Roof Slope Factors For Roofs

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.

Roof slope factors for roofs. There are two main categories of roofing. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Roof slope is a very important aspect and it is considered the primary factor in roof design. Charts list the slope factor for various pitches usually from 1 12 to 12 12.

You could also opt for a pvc flat roofing membrane. Divide the rise by the run the run is 12. You could calculate the slope factor for every single roof pitch but as a public service many roofing companies provide slope factor charts. 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. 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. The headache of using pythagoras and trigonometry can be spared by making use of these charts. A flat roof has a slope of 2 in 12 or less.

Conventional slope roof range between 4 in 12 and 8 in 12. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. The roof slope factor chart also consists of conversion factors to determine the slope of the roof. Generally roofing types and roofing products are typically divided up into two primary categories steep slope roofing and low slope roofing.

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. It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches. 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. A low slope roof is anywhere from 2 in 12 to 4 in 12.

Then you ll be able to measure slope from an unfinished attic space under the roof. 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 pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used. Roof pitch affects the actual area of the roof.

Steeper sloped roofs are considered.