1 To 2 Roof Slope

Or the colon can replace the slash as in 2 12 or 7 12.

1 to 2 roof slope.

Roof pitch defined and explained. Simply put it s a shallow roof. The term pitch and slope are often used interchangeably which is incorrect. A 12 to 24 pitch is expressed as 1 2.

0 pitch 1 00x the roof area. 1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42. Low pitched roofs are generally difficult to maintain and you need special materials to prevent leaks. These roofs have a pitch less than 4 12.

The maths behind this number is that it is the square root of rise run 2 1. It also figures significantly in conservation farming irrigation where the land most vulnerable to rain erosion gets a 1 2 percent slope. The formula for calculating a 1 2 percent slope can be approached in at least two ways. You can go by the measurements taken by walking the roof.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. A 1 2 percent slope is used for applications that involve drainage of land and concrete such as patios and sidewalks. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. 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.

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 ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

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. Generally such roofs have a pitch ranging from 1 2 12 to 2 12. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. For example given a roof with a rise of 4 feet and a span of 24 feet the pitch is 1 to 6 pitch which can be expressed as the fraction of 1 6.

Most roof s have a pitch in the 4 12 to 9 12 range. Since this is a flat roof or nearly flat roof. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit.