Roofing cost per square foot.
Estimate square footage of a roof.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
Multiply the footprint square footage by the multiplier for your roof pitch to find the actual square footage of the roof.
A square simply refers to a 10 x 10 square of roofing.
Simply measure length a x width b.
Multiply the square footage of your roof by 1 to get the 10 percent waste allowance.
When calculating roofing costs per square asphalt shingles run from 350 and 500 per square metal or tin roofs costs 600 to 1 200 per square and concrete or clay costs between 1 200 and 1 800 per square.
For example this shed roof has one roof plane.
Estimate the pitch of the roof.
To conclude the example if your total roofing area is 17 300 square feet your waste allowance would be 17 300 x 1 1 730 square feet.
For instance if the roof is 1550 square feet then it is 16 squares.
Use our roof pitch calculator to find the pitch of your roof.
This is simply 100 square feet of roof.
Although roofing projects are estimated and sold by the square.
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.
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.
How to estimate roofing materials.
Finally calculate your roof s total square footage by simply adding the square footage of each of the planes together.
The total amount of roofing material you need is 17 300 1 730 19 030 square feet.
If you are replacing your current roof add 125 to 500 per roofing square for old roof removal.
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.
This gable roof has two planes.
The first step in a free roofing estimate is measuring the roof dimensions.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
Measure the length and width in feet then multiply together to find the square footage.
You will need to express this size in terms of square feet.
A x b 120 x 100 12 000 sq.
So multiply length a x.
Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
Next find the square footage of the metal roofing panels you want to use.
The answer is the number of roofing squares for the roof.
To find the squares divide the overall roof area by 100 and then round up.
