1 2 12 Pitch Roof

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

1 2 12 pitch roof.

Conventional from 4 12 1 in 3 to 9 12 3 in 4. Lower slopes don t handle wind driven rain as well. To convert between american roofing ratios and pitch degrees follow these steps. Find the inverse tangent of the pitch to find the angle in degrees.

Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them. Roof pitch designations are comprised of two numbers indicating a ratio. 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. Divide the first part of the ratio by 12 to work out the pitch.

If a roof rises 1 in a length of 12 this is 1 12 roof pitch. Low slope roofing which requires special materials and techniques to avoid leaks and ranges from 1 12 2 12 to 4 12 1 in 3. 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. Pitch is the term used to describe the angle slope or slant of your roof.

If this isn t practical then perform the same measurement on the underside of the roof. Roof pitch degree table. The combination of two numbers are used to display or show the roof pitch. What degree angle is a 12 12 pitch roof.

1 12 roof pitch angle 4 76 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. Most roof s have a pitch in the 4 12 to 9 12 range. Image 1 12 to 12 12 roof pitch 7 12 pitch.

Roof pitch defined and explained. A 30 degree roof slope 7 12 pitch is the right pitch to aerodynamically handle high wind. Steeper slopes increase the sail effect that makes them susceptible to wind. The 30 degree 7 12 roof recommendation is backed up by testing according to the publication science daily.

Or the colon can replace the slash as in 2 12 or 7 12. 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. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.