How Much Roofing Shingles Do I Need?

When roofing a house or any other building, one of the most important factors is the number of roofing shingles needed. Knowing how many shingles you need for your project will help you budget properly and ensure you have enough materials to complete the job. In this article, we’ll discuss the factors that can affect the number of shingles you need and how to calculate the number needed for your project.

Factors Affecting the Amount of Roofing Shingles Needed

The roof size: It is the primary factor determining the number of shingles you need. The larger the roof, the more shingles you’ll need to cover it.

The slope of the roof: The slope will also impact the number of shingles needed. A steeper roof will require more shingles to cover it.

The type of shingles: The type of shingles you choose will also affect the amount needed. Some shingles come in larger sizes than others, so you’ll need fewer to cover the same area.

The method of installation: The installation can also impact the number of shingles needed. Some installation methods may require more or fewer shingles.

Calculating the Amount of Shingles Needed

To calculate the number of shingles needed for your project, you’ll need to follow these steps:

Step 1: Measure the area of the roof

To do this, you’ll need to measure the length and width of each roof section that needs to be covered with shingles. Once you’ve measured the length and width, multiply the length by the width to get the square-foot area. If one section of the roof is 10 feet wide and 20 feet long, the area is 200 square feet (10 x 20 = 200).

Step 2: Determine the pitch of the roof

The pitch refers to the steepness of the roof. You’ll need to know the roof’s pitch to calculate shingles. You can determine the pitch of the roof by measuring the rise and run of the roof. The rise is the height of the roof from the bottom to the peak, and the run is the horizontal distance from the roof’s edge. Once you have these measurements, you can use an online calculator or formula to determine the roof’s pitch.

Step 3: Calculate the shingles needed

Once you know the area of the roof and the pitch, you can use a shingle calculator to determine the number of shingles needed. A shingle calculator will consider the type of shingles you’re using, the size, and the roof’s pitch to determine the number of shingles needed. Most roofing supply stores have shingle calculators available on their websites that you can use for free.

Step 4: Add extra shingles

It’s always a good idea to order extra shingles in case of waste, mistakes, or future repairs. A general rule of thumb is to order an extra 10% to 15% of the needed amount.

Type of Roofing Shingles

Asphalt Shingles

Asphalt shingles are the most popular roofing shingle in the United States. They are made of a fiberglass base mat coated with asphalt and mineral granules. Asphalt shingles are available in various colors and styles. 3-tab shingles are the most affordable and primary option, while architectural shingles are thicker, more durable, and more dimensional.

Metal Shingles

Metal shingles are made of steel, aluminum, or copper and are designed to look like traditional roofing materials, such as wood shakes or slate tiles. They are lightweight, durable, and energy-efficient, lasting up to 50 years or more. Metal shingles are also fire-resistant and can withstand extreme weather conditions, making them an excellent choice for homeowners in areas prone to hurricanes, wildfires, or hailstorms.

Wood Shingles and Shakes

Wood shingles and shakes are made of redwood, cedar, or other wood types. They provide a natural and rustic look to the roof and can last up to 30 years or more with proper maintenance. Wood shingles are thinner and more uniform than wood shakes, which are thicker and more distinctive. 

However, wood shingles and shakes are more susceptible to fire, rot, and insects than other types of shingles and require regular maintenance.

Slate Shingles

Slate shingles are made of natural stone and are among the most expensive and durable roofing materials available. They are heavy and require a substantial roof structure to support them. Slate shingles are available in various colors and textures and can last up to 100 years or more. However, slate shingles are difficult to install and repair and can be brittle and prone to cracking.

Tile Shingles

Tile shingles are made of clay or concrete and are prevalent in Mediterranean or Spanish-style homes. They provide a durable and fire-resistant roofing option that can last up to 50 years or more. Tile shingles are available in various colors, shapes, and styles, including flat, S-shaped, and barrel tiles. However, tile shingles are heavy and require a substantial roof structure to support them, and they can be costly to repair or replace.

Choosing the correct type of roofing shingle for your home is an important decision that should be based on your budget, style preferences, and the climate in your area. Asphalt shingles are the most popular and affordable option, while metal shingles are the most durable and energy-efficient. Wood shingles and shakes provide a rustic and natural look, while slate and tile shingles offer a durable and fire-resistant option. Be sure to consult with a roofing professional to determine the best type of shingle for your home and budget.