2 1 2 In 12 Roof Pitch

Roof pitch defined and explained.

2 1 2 in 12 roof pitch.

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 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.

A pitch of 2 12 is the minimum pitch for shingles made of asphalt so your roof just barely makes the cut off for one of the most popular roofing material options. We included a roof pitch chart below the 7 12 example image and the calculator below that. 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. Roof pitch designations are comprised of two numbers indicating a ratio.

If this isn t practical then perform the same measurement on the underside of the roof. 8 12 roof pitch 33 angle 33 69 degrees details 9 12 roof pitch 37 angle 36 37 degrees details. 1 12 roof pitch angle 4 76 degrees. Roof pitch degree table.

Most roof s have a pitch in the 4 12 to 9 12 range. 7 12 roof pitch 30 angle 30 26 degrees details. 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.

Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them. Or the colon can replace the slash as in 2 12 or 7 12. Pitch is the term used to describe the angle slope or slant of your roof. For reference 2 12 equates to about 9 5º and 4 12 to about 18 5º.

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