1 2 12 Pitch Roof

Roof pitch designations are comprised of two numbers indicating a ratio.

1 2 12 pitch roof. 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. Steeper slopes increase the sail effect that makes them susceptible to wind. To convert between american roofing ratios and pitch degrees follow these steps. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind.

The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. Or the colon can replace the slash as in 2 12 or 7 12. Divide the first part of the ratio by 12 to work out the pitch. Conventional from 4 12 1 in 3 to 9 12 3 in 4.

Lower slopes don t handle wind driven rain as well. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Pitch is the term used to describe the angle slope or slant of your roof. A 12 12 pitch roof has a pitch angle of 45.

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. The combination of two numbers are used to display or show the roof pitch. 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.

We included a roof pitch chart below the 7 12 example image and the calculator below that. Most roof s have a pitch in the 4 12 to 9 12 range. The basic ranges of pitch are not uniformly defined but range from flat which are not perfectly flat but sloped to drain water up to 1 2 12 to 2 12 1 in 24 to 1 in 6. 2 12 roof pitch angle 9 46 degrees.

If this isn t practical then perform the same measurement on the underside of the roof. What degree angle is a 12 12 pitch roof. Find the inverse tangent of the pitch to find the angle in degrees. If a roof rises 2 in a length of 12 this is 2 12 roof pitch.

Roof pitch defined and explained. 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.