Or the colon can replace the slash as in 2 12 or 7 12.
2 1 2 in 12 roof pitch.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
Image 1 12 to 12 12 roof pitch 7 12 pitch.
At slopes below 2 12 a granule surfaced asphalt membrane can be installed and many are available in colors to complement the shingle colors.
The maths behind this number is that it is the square root of rise run 2 1.
Some roof specifications may express slope in the typical geometric terms of degrees.
Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.
1 12 roof pitch angle 4 76 degrees.
If this isn t practical then perform the same measurement on the underside of the roof.
If a roof rises 1 in a length of 12 this is 1 12 roof pitch.
Roof pitch designations are comprised of two numbers indicating a ratio.
7 12 roof pitch 30 angle 30 26 degrees details.
8 12 roof pitch 33 angle 33 69 degrees details 9 12 roof pitch 37 angle 36 37 degrees details.
Roof pitch degree table.
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 ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.
A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.
Pitch is the term used to describe the angle slope or slant of your roof.
Roof pitch defined and explained.
The combination of two numbers are used to display or show the roof pitch.
For reference 2 12 equates to about 9 5º and 4 12 to about 18 5º.
We included a roof pitch chart below the 7 12 example image and the calculator below that.