2 12 Roof Slope

Roof pitch defined and explained.

2 12 roof slope.

Roof pitch is a term describing how steep or flat your roof slope is. 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. In degrees 10 2 in 12 or 1 in 6 is considered a minimum. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Standing seam roof systems must have a minimum roof slope of 1 4 12. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. If a roof rises 2 in a length of 12 this is 2 12 roof pitch. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12.

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. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Definitions vary on when a roof is considered pitched. The combination of two numbers are used to display or show the roof pitch. 2 12 roof pitch angle 9 46 degrees. Pitch is the term used to describe the angle slope or slant of your roof.

Modified bitumen roofing requires a minimum roof pitch of 1 4 12 or greater. Thus pitch is typically greater in areas of high rain or snowfall. Asphalt shingles continue to be the most widely installed roof covering option in north america. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The exact roof slope in degrees is given by the arctangent. Roof pitch designations are comprised of two numbers indicating a ratio. Or the colon can replace the slash as in 2 12 or 7 12.

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