Roof Slope Defined

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. Low slope roofs are from 0 to 3 12 in pitch. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12.

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

Roof slope defined.

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. Definition of roof slope. Roof pitch defined and explained pitch is the term used to describe the angle slope or slant of your roof. 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.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Slopes greater than 18 12 are found on a frame roofs and some mansard style roofs. See low slope roofing. I e 4 inches of rise per 12 inches one foot of run.

Pitch angle incline slope they all can be used to refer to the steepness of a roof. This ratio is always expressed as inches per foot. Roof slopes are most commonly defined by the rise over run ratio. The pitch of a roof is its vertical rise over its horizontal span.

The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. 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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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. Some sources consider low slope to include 3 12 pitch roofs. Slope is the incline of the roof expressed as a ratio of the vertical rise to the horizontal run where the run is some portion of the span.