Check that your footage measurements are within this range so you can start off on the right foot.
How many squares does my roof have.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.
As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space.
However shingles are packaged in a way that they are light enough for the average person to carry around.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
It is often compared to slope but is not exactly the same.
Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure.
Singles are often sold in bundles with three bundles equaling one roof square.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
They should be divided equally between inlet and outlet vents and they can be used in any combination that will work with your roof s design.
For a new roof you will also need the same amount of underlayment.
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.
A square simply refers to a 10 x 10 square of roofing.
Although roofing projects are estimated and sold by the square roofing material is often not sold in 1 square increments.
The answer is the number of roofing squares for the roof.
This is simply 100 square feet of roof.
How to estimate roofing materials.
Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years.
For instance if the roof is 1550 square feet then it is 16 squares.
To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100.
When figuring the amount of shingles needed to roof a house you first convert the total square footage of the roof to squares a square represents 100 square feet of area covered by shingles.
Estimate the pitch of the roof.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
To find the squares divide the overall roof area by 100 and then round up.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
The result is 240 and this means you would need 240 squares of shingles to cover that roof.
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.
