Roof Pitch Multiplier Table

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

Roof pitch multiplier table.

How to find your what roof pitch category. 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. 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.

With pitch under 3 you can easily walk on the roof to get the exact measurements as that is usually a flat roof. Determine how many square feet of roof area a building has by measuring from the ground. 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. 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. The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory. The formula for the roof pitch multiplier comes from the famous pythagorean theorem.