Convert the area to roofing squares.
How to measure square footage of a flat roof.
Because each 100 square feet of roof is one.
The length l times the height h of a triangle is twice its area a2.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
Multiply the length and width of each square or rectangle shaped plane.
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.
This is simply 100 square feet of roof.
Measure the length and width of every roof plane or surface.
How to calculate square feet of a roof.
Simply input the surface area of the roof choose from one of the available options and you will get your first roofing estimate.
First use your measuring tape to measure 12 inches on your large level and make a mark at the 12 inch line.
Next you will need to use a roofing materials calculator.
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.
So if you divide your answer of a product of length times height by two you will get the area of a triangle.
1 roof square 100 square feet.
If the house has an irregular shape measure each part separately figure the separate areas and add them together.
How to calculate your roof square footage first measure the length and width of each surface on the roof then multiply these values to get the square footage of that surface.
Flat roofs 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.
To find the squares divide the overall roof area by 100 and then round up.
After that place your level against the gable trim and flat against the side of the house.
Include dormers the small outjuttings over attic windows.
A square simply refers to a 10 x 10 square of roofing.
Climb to the top of your roof.
Check that your footage measurements are within this range so you can start off on the right foot.
Make sure to document the number of chimneys skylights or other obstructions and include dormers in your measurements.
L h 2 area calculating an area of a triangle when estimating a roof.
