The hardest part is how you determine the number of bundles it requires you to order to cover all your roof areas.
How many squares of shingles for my roof.
Singles are often sold in bundles with three bundles equaling one roof square.
Each plywood sheet is 4 x 8 feet or 32 square feet which coincidentally is almost exactly equivalent to the coverage of one bundle of traditional three tab shingles.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.
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 shingles are packaged in a way that they are light enough for the average person to carry around.
It is common to use 3 bundles to a square of shingles.
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.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
In other words if you buy 3 bundles of shingles this will cover one square which is 100 sq ft of area.
Asphalt shingles range in price from about 25 per bundle for a standard 3 tab style to around 50 75 or more for an upgraded architectural style.
When you are using 3 bundles for a square you will be getting 29 standard shingles in each bundle.