As a general rule your roof needs 1 square foot of vent area for every 150 square feet of attic space.
How many squares does my roof have.
Singles are often sold in bundles with three bundles equaling one roof square.
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.
Check that your footage measurements are within this range so you can start off on the right foot.
A square simply refers to a 10 x 10 square of roofing.
How to estimate roofing materials.
A square is an area of roof which measures 100 square feet.
Although ceramic tile roofs are expensive they can have a life span of over 100 years.
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.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
The most common type of shingle called a three tab or strip shingle is generally packaged three bundles per square.
Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.
Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
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.
However shingles are packaged in a way that they are light enough for the average person to carry around.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
The answer is the number of roofing squares for the roof.
For a new roof you will also need the same amount of underlayment.
Thus if your attic is 450 square feet you need roof vents equaling 3 square feet.
Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years.
To determine the number of squares on the gable roof above simply divide its total of 24 000 square feet by 100.
To find the squares divide the overall roof area by 100 and then round up.
The result is 240 and this means you would need 240 squares of shingles to cover that roof.
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.
It is often compared to slope but is not exactly the same.
This is simply 100 square feet of roof.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
For instance if the roof is 1550 square feet then it is 16 squares.
