Roof Slope Angle Chart

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Roof slope angle chart.

Roof pitch is a term describing how steep or flat your roof slope is. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch angle and slope factor charts. 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.

Low slope roofs are from 0 to 3 12 in pitch. Notes to the table above. To obtain an accurate roof pitch measurement properly measure the rise and run. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level.

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

Whatever you decide to go with though finding the best roof pitch chart is going to be very important. Calculate the roof pitch as the proportion of rise and run. Working with a local roofer is going to be your best chance of finding this information including arranging the work to be carried out. Let s say it is equal to 1 5 m.

After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. Calculate the rafter length substituting these values into the following formula.