Roof Multiplier For Pitch

Let s assume the pitch is 8 12.

Roof multiplier for pitch.

Enter your numbers into this go to roof pitch calculator. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. Get your roof size by using this roof pitch calculator. Step 2 find the value of 7 12 from the roof slope multiplier table which is 1 16.

Measure from the roof. Another method to find the roof pitch is to go into the attic and measure the rise. 2280 1900 380 feet added for pitch. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps.

Step by step example using the roof pitch multiplier table measure the area covered by the roof. How to calculate the pitch of a roof method one. Take your area result and multiply it by the pitch multiplier or slope correction factor found in the table above to arrive at the roof s surface area. 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.

Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. Step 1 multiply 20 and 40 which equals 800. So the actual roof surface if it were laid down flat on the ground would be 1 118 times larger than the footprint of the roof. Measure from the attic.

And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. The maths behind this number is that it is the square root of rise run 2 1. Now you re ready to price out the materials. Roof is 6 12 pitch and measures at 2 400 square feet so 2400 x 1 12 2 688 2 88 sqs added for pitch.

For this example let s assume your roof covers an area that is 20 feet wide and. That gives you 5 590 square feet which is the actual area of the surface of the roof. Calculate the slope of the roof.