When it comes to roofing projects, understanding the terminology and measurements is crucial for both contractors and homeowners. One of the most frequently asked questions in roofing is: how many squares of shingles are in a bundle? This article will provide an in-depth explanation of roofing squares and bundles, and how to calculate the number of bundles needed for your roofing project.
Understanding Roofing Terminology
What Is a Roofing Square?
A roofing square is a standard unit of measurement in the roofing industry. One roofing square is equivalent to 100 square feet of roof area. This term simplifies the process of estimating roofing materials, labor, and costs. For example, if a roof is 2,000 square feet, it would be referred to as 20 squares.
What Is a Shingle Bundle?
Shingles are typically packaged in bundles for ease of handling and transportation. A bundle of shingles is a set number of shingles wrapped together and sold as a unit. The number of shingles in a bundle can vary based on the type and manufacturer. Generally, shingles are packaged so that three bundles cover one roofing square.
Types of Shingles
Asphalt Shingles
Asphalt shingles are the most common type of roofing material in North America due to their affordability and durability. They come in three main types:
- 3-Tab Shingles: These are the most basic and economical option. They are flat, with a uniform appearance and typically require three bundles to cover one square.
- Architectural Shingles: Also known as dimensional shingles, they are thicker and provide a more textured appearance. These shingles also generally require three bundles per square.
- Luxury Shingles: These are high-end shingles that mimic the appearance of natural materials like slate or wood. The coverage per bundle can vary, but typically still follows the three bundles per square standard.
Wood Shingles and Shakes
Wood shingles and shakes are made from cedar or other types of wood. They offer a natural and rustic appearance. The coverage per bundle can vary more significantly with wood shingles, often requiring more than three bundles to cover a square due to their varying sizes and thicknesses.
Other Roofing Materials
Other materials such as metal, slate, and tile shingles do not follow the same bundling system as asphalt shingles. These materials are often sold by the square or in individual pieces.
Calculating the Number of Bundles Needed
Measuring Your Roof
To estimate the number of bundles you need, you must first determine the total square footage of your roof. Here’s a step-by-step guide:
- Measure the Length and Width: Measure the length and width of each section of your roof. For multi-section roofs, calculate the area of each section separately.
- Calculate the Area: Multiply the length by the width to get the square footage of each section.
- Total Area: Add the square footage of all sections to get the total roof area.
For example, if your roof has two sections, one measuring 20 feet by 25 feet and the other 15 feet by 30 feet:
- Section 1: 20 feet x 25 feet = 500 square feet
- Section 2: 15 feet x 30 feet = 450 square feet
- Total Area: 500 + 450 = 950 square feet
Convert to Roofing Squares
Convert the total square footage to roofing squares by dividing by 100. Using the example above:
- 950 square feet ÷ 100 = 9.5 squares
Determine the Number of Bundles
Since three bundles of asphalt shingles typically cover one square, multiply the number of squares by three:
- 9.5 squares x 3 bundles per square = 28.5 bundles
Since you cannot purchase half a bundle, you would round up to 29 bundles.
Factors Influencing the Number of Bundles
Waste Factor
It’s important to account for waste when calculating the number of bundles. Roofing projects often result in waste due to cuts, overlaps, and mistakes. Adding an extra 10% to 15% to your total can help cover these losses. For our example:
- 28.5 bundles x 1.10 (10% waste factor) = 31.35 bundles, rounded up to 32 bundles
Roof Complexity
The complexity of the roof can affect the number of bundles needed. Roofs with multiple peaks, valleys, dormers, and other features require more cutting and fitting, leading to more waste. Adjusting the waste factor accordingly can help ensure you have enough shingles.
Shingle Type and Manufacturer
As mentioned earlier, the number of shingles per bundle can vary depending on the type and manufacturer. Always check the packaging for the exact coverage details. Some architectural shingles may cover slightly less than three bundles per square, while some premium or luxury shingles may vary even more.
Ordering Shingles
Consult with Suppliers
When ordering shingles, it’s wise to consult with your supplier or contractor. They can provide valuable insights based on your specific project and ensure you order the correct amount.
Return Policies
Check the return policies of your supplier. Many suppliers allow returns of unopened bundles, so it’s better to order slightly more than to run short and face delays.
