Roof Pitch Multiplier Table

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.

Roof pitch multiplier table.

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. 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. We excluded roof multipliers for pitch below 3 and above 12 for the following reasons. Roof pitch multiplier table.

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. How to find your what roof pitch category. This roof pitch table displays a multiplier for adding for different roof pitches.

Accurate roof calculations are achieved using this table and all you need to do is measure the roof width and length and then you are ready to do a roof pitch measurement. 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. With pitch under 3 you can easily walk on the roof to get the exact measurements as that is usually a flat roof. The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory.