Roof Slope Angle Chart

Some sources consider low slope to include 3 12 pitch roofs.

Roof slope angle chart.

Then you ll be able to measure slope from an unfinished attic space under the roof. Pitch rise run 1 5 6 25. Roof pitch is a term describing how steep or flat your roof slope is. Measure the rise of your roof.

Roof pitch angle and slope factor charts. Low slope roofs are from 0 to 3 12 in pitch. The combination of two numbers are used to display or show the roof pitch. To obtain an accurate roof pitch measurement properly measure the rise and run.

After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. Working with a local roofer is going to be your best chance of finding this information including arranging the work to be carried out. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. 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.

Calculate the roof pitch as the proportion of rise and run. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Let s say it is equal to 1 5 m. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

Calculate the rafter length substituting these values into the following formula. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.