Another rule of thumb that can give you a ballpark estimate of the roof area on newly built roofs is to look at the number of sheets of plywood used for the roof deck.
How many squares of shingles for my roof.
The hardest part is how you determine the number of bundles it requires you to order to cover all your roof areas.
However if you are using heavier shingles you will require 4 to 5 bundles for a square.
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.
In other words if you buy 3 bundles of shingles this will cover one square which is 100 sq ft of 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.
As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
How many shingles in a square once you have a three bundle pack to cover a square you will have 29 x 12 inches by 36 inch standard sized shingles per bundle.
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.
When you are using 3 bundles for a square you will be getting 29 standard shingles in each bundle.
It is common to use 3 bundles to a square of shingles.
Singles are often sold in bundles with three bundles equaling one roof square.
The most common is to have three bundles of shingles for a square of roof area.