2 12 Roof Slope

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

2 12 roof slope.

If a roof rises 2 in a length of 12 this is 2 12 roof pitch. Asphalt shingles continue to be the most widely installed roof covering option in north america. Roof pitch defined and explained. Thus pitch is typically greater in areas of high rain or snowfall.

Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12. Simply put it s a shallow 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. Roof pitch is a term describing how steep or flat your roof slope is.

The exact roof slope in degrees is given by the arctangent. Most roof s have a pitch in the 4 12 to 9 12 range. Roof pitch designations are comprised of two numbers indicating a ratio. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. That means the roof doesn t shed water as easily as steeper roofs which is why choosing the right type of roofing material is so important. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Definitions vary on when a roof is considered pitched. Modified bitumen roofing requires a minimum roof pitch of 1 4 12 or greater. The table below shows common roof pitches and the equivalent grade degrees and radians for each. In degrees 10 2 in 12 or 1 in 6 is considered a minimum.

The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. Pitch is the term used to describe the angle slope or slant of your roof. Or the colon can replace the slash as in 2 12 or 7 12. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.

The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. Standing seam roof systems must have a minimum roof slope of 1 4 12.