2 1 2 In 12 Roof Pitch

For reference 2 12 equates to about 9 5º and 4 12 to about 18 5º.

2 1 2 in 12 roof pitch. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch degree table. At slopes below 2 12 a granule surfaced asphalt membrane can be installed and many are available in colors to complement the shingle colors. 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.

Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. Roof pitch designations are comprised of two numbers indicating a ratio. In degrees 10 2 in 12 or 1 in 6 is considered a minimum. If a roof rises 2 in a length of 12 this is 2 12 roof pitch.

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. 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. Thus pitch is typically greater in areas of high rain or snowfall. We included a roof pitch chart below the 7 12 example image and the calculator below that.

The exact roof slope in degrees is given by the arctangent. Roof pitch defined and explained. Pitch is the term used to describe the angle slope or slant of your roof. Definitions vary on when a roof is considered pitched.

If this isn t practical then perform the same measurement on the underside of the roof. Most roof s have a pitch in the 4 12 to 9 12 range. The combination of two numbers are used to display or show the roof pitch. The maths behind this number is that it is the square root of rise run 2 1.

Or the colon can replace the slash as in 2 12 or 7 12. Image 1 12 to 12 12 roof pitch 7 12 pitch. The table below shows common roof pitches and the equivalent grade degrees and radians for each. 2 12 roof pitch angle 9 46 degrees.

Some roof specifications may express slope in the typical geometric terms of degrees.