Roof Pitch Multiplier Table

Determine how many square feet of roof area a building has by measuring from the ground.

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. Now solving for c in the equation above gives. If you know the pitch of a roof you can use the numbers in the following pitch table to do the following. With pitch under 3 you can easily walk on the roof to get the exact measurements as that is usually a flat roof.

This table provides the hip and valley factor for common roof pitches as well as the underlying equation for the factor. How to find your what roof pitch category. We excluded roof multipliers for pitch below 3 and above 12 for the following reasons. 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.

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. The formula for the roof pitch multiplier comes from the famous pythagorean theorem. The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory. Roof pitch multiplier table.