Understanding Asphalt Shingles Composition and Manufacturing

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Posted Nov 4, 2024

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Photo of a House Exterior
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Asphalt shingles are a common roofing material used in residential and commercial buildings. They are made from a combination of natural and synthetic materials.

The base material of asphalt shingles is fiberglass, a type of glass fiber that provides strength and durability. This is often blended with other materials like polyester or polypropylene.

Asphalt shingles also contain a layer of asphalt, which is a sticky, black substance derived from petroleum. This asphalt layer helps to bind the shingle together and provides weather resistance.

The asphalt layer is typically coated with a layer of ceramic granules, which are small, hard particles made from crushed stone or glass. These granules help to reflect the sun's rays and prevent the asphalt from becoming too hot.

The combination of fiberglass, asphalt, and ceramic granules makes asphalt shingles a durable and long-lasting roofing material.

What Asphalt Shingles Are Made Of

Asphalt shingles are made of a combination of carefully chosen materials to provide durability, protection, and aesthetic appeal. The quality and composition of your roofing shingles are important for the overall performance and durability of your roof.

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A fiberglass mat is a key component of asphalt shingles, providing a strong and stable base for the rest of the material. Asphalt shingles are made of a combination of materials, including asphalt, granules, sealants, and adhesives.

Mineral-fortified asphalt, reflective granules, and algae-resistant granules all contribute to the performance and longevity of asphalt shingles. These materials work together to create a roofing material that is cost-effective and meets industry standards for performance and longevity.

The composition of shingles can impact various factors, such as fire resistance, weather resistance, and energy efficiency. Understanding the composition of roofing shingles allows homeowners and roofing contractors to make informed decisions when selecting the right shingles for their roofs.

Components and Materials

Asphalt shingles are made from a composite product that includes a fiberglass mat, asphalt, and granules. This composite material is designed to be durable, flexible, and waterproof.

The fiberglass mat provides the reinforcement that helps resist splitting, tearing, and pulling over fasteners. A small difference in mat thickness can make a big difference in shingle tear strength.

Fiberglass shingles are more resistant to heat and humidity than organic shingles, which is important for warm or damp climates. They deform less as they age, making them more stable.

Granules

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Granules are the first line of defense against the elements, a shield that blocks UV rays and provides texture to prevent shingle surface wear. Granules are crafted from crushed natural stone and are meticulously chosen for their durability and colorfastness.

Granules come in a variety of colors, achieved through ceramic firing. Some shingles feature algae-resistant granules that help inhibit discoloration caused by blue-green algae. Close-up of ceramic granules, a critical part of what shingles are made of.

The granules on a shingle's surface are applied in their natural stone-colored state, while the exposed part of the shingle is processed into a variety of colors. Some shingles feature special "reflective" granules that can reflect a higher percentage of the sun's heat energy.

These reflective granules are required by code in certain regions. Fiberglass shingles, which are made with a base layer of glass fiber reinforcing mat, can also be made with reflective granules to enhance their energy efficiency.

Sealant and Laminating Adhesives

Red Coupe Drifting on Asphalt Road
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Sealant and Laminating Adhesives play a crucial role in the manufacturing process of roofing shingles. Thermally-activated asphalt sealants are used to bond shingles together, applied on either the top or bottom surface depending on the shingle design.

These sealants are designed to activate at specific temperature ranges and maintain their bond throughout various weather conditions. They're essential for ensuring the shingles remain secure and durable.

In multi-layer laminated shingles, a substance called laminant is used to attach the layers of shingles together. Laminant is a specially engineered material that activates at the right temperature ranges.

Backsurfacing is a material used to cover the bottom side of the shingle to prevent it from sticking to the process rolls during manufacturing. It's often made from a fine mineral powder, such as limestone-type rock or fine sand.

Types of Asphalt Shingles

Asphalt shingles are made from two main types of base materials: organic and fiberglass. Both types are made in a similar way, with an asphalt-saturated base covered on one or both sides with asphalt or modified-asphalt.

Credit: youtube.com, Asphalt Shingles - Types, Lifespan, and Cost

The top surface granules block ultra-violet light, which causes the shingles to deteriorate, and provide some physical protection of the asphalt core. They also provide color, with lighter shades preferred for their heat reflectivity in sunny climates and darker shades in cooler ones for their absorption.

Some shingles have copper or other biocides added to the surface to help prevent algae growth. Self-sealing strips are standard on the underside of shingles to provide resistance to lifting in high winds.

American Society of Civil Engineers ASTM D7158 is the standard most United States residential building codes use as their wind resistance standard for most discontinuous, steep-slope roof coverings, including asphalt shingles.

Shingle Comparison

Asphalt shingles are a type of architectural shingle, which is designed to create a multidimensional appearance.

There are different types of materials that architectural shingles can be made from, including asphalt and metal.

Architectural shingles may be manufactured from one of a variety of materials, but they all aim to create a unique appearance.

For instance, asphalt shingles are a common material used to make architectural shingles, but metal shingles are also an option.

Ultimately, the choice of material will depend on your specific needs and preferences.

Frequently Asked Questions

Are all asphalt shingles fiberglass?

No, not all asphalt shingles are fiberglass - they also come in an organic mat variety. However, fiberglass shingles are the more common and lighter option.

Did asphalt shingles have asbestos?

Yes, some asphalt shingles contained asbestos, particularly those made before the 1980s. Asbestos was often added to make them more colorful and appealing.

Amy Martin

Senior Writer

Amy Martin is a seasoned writer with over a decade of experience in various industries. She has a passion for creativity and enjoys exploring different perspectives on life. Amy's work often inspires readers to think outside the box and embrace new ideas.

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