Asphalt shingles are a popular choice for roofing in Huntsville AL, known for their durability and aesthetic appeal. A key component of these shingles is the granules that coat their surface. Understanding the role of these granules is crucial for homeowners and roofing contractors in Huntsville AL alike.
Composition of Asphalt Shingle Granules
Asphalt shingle granules are typically made from crushed rock, finely sifted to achieve a specific grain size. This base material is then combined with ceramic granules, creating a robust and weather-resistant outer layer. The granule mix may include additional elements for enhanced functionality. For instance, copper granules can be incorporated to provide resistance against blue-green algae, a common issue in humid climates.
Manufacturing Process of Asphalt Shingles
The journey of an asphalt shingle begins with wide sheets of fiberglass, which are soaked in hot asphalt. This process is repeated to ensure thorough coating. After the second soaking, the sheets are coated with powdered limestone to improve flexibility. The granule mixture is then pressed onto one side of these sheets while they are still wet. Advanced Roofing & Construction, LLC, as a leading roofing company in Huntsville AL, emphasizes the importance of this step in ensuring the longevity and effectiveness of the shingles.
The Protective Function of Granules
The primary role of these granules is to shield the underlying asphalt layer from UV damage. Prolonged exposure to sunlight can cause the asphalt to crack or split, significantly reducing the lifespan of the roof. The granules provide an opaque barrier, protecting the asphalt and extending the roof’s service life.
Signs of Granule Erosion and Roof Aging
Over time, the granules on asphalt shingles can erode due to weather exposure. This erosion is a key indicator of an aging roof, often visible as “balding” patches where the darker asphalt layer becomes exposed. While most roofs come with warranties against premature wear, Advanced Roofing & Construction, LLC advises that if a roof is beyond its expected lifespan, it may be more practical to replace it rather than repair it.
Conclusion
The granules on asphalt shingles play a vital role in protecting and prolonging the life of a roof. Their composition, manufacturing process, and protective function are essential considerations for any homeowner or roofing contractor. Understanding these aspects can help ensure the longevity and effectiveness of roofing in Huntsville AL.