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.

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. Recalculate this value into an angle. 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. Finally you can find the roof pitch in the form of x 12. Then you ll be able to measure slope from an unfinished attic space under the roof. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.

In essence a roof pitch chart is provided as a rough guide usually by a roofing company. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. To obtain an accurate roof pitch measurement properly measure the rise and run. Pitch rise run 1 5 6 25.

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