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.

Roof slope angle chart.

Then you ll be able to measure slope from an unfinished attic space under the roof. Roof pitch is a term describing how steep or flat your roof slope is. 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.

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. Some sources consider low slope to include 3 12 pitch roofs. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

Whatever you decide to go with though finding the best roof pitch chart is going to be very important. Roof pitch angle and slope factor charts. Pitch rise run 1 5 6 25. 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. 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. Notes to the table above.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Calculate the roof pitch as the proportion of rise and run.