Roof Slope Degrees Chart

To obtain an accurate roof pitch measurement properly measure the rise and run.

Roof slope degrees chart.

In essence a roof pitch chart is provided as a rough guide usually by a roofing company. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. The combination of two numbers are used to display or show the roof pitch.

A ratio of 1 1 62 is known as the golden ratio and therefore the vast majority of roof pitch in degrees charts you see will be working to this ratio at the very least. Pitch rise run 1 5 6 25. The roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

Then you ll be able to measure slope from an unfinished attic space under the roof. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Angle arctan pitch arctan 0 25 14. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Recalculate this value into an angle.