Illinois Roofing Practice Exam

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Which of these is the most important performance characteristic for granules on asphalt shingles?

Their color variation.
Their size uniformity.
To protect the coating-grade asphalt surface.
Their reflective properties.

The correct answer is: To protect the coating-grade asphalt surface.

The most important performance characteristic for granules on asphalt shingles is that they protect the coating-grade asphalt surface. Granules serve a crucial role in safeguarding the underlying asphalt from harmful ultraviolet (UV) rays, which can cause significant deterioration over time. By providing this protective layer, granules not only extend the life of the shingles but also contribute to maintaining their overall integrity and appearance. While factors like color variation, size uniformity, and reflective properties are important for aesthetic and functional reasons, they do not overshadow the primary role of granules in protecting the asphalt beneath. The roofing system's durability and longevity hinge on this protective function, making it the most critical aspect of granule performance.