Roof Slope Angle Chart

To obtain an accurate roof pitch measurement properly measure the rise and run.

Roof slope angle 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. Notes to the table above. Measure the rise of your roof. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.

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. Let s say it is equal to 1 5 m. The combination of two numbers are used to display or show the roof pitch. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Working with a local roofer is going to be your best chance of finding this information including arranging the work to be carried out. Calculate the rafter length substituting these values into the following formula. 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. 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.

Some sources consider low slope to include 3 12 pitch roofs. Roof pitch angle and slope factor charts.