1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
How to determine the square footage of my roof.
For other area shapes see formulas below to calculate area ft 2 square footage.
For example take an area made up of a triangle that s 20 feet high and has a base of 40 feet plus a square that s 40 feet by 40 feet.
The answer is the number of roofing squares for the roof.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
For instance if the roof is 1550 square feet then it is 16 squares.
To find the squares divide the overall roof area by 100 and then round up.
Calculate the area as square footage.
A square simply refers to a 10 x 10 square of roofing.
This is simply 100 square feet of roof.
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.
Convert among square inch square foot square yard and square meter.
Estimate the pitch of the roof.
Length x width area.
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.
How to estimate roofing materials.
Depending whether the roof area is measured horizontally possibly from a drawing or photograph a correction factor is necessary to determine the actual area of the roof.
If you are measuring a square or rectangle area multiply length times width.
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.
Divide any irregularly shaped areas of the roof into more manageable triangles and rectangles then calculate square footage for those individual elements and add them to get the total square footage.
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.
Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.
