Determine how many square feet of roof area a building has by measuring from the ground.
Roof pitch multiplier table.
The hip and valley factor is a number that is multiplied by the actual run horizontal distance of a common rafter to determine the length of a hip or valley rafter.
Roof pitch multiplier table.
The formula for the roof pitch multiplier comes from the famous pythagorean theorem.
With pitch under 3 you can easily walk on the roof to get the exact measurements as that is usually a flat roof.
How to find your what roof pitch category.
This table provides the hip and valley factor for common roof pitches as well as the underlying equation for the factor.
This roof pitch table displays a multiplier for adding for different roof pitches.
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.
If you know the pitch of a roof you can use the numbers in the following pitch table to do the following.
Now solving for c in the equation above gives.
Where a is the rise of the roof b is the run of the roof and c is the rafter hypotenuse of the triangle with side lengths a and b.
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.