Roof Pitch Multiplier Table

Roof pitch multiplier table.

Roof pitch multiplier table.

This roof pitch table displays a multiplier for adding for different roof pitches. The formula for the roof pitch multiplier comes from the famous pythagorean theorem. Determine how many square feet of roof area a building has by measuring from the ground. 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.

The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory. We excluded roof multipliers for pitch below 3 and above 12 for the following reasons. 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.

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. 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. 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. Now solving for c in the equation above gives.