Roof Slope Factors For Roofs

A flat roof has a slope of 2 in 12 or less.

Roof slope factors for roofs.

A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. Roof slope is a very important aspect and it is considered the primary factor in roof design. It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches. Roof pitch affects the actual area of the roof.

Generally roofing types and roofing products are typically divided up into two primary categories steep slope roofing and low slope roofing. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Charts list the slope factor for various pitches usually from 1 12 to 12 12. Divide the rise by the run the run is 12.

There are two main categories of roofing. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. You could also opt for a pvc flat roofing membrane. Conventional slope roof range between 4 in 12 and 8 in 12.

Anything more than 9 in 12 is considered steep. Then you ll be able to measure slope from an unfinished attic space under the roof. 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. A low slope roof is anywhere from 2 in 12 to 4 in 12.

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. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. Steeper sloped roofs are considered. The run always remains constant at 12 inches.

To obtain an accurate roof pitch measurement properly measure the rise and run. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof for roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum.

The headache of using pythagoras and trigonometry can be spared by making use of these charts.