2 12 Roof Slope

Standing seam roof systems must have a minimum roof slope of 1 4 12.

2 12 roof slope.

The combination of two numbers are used to display or show the roof pitch. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. 2 12 roof pitch angle 9 46 degrees.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. 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. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.

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. Definitions vary on when a roof is considered pitched. Roof pitch defined and explained. Simply put it s a shallow roof.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. The exact roof slope in degrees is given by the arctangent. Or the colon can replace the slash as in 2 12 or 7 12. In degrees 10 2 in 12 or 1 in 6 is considered a minimum.

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. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Roof pitch is a term describing how steep or flat your roof slope is. 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. 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. Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater.

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.