Slope Of A 2 12 Roof

Common roof pitches and equivalent grade degree and radian angles.

Slope of a 2 12 roof. They have a pitch ranging from 4 12 to 9 12. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

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. What is the minimum slope for an asphalt shingle roof. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal.

This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units. The following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. Minimum roof slope roof pitch r905 3 2. You can also calculate roof pitch even without using a roof slope calculator.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Conventional roofs are the easiest to construct and you can walk on them safely. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater.

The best roofs for a 2 12 pitch roof pitch basics. These roofs have a pitch less than 4 12. Then you ll be able to measure slope from an unfinished attic space under the roof. Asphalt shingles continue to be the most widely installed roof covering option in north america.

Most roof s have a pitch in the 4 12 to 9 12 range. Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree.