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.
How many bundles do i need for my roof.
However if you are using heavier shingles you will require 4 to 5 bundles for a square.
For a new roof you will also need the same amount of underlayment.
To estimate roofing materials start by finding the total square footage of the roof and divide the number by 100 to determine the number of squares in the roof.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
It is common to use 3 bundles to a square of shingles.
There are also 29 standard sized shingles measuring 12 inches by 36 inches in each one of these.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
A square represents 100 square feet of area covered by shingles.
Underlayment usually comes in rolls of 4 squares each.
For a new roof you will also need the same amount of underlayment.
So in the gable roof example above you need 240 squares of underlayment.
To properly calculate how many bundles of shingles are needed to roof your home you need to calculate the total square footage of the roof and convert it to squares.
It is often compared to slope but is not exactly the same.
With that as background you are now ready to estimate how many shingles you will purchase for your roof project.
When you are using 3 bundles for a square you will be getting 29 standard shingles in each bundle.
Like most of your neighbors you plan to have the shingles installed by a professional roof.
Singles are often sold in bundles with three bundles equaling one roof square.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every.
The average bundle of shingles covers 33 3 ft 2 so three bundles of shingles are needed per square.
This means you would need 240 squares of shingles to cover that roof.
Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square.
In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.
So in the gable roof example above you would need 240 squares of underlayment.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
Then add 10 to the number to account for waste.
Since transportation is a major cost factor expect prices to vary by location.
