Roofing shingles are made in a factory using asphalt, fiberglass, and crushed stones pressed together into flat sheets. According to industry data, about 90% of asphalt shingles made in the U.S. use fiberglass as their base layer. The process starts with laying down a fiberglass mat, then coating it with hot asphalt, and finally sprinkling colored stone granules on top. This mix creates a waterproof barrier that protects your home from rain and sun damage. Shingles come in many colors and styles to match different home designs.
What Is the Base Layer?
The base of most shingles is fiberglass mat. This mat is thin but very strong.
Fiberglass gives shingles their flexibility and durability. It helps shingles bend without cracking when your roof expands and contracts with temperature changes. The mat is layered onto a backing material to create the foundation for the shingle.
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How Is Asphalt Added?
Hot liquid asphalt is poured and spread over the fiberglass mat. According to industry data, roofing shingles are manufactured using petroleum-based asphalt that binds everything together. The asphalt cools and hardens, creating a waterproof seal.
Workers then add a second layer of asphalt on top. This double layer makes shingles extra tough against rain and wind.
Why Add Stone Granules?
Crushed stone granules are sprinkled onto the wet asphalt while it is still hot. These granules stick to the asphalt and serve two purposes. First, they protect the asphalt from sun damage and UV rays. Second, they give shingles their color and texture.
The granules also help shingles reflect heat, which keeps your attic cooler in summer. Different colors of granules create the roof styles you see on homes.
How Long Do Shingles Last?
According to RubyHome (2025), architectural asphalt shingles last about 30 years, while basic asphalt shingles last around 20 years. This means the shingles made today are built to last two to three decades before needing replacement.
The quality of the shingle materials and proper installation affect how long they last. According to industry data, the average age of roofs being replaced is just over 19 years, which means many homeowners get extra life out of their shingles.
| Shingle Type | Lifespan | Cost per Sq. Ft. |
|---|---|---|
| Basic Asphalt | 20 years | $4.25, $4.95 |
| Architectural Asphalt | 30 years | $4.50, $8.25 |
| Metal Roofing | 40, 80 years | $10.00, $17.05 |
According to ARMA 2024, asphalt shingles dominate about 73% of U.S. residential roofing. This shows that the shingle-making process is one of the most common ways to make roofs across America. Manufacturers have perfected this process over many years to create shingles that are affordable, durable, and attractive.
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If you need help with your roof, reach out to a trusted roofing company for clear pricing and reliable service.