Normal Slope For Roofs

Roof pitches exceeding the level of 9 12 or approximately 37 degrees are termed steep slope roofs.

Normal slope for roofs.

The exact roof slope in degrees is given by the arctangent. Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow. The minimum roof slope for metal roofs is dependent upon the roof profile. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal 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. However from the wind uplift mitigation perspective a 7 12 roof slope can be considered as a two story building due to the higher overall steepness and profile of the roof. A 4 12 pitch being 4 inches of vertical rise over one foot or 12 inches of horizontal run. Definitions vary on when a roof is considered pitched.

Simply put pitch is expressed as rise over run just as the grade is simply this fraction expressed as a percentage. If this isn t practical then perform the same measurement on the underside of. There are advantages and disadvantages to having a steep pitch versus a shallow or low pitch. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials.

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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Pitches above 9 12 are very highly angled and are designated steep slope roofs.

The most commonly used roof pitches fall in a range between 4 12 and 9 12. The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow. Thus pitch is typically greater in areas of high rain or snowfall. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on.

In degrees 10 2 in 12 or 1 in 6 is considered a minimum. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. In roofing it is expressed in inches of vertical rise over inches of horizontal run. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.

These are utilized in residential applications. A roof slope of 7 12 is also good and can provide the additional benefit of helping minimize the effects of wind driven rain.