Flat Roof Pitch Definition

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

Flat roof pitch definition.

The way we measure the slope is to measure the roof s rise over 12 inches. In building construction roof pitch is the steepness of a roof quantified as a ratio or as number of angular degrees that one exposure surface deviates from horizontal level. See low slope roofing. Slopes greater than 18 12 are found on a frame roofs and some mansard style.

The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

An example for a steep sloped roof is 8 12. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. A roof surface may be either functionally flat or pitched. Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof.

Anything pitched 3 and 12 or less is considered a low sloped roof. If a roof rises one inch over 12 inches it s called a 1 in 12 and it would be a low slope. Roofers express roof slope as rise or pitch measured in inches of vertical rise per foot of horizontal distance or run. Roof pitch or slope is the angle of the roof surface above the flat or horizontal plane.

To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. Low slope roofs are from 0 to 3 12 in pitch. Flat roof slope the slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. Some sources consider low slope to include 3 12 pitch roofs.