Roof Multiplier For Pitch

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.

Roof multiplier 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. 2280 1900 380 feet added for pitch. Measure from the attic. Get your roof size by using this roof pitch calculator.

Step 1 multiply 20 and 40 which equals 800. 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. Let s assume the pitch is 8 12. Step 2 find the value of 7 12 from the roof slope multiplier table which is 1 16.

The maths behind this number is that it is the square root of rise run 2 1. And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. 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. Enter your numbers into this go to roof pitch calculator.

That gives you 5 590 square feet which is the actual area of the 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. Measure from the roof. Calculate the slope of the roof.

Now you re ready to price out the materials. 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. How to calculate the pitch of a roof method one. 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.

You might like to use this roof slope calculator. One method to find the pitch is to climb on the roof and measure the rise for a 12. For this example let s assume your roof covers an area that is 20 feet wide and.