Roof Pitch Multiplier Table

With pitch under 3 you can easily walk on the roof to get the exact measurements as that is usually a flat roof.

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. The roof pitch multiplier table is very helpful in giving correct and reliable roof measurements and uses pythagorean theory. 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.

We excluded roof multipliers for pitch below 3 and above 12 for the following reasons. Determine how many square feet of roof area a building has by measuring from the ground. If you know the pitch of a roof you can use the numbers in the following pitch table to do the following. Roof pitch multiplier table.

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. Now solving for c in the equation above gives. How to find your what roof pitch category.