Roof Slope Degrees Chart

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Roof slope degrees chart.

Then you ll be able to measure slope from an unfinished attic space under the roof. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. 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.

Finally you can find the roof pitch in the form of x 12. To obtain an accurate roof pitch measurement properly measure the rise and run. Recalculate this value into an angle. Calculate the roof pitch as the proportion of rise and run.

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. 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. In essence a roof pitch chart is provided as a rough guide usually by a roofing company.

The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. 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.