Roof Slope Conversion Table

Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree.

Roof slope conversion table.

Roof pitch is the slope created by the rafter. Roof pitch on the form x 12 can be expressed in grades as. To obtain an accurate roof pitch measurement properly measure the rise and run. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

You can find the roof pitch in the form of x 12 like 4 12 or 9 12. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. 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. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. Then you ll be able to measure slope from an unfinished attic space under the roof. S grade 1 m 2 m 50 slope and roof pitch. The combination of two numbers are used to display or show the roof pitch.

Finding the calculations needed to take things a step further with the roof conversion or development is going to take a lot of time and you need to have access to the best charts and software possible. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level.