Normal Roof Slopes

Thus a 4 12 pitch would be a 33 slope.

Normal roof slopes.

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. Often found on church towers. Roof slopes between 4 12 and 6 12 are best for minimizing the wind uplift effects in high wind zones. The requirements for an asphalt shingles roof are contained in the international building code.

Pitches above 9 12 are very highly angled and are designated steep slope roofs. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.

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. Tented a type of polygonal hipped roof with steeply pitched slopes rising to a peak. If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. A multi tiered and spired roof commonly found in burmese royal and buddhist architecture.

The most commonly used roof pitches fall in a range between 4 12 and 9 12. Helm roof rhenish helm. A pyramidal roof with gable ends. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

The typical roof slope follows specific materials and design techniques to ensure perfect safety from leakage. A 4 12 pitch is around 18 5 degrees but not exactly. The minimum slope for lapped non soldered seam metal roofs with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.

A hip roof on a square building. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. Pyramid roof pavilion roof.

A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on. You can also divide the rise over run multiply by 100 and get a percentage.