The slope of the roof provides the rise and the run to be plugged into the equation.
Roof square footage multiplier.
So 2400 x 1 12 2 688 2 88 sqs added for pitch.
And that s the number you were looking for.
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 1 multiply 20 and 40 which equals 800.
So continuing our example if you ve got a two story house with a total square footage of 2 700 square feet with each floor having.
In cases where a roof has a complex shape such as in the image to the right measuring the dimensions and areas of each part of the roof to calculate total area will result in a more accurate measurement of area.
And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier.
If your roof measures 48 feet 15 m x 24 feet 7 3 m multiplying its length by its width would give you a square footage of 1 152 square feet 107 0 m 2.
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.
Step 2 find the value of 7 12 from the roof slope multiplier table which is 1 16.
2280 1900 380 feet added for pitch.
The calculator cannot account for complex shapes based on a measurement of square footage alone.
Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area.
1900 x 1 2 2280.
The pitch of the roof is the rise over a 12 inch run.
Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10.
For example a 4 12 pitch roof that is 100 square feet.
If your roof is flat or has no more than a 3 in 12 pitch you can calculate its total square footage by simply multiplying the length by the width.
That gives you 5 590 square feet which is the actual area of the surface of the roof.
Roof is 6 12 pitch and measures at 2 400 square feet.
Divide the rise by the run the run is 12.
Roof pitch area multipliers.
Find the square root of the result.
100 1 054 105 4ft 2.
Use our roof pitch calculator to find the pitch of your roof.
If its pitch is 6 in 12 a pitch multiplier of 1 12 multiplying 1 152 sq ft 107 0 m 2 by 1 12 would give you an overall square footage of 1 290 square feet 120 m 2.
A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118.
