1 To 2 Roof Slope

Roof pitch designations are comprised of two numbers indicating a ratio.

1 to 2 roof slope.

Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. Simply put it s a shallow roof. A 1 2 percent slope is used for applications that involve drainage of land and concrete such as patios and sidewalks. 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.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. The term pitch and slope are often used interchangeably which is incorrect. 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. 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.

A 12 to 24 pitch is expressed as 1 2. Generally such roofs have a pitch ranging from 1 2 12 to 2 12. Pitch is the term used to describe the angle slope or slant of your roof. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

0 pitch 1 00x the roof area. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. You can go by the measurements taken by walking the roof. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.

The formula for calculating a 1 2 percent slope can be approached in at least two ways. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. 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. Roof pitch defined and explained. The maths behind this number is that it is the square root of rise run 2 1. Since this is a flat roof or nearly flat roof.

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