what are the exterior house shingles that may contain asbestos

What Are the Exterior House Shingles That May Contain Asbestos?

Introduction

When it comes to renovating or maintaining your house, understanding the materials used in its construction is crucial. One of the areas that often goes overlooked is the exterior shingles of your home. Many older houses were constructed using shingles that contained asbestos, a harmful mineral known for its heat resistance and durability. Asbestos was commonly used in construction materials until its health hazards were discovered, leading to its ban in many countries. In this article, we will delve into the various types of exterior house shingles that may contain asbestos, helping you identify potential risks and ensure the safety of your living environment.

The Historical Use of Asbestos in Exterior House Shingles

Asbestos, due to its fire-resistant properties, was heavily used in building materials throughout the 20th century. This includes a wide range of products, such as insulation, cement, adhesive, and exterior shingles. Siding shingles made from asbestos cement were popular due to their strength, resistance to weather conditions, and low maintenance requirements. Asbestos-containing shingles were commonly used from the 1920s to the late 1980s when the health risks associated with asbestos became well-known.

The Different Types of Exterior House Shingles That May Contain Asbestos

1. Asphalt Shingles

Asphalt shingles were first used in the early 1900s and gained popularity due to their affordability and durability. These shingles consist of a fiberglass or organic base that is saturated with asphalt and then coated with mineral granules. While modern asphalt shingles no longer contain asbestos, older versions produced before the 1980s might include asbestos fibers. Therefore, it is important to exercise caution if you have an older house or are considering purchasing one with asphalt shingles that are over a few decades old.

Asphalt shingles are relatively easy to identify, as they resemble small rectangles with a layered appearance. To determine if they contain asbestos, it is recommended to consult a professional asbestos inspector who can perform a thorough analysis to ensure accurate identification.

2. Cementitious Shingles

Cementitious shingles, also known as fiber cement or fiber shingles, were widely used as exterior house shingles. These shingles contained a combination of cement, cellulose fibers, and asbestos fibers. The asbestos fibers added strength and durability to the shingles, making them resistant to harsh weather conditions.

Identifying cementitious shingles that contain asbestos can be challenging since they often appear very similar to non-asbestos versions. It is advisable to consult an asbestos professional who can collect a sample and have it tested in a laboratory to confirm the presence of asbestos.

3. Wood Shingles

Wood shingles have been used for centuries to protect houses from the elements. However, in the early 20th century, some manufacturers used asbestos fibers to reinforce wood shingles, resulting in increased strength and fire resistance. These asbestos-containing wood shingles are typically referred to as 'transite' shingles.

To determine if your wood shingles contain asbestos, it is best to consult an expert who can inspect and test them properly. It is important not to disturb or remove potential asbestos-containing shingles without professional guidance, as it may release dangerous asbestos fibers into the air.

4. Synthetic Shingles

Synthetic shingles, such as those made from fiberglass or plastic polymers, are newer materials not typically associated with asbestos. These shingles are often used as alternatives to traditional materials like wood or asphalt. Although synthetic shingles are unlikely to contain asbestos, it is still important to verify this with professional assistance, especially if the shingles are more than a few decades old.

While synthetic shingles offer benefits such as durability, resistance to weather, and low maintenance, it is recommended to consult an expert to ensure their composition is asbestos-free.

5. Slate and Tile Shingles

Slate and tile shingles are known for their classic and elegant appearance. These shingles, most commonly made from natural materials like slate, clay, or ceramic, are generally not associated with asbestos. Their composition significantly reduces the risk of asbestos exposure.

However, it is important to remain cautious when dealing with older houses or those built before the 1980s. In some cases, manufacturers added asbestos to slate or tile shingles to enhance their durability. To properly identify potential asbestos-containing slate or tile shingles, consulting an expert is crucial for accurate testing and analysis.

Conclusion

If you own an older home or are considering purchasing one, it is essential to be aware of the materials used in its construction, particularly the exterior shingles. While many asbestos-containing products have been phased out, it is still crucial to exercise caution when dealing with older construction materials. Various types of exterior house shingles, including asphalt, cementitious, wood, synthetic, and slate or tile shingles, may have contained asbestos in the past.

To ensure the safety and wellbeing of yourself and your family, consulting with an asbestos professional is highly recommended. These professionals possess the expertise and specialized testing tools required to accurately identify the presence of asbestos in exterior house shingles. By being proactive and informed, you can mitigate potential risks and create a safe living environment for you and your loved ones.