Just those two examples give you a range of from 1 3 times footprint square footage to almost 2 times for a one story house.
Square footage of a roof square.
Take away overhangs and of course the ratio can go as low as 1 0.
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Change the 2000sf dimensions to 45x44 4 feet with ridge along the 45 dimension you get 51x50 4 roof plan footage 2570 sf flat or 3635 at 12 12 slope.
Include dormers the small outjuttings over attic.
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.
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1 roofing square 100 square feet.
10 feet x 10 feet 100 square feet or 1 roofing square 5 feet x 20 feet 100 square feet or 1 roofing square.
This means you would need 240 squares of shingles to cover that roof.
Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
The calculator cannot account for complex shapes based on a measurement of square footage alone.
To determine the number of squares on the gable roof example in this post divide its total of 24 000 square feet by 100 24 000 100 240.
Steps to measuring roof square footage prepare.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
How to calculate square feet of a roof step 1.
Get the square footage of roof and divide it by 100 and it will give the number of squares you need and for every decimal number over 3 buy a bundle to achieve the amount of material.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100.
Multiply the length and width of each square or rectangle shaped plane.
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.
It does not matter how you arrive at 100 square feet.
A roofing square is equal to 100 square feet of the roof.
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A square is an area of roof which measures 100 square feet.
The result is 240 and this means you would need 240 squares of shingles to cover that roof.
Calculate each plane separately.
Measure the length and width of every roof plane or surface.
The answer is the number of roofing squares for the roof.
Use a tape measure to note the length and width of your roof including dormers.