Roof Slope Angle Chart

After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.

Roof slope angle chart.

Some sources consider low slope to include 3 12 pitch roofs. Measure the rise of your roof. 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. Working with a local roofer is going to be your best chance of finding this information including arranging the work to be carried out.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Notes to the table above. Roof pitch angle and slope factor charts. Calculate the rafter length substituting these values into the following formula.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. 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. To obtain an accurate roof pitch measurement properly measure the rise and run. Whatever you decide to go with though finding the best roof pitch chart is going to be very important.

The combination of two numbers are used to display or show the roof pitch. Pitch rise run 1 5 6 25. 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.

Calculate the roof pitch as the proportion of rise and run. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.