0 pitch 1 00x the roof area.
1 to 4 ratio roof slope.
Horizontal to vertical slope ratio to 1 percent slope degrees slope slope ratio.
1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42.
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.
4 3 1 slope.
18 4o inches per foot.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
We can divide roofs into the following categories.
The pitch of a roof is its vertical rise over its horizontal span.
Most roof s have a pitch in the 4 12 to 9 12 range.
A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.
Since this is a flat roof or nearly flat roof.
Calculating a slope gradient.
Roof pitch is often expressed as a ratio between rise and run in the form of x 12.
You can divide roofs into these categories.
Generally such roofs have a pitch ranging from 1 2 12 to 2 12.
Flat roofs are not perfectly flat in reality they need a small slope for water runoff.
Flat roofs which aren t perfectly flat require a small slope to allow for water runoff.
For instance if you travel 3 inches vertically and 3 feet 36 inches horizontally the slope would be 3 36 or 1 12.
A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.
Often you express roof pitch as the ratio between the rise and the run in the form of x 12.
You can go by the measurements taken by walking the roof.
For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
3 1 or 3 to 1 percent slope.
Both numbers must use the same units.
Slope gradients are written as y x where y is a single unit in rise and x is the run.
This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal.
A ratio of 1 1 62 is known as the golden ratio and therefore the vast majority of roof pitch in degrees charts you see will be working to this ratio at the very least.
If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio.
