What is the recommended percentage for waste calculation when applying asphalt shingles?

The recommended percentage for waste calculation when applying asphalt shingles is typically around 10%. This estimate takes into account various factors that can lead to waste during the installation process, such as cutting shingles to fit around corners, valleys, and vent pipes, as well as the potential for mistakes or damages that may occur while handling and installing the materials.

Using this 10% waste factor allows for a more accurate and sufficient purchase of materials, ensuring that the roofing project goes smoothly without running short. This percentage is considered a standard in the industry and is widely used by contractors to minimize the risk of insufficient materials during installation. It's important to remember that different roofing styles or complex roof designs may require adjustments to this percentage, but for most straightforward applications of asphalt shingles, 10% is the widely accepted norm.