In other words if you buy 3 bundles of shingles this will cover one square which is 100 sq ft of area.
How many square of shingles for 24x48 roof.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
Your roofer will know that steeper roofs use more shingles than lower sloped roofs for the same house size and there are established slope multiplier factors to make this calculation simple see table below.
To properly calculate how many bundles of shingles are needed to roof.
The most usual case when buying standard shingles i e three tab strip shingles and laminated shingles there are 29 standard sized shingles 12 in.
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.
However shingles are packaged in a way that they are light enough for the average person to carry around.
The most common type of shingle called a three tab or strip shingle is generally packaged three bundles per square.
To find the amount of shingles you will need multiply the number of squares by three.
It is common to use 3 bundles to a square of shingles.
Each square will need three bundles of shingles to cover it.
The most common is to have three bundles of shingles for a square of roof area.
How many bundles of shingles will you need the average bundle of shingles covers 33 3 ft 2 so three bundles of shingles are needed per square.
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.
When you are using 3 bundles for a square you will be getting 29 standard shingles in each bundle.
For example a very steep roof on a 1 000 square foot attic will need more shingles than a lower sloped roof on the same sized attic.
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.
Although roofing projects are estimated and sold by the square roofing material is often not sold in 1 square increments.
By 36 in in each bundle.
So in the gable roof example above you would need 240 squares of underlayment.
Singles are often sold in bundles with three bundles equaling one roof square.
1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.