How Many Feet are in a Square of Shingles?
Knowing how many square feet are in a square of shingles is crucial for any roofing project, whether you're a DIY enthusiast or a seasoned professional. This seemingly simple question often trips up even experienced contractors, so let's clarify once and for all.
Understanding "A Square" in Roofing
In the roofing industry, a "square" doesn't refer to a geometric shape. Instead, it's a unit of measurement representing 100 square feet. This is the standard unit used to determine the amount of roofing materials needed for a project.
So, the answer to the question "How many feet in a square of shingles?" is 100 square feet.
Calculating Your Shingle Needs
While knowing that a square equals 100 square feet is fundamental, accurately calculating your shingle needs requires more than just this single piece of information. Here's a breakdown of the process:
1. Measure Your Roof: Carefully measure the length and width of each section of your roof. Remember to account for any valleys, hips, or ridges which may require extra shingles. For complex roof shapes, it's often advisable to consult with a roofing professional.
2. Calculate the Area: Multiply the length and width of each section of your roof to determine the area in square feet. Add up the areas of all sections to get the total square footage.
3. Account for Waste: Shingles inevitably incur some waste during installation. Factor in a waste allowance of 5-10%, depending on the complexity of your roof and your experience level. More complex roofs or less experienced installers will generally require a higher waste allowance.
4. Determine the Number of Squares: Divide your total square footage (including waste allowance) by 100 to determine the number of squares of shingles needed for your project.
Example:
Let's say you have a roof with a total area of 1200 square feet. Adding a 10% waste allowance (1200 * 0.10 = 120 square feet), your total needed square footage becomes 1320 square feet. Dividing this by 100 (1320 / 100 = 13.2), you'll need approximately 14 squares of shingles to complete your roofing project (always round up to the nearest whole square).
Beyond the Square: Other Factors to Consider
While the number of squares is the primary metric, other factors influence your shingle purchase:
- Shingle Size and Type: Different shingle types and sizes may have varying coverage per square. Always check the manufacturer's specifications for accurate coverage information.
- Underlayment: Don't forget to factor in the square footage needed for underlayment, a crucial waterproofing layer beneath the shingles.
- Flashing: Flashing materials are essential around chimneys, vents, and other roof penetrations.
By carefully considering these factors and understanding the basic concept of a "square," you can confidently estimate your shingle needs for a successful roofing project. Remember, if you're unsure about any aspect of the process, consulting a qualified roofing professional is always the best course of action.
