As an example if your overhang is 12 inches you ll add 2 feet to the overall length and 2 feet to the overall width of the house.
How to measure sq feet of roof.
Multiply the length and width of each square or rectangle shaped plane.
If the house has an irregular shape measure each part separately figure the separate areas and add them together.
Convert the area to roofing squares.
Next you will need to use a roofing materials calculator.
Measure the length and width of every roof plane or surface.
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.
Simply input the surface area of the roof choose from one of the available options and you will get your first roofing estimate.
How to calculate square feet of a roof step 1.
This nominal square footage amount is then multiplied by a factor associated with the roof s pitch.
Check that your footage measurements are within this range so you can start off on the right foot.
Because each 100 square feet of roof is one.
Calculate each plane separately.
Include dormers the small outjuttings over attic.
Roof pitches in degrees.
Measure your house at ground level then add in the roof s overhang for greater accuracy.