follow for the roof angle calculator. Just write down the measurements you found.

Notes to the table above. Divide the rise by the run. The slope of your roof is the ratio of the vertical distance or rise of the roof to the horizontal distance or run.