Normal Roof Slopes

The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope.

Normal roof slopes.

Thus a 4 12 pitch would be a 33 slope. You can also divide the rise over run multiply by 100 and get a percentage. The most commonly used roof pitches fall in a range between 4 12 and 9 12. 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.

The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on. Pyramid roof pavilion roof. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

Tented a type of polygonal hipped roof with steeply pitched slopes rising to a peak. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. A pyramidal roof with gable ends. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles.

Often found on church towers. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. The typical roof slope follows specific materials and design techniques to ensure perfect safety from leakage. A multi tiered and spired roof commonly found in burmese royal and buddhist architecture.

Pitches above 9 12 are very highly angled and are designated steep slope roofs. The requirements for an asphalt shingles roof are contained in the international building code. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

Roof slopes between 4 12 and 6 12 are best for minimizing the wind uplift effects in high wind zones. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. A 4 12 pitch is around 18 5 degrees but not exactly.

Helm roof rhenish helm. A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain. A hip roof on a square building.