Roof pitch angle and slope factor charts roof pitch is a term describing how steep or flat your roof slope is.
Roof slope factgore.
For example if you measure 4 inches the pitch of your roof is 4 12.
For instance the ever last roofing company distributes a chart to the general public.
Roof area in square metres length in metres width in metres slope factor roof area in square feet length in feet width in feet slope factor.
This will give you the rise over run or pitch.
The maths behind this number is that it is the square root of rise run 2 1.
The headache of using pythagoras and trigonometry can be spared by making use of these charts.
The combination of two numbers are used to display or show the roof pitch.
So a roof with four inches of rise every 12 inches horizontally run would have a slope of 4 12 sometimes displayed as 4 12.
For instance if the measurement was 3 your roof slope factor would be 3 12 and you.
The roof slope factor chart also consists of conversion factors to determine the slope of the roof.
The roof slope factor is written as x 12 where x is the vertical distance you measured from roof to level.
Also see our page quick reference.
Charts list the slope factor for various pitches usually from 1 12 to 12 12.
It s just a little math.
You could calculate the slope factor for every single roof pitch but as a public service many roofing companies provide slope factor charts.
Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.
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.
In construction the slope factor can be used to easily calculate the area of a roof.
Degrees to roof pitch rise in run to see a table.
Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.
The following table shows how the same common roof slopes can be expressed using rise in run ratios degrees and percentages.
A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.
After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually.
Roof pitch calculator roof slope calculator the roof pitch calculator is a convenient online tool you can use to quickly assess the pitch of your roof to determine the length of rafters you need.
