Roof Slope Defined

I e 4 inches of rise per 12 inches one foot of run.

Roof slope defined.

Roof slope can also be described as the angle of change in elevation expressed in one of several forms. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Low slope roofs are from 0 to 3 12 in pitch. Definition of roof slope.

Roof pitch defined and explained pitch is the term used to describe the angle slope or slant of your roof. Roof pitch designations are comprised of two numbers indicating a ratio. This ratio is always expressed as inches per foot. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.

Pitch angle incline slope they all can be used to refer to the steepness of a roof. See low slope roofing. Roof slopes are most commonly defined by the rise over run ratio. 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.

Roof slope is the amount of vertical change in height as a ratio of horizontal distance traveled also expressed as inches of rise per foot of horizontal run or cm of rise per m of horizontal run. However most often a ratio of pitch also fraction is slang used for the more useful slope of rise over run of just one side half the span of a dual pitched roof. Some sources consider low slope to include 3 12 pitch roofs. Slopes greater than 18 12 are found on a frame roofs and some mansard style roofs.

In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The pitch of a roof is its vertical rise over its horizontal span.