Roof Slope Angle Chart

Notes to the table above.

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. To obtain an accurate roof pitch measurement properly measure the rise and run. Calculate the roof pitch as the proportion of rise and run. Low slope roofs are from 0 to 3 12 in pitch.

Roof pitch angle and slope factor charts. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Measure the rise of your roof.

Roof pitch is a term describing how steep or flat your roof slope is. Let s say it is equal to 1 5 m. Some sources consider low slope to include 3 12 pitch roofs. Pitch rise run 1 5 6 25.

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. The combination of two numbers are used to display or show the roof pitch. Whatever you decide to go with though finding the best roof pitch chart is going to be very important.

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