Normal Roof Slopes

Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.

Normal roof slopes.

Often found on church towers. I e 4 inches of rise per 12 inches one foot of run. A 4 12 pitch being 4 inches of vertical rise over one foot or 12 inches of horizontal run. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

Pyramid roof pavilion roof. If this isn t practical then perform the same measurement on the underside of. A pyramidal roof with gable ends. Built up roofs should be installed on roof slopes 0 25 12 or greater 2015 irc r905 9 1 except for coal tar built up roofs that have a minimum roof slope of one eighth unit vertical in 12 units horizontal 1 slope.

A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain. Roof slopes are most commonly defined by the rise over run ratio. There are advantages and disadvantages to having a steep pitch versus a shallow or low pitch the most obvious of which is the roof s ability to shed or withstand. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal.

Match the roofing on the covered porch with the main 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. In roofing it is expressed in inches of vertical rise over inches of horizontal run. 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.

Pitches above 9 12 are very highly angled and are designated steep slope roofs. The minimum pitch for shingles is 1 6 which is equivalent to 4. 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. In other words it can be expressed as numerical measure of steepness of the roof. Roof slopes between 4 12 and 6 12 are best for minimizing the wind uplift effects in high wind zones. Typical roof pitch is actually the measure of the roof s slope expressed in ratio.

Determine the minimum slope of the roof based on the roofing material. However from the wind uplift mitigation perspective a 7 12 roof slope can be considered as a two story building due. A hip roof on a square building. Tented a type of polygonal hipped roof with steeply pitched slopes rising to a peak.

What exactly is roof slope. Some well defined standards are followed while deciding about roof pitch but in actuality the slope depends upon the type of roofing material and climatic conditions of the area.