How Big is a Roofing Square?

Last Updated on: 13th January 2023, 10:45 pm

Last Updated on by Viliam

Roof square size

In roofing, one of the most necessary measurements is the size of a roofing square. The area covered by a roofing square is 100 square feet. That means that the square of shingles will cover 100 square feet of your roof. For a project that requires 1200 square feet of roofing material, you´ll need 12 roof squares. The area of a 40 square roof is 4000 square feet.

Knowing how to calculate roof squares will help you calculate the amount of material you need for your project.

How many bundles in a square and how many shingles?

How many bundles of shingles do you need to cover one square? To order the right amount of shingles, you have to measure accurately. 

Typically, three bundles of shingles cover one roof square. Standard shingles are 12 x 36 inches and come in packages of 29. One bundle covers about 33.3 square feet, so three bundles should cover 100 square feet.

In the same way, we can calculate how many shingles are needed per square. Three bundles of 29 shingles each make 87 shingles per square.

However, the exact number wil depend on the type and size of shingles you choose. For an accurate estimate, it´s best to talk to an experienced contractor or roofer.

Roofing per square cost

Roofing costs per square vary greatly depending on the type of roof you are building, its pitch, shape, complexity, and the material used. Asphalt shingles are generally the most affordable option, costing between $100 and $250 per square. Metal roofs tend to be more expensive, ranging from $200 to $500 per square. Slate roofs, which are considered the highest rank material, can cost up to $1,000 or more per square.

When considering the cost of a roof replacement, it´s wise to factor in labor costs as wel. Labor costs can range from $2 to $4 per square foot ($200 – $400 per square) for asphalt shingle roofing, and up to $7 per square foot for slate roofs ($700 per sqaure).

Ultimately, the cost of froof replacement wil depend on the size of your roof, the materails you choose, and the contractor you hire. Be sure to get multiple estimates from different contractors before making your decision.