The Dark Side of Coal Tar Sealcoat: Why It's Falling Out of Favor

The Dark Side of Coal Tar Sealcoat: Why It's Falling Out of Favor

For decades, coal tar sealcoat was a popular choice for protecting asphalt surfaces. Its deep black color and perceived durability made it a go-to for parking lots and driveways. However, mounting evidence has revealed a dark side to this product, leading to increasing restrictions and bans. Let's explore why coal tar sealcoat is falling out of favor.

The Problem: Polycyclic Aromatic Hydrocarbons (PAHs)

The primary culprit behind coal tar's negative reputation is its high concentration of polycyclic aromatic hydrocarbons (PAHs). These are a group of chemicals that are:

• Carcinogenic: PAHs are known to cause cancer in humans and animals.

• Toxic: They can contaminate soil and water, posing risks to aquatic life and ecosystems.

• Persistent: PAHs break down slowly in the environment, accumulating over time.

How Coal Tar Sealcoat Releases PAHs:

• Wear and Tear: As coal tar sealcoat breaks down, it releases PAH-laden dust and particles.

• Runoff: Rain and snow can wash PAHs into waterways, contaminating them.

• Volatilization: PAHs can evaporate into the air, contributing to air pollution.

The Environmental and Health Impacts:

• Water Contamination: Studies have shown that runoff from coal tar-sealed surfaces significantly increases PAH levels in nearby streams and lakes.

• Soil Contamination: PAH dust can settle on soil, contaminating it and potentially entering the food chain.

• Human Health Risks: Exposure to PAHs, particularly through inhalation of dust or ingestion of contaminated water, increases the risk of cancer and other health problems.

• Aquatic Life: PAHs are toxic to aquatic organisms, harming fish and other aquatic life.

Why Coal Tar is Being Banned:

Due to the serious environmental and health risks, many jurisdictions have implemented bans or restrictions on the use of coal tar sealcoat. These bans are based on scientific evidence demonstrating the harmful effects of PAHs.

Alternatives to Coal Tar Sealcoat:

Fortunately, safer and more environmentally friendly alternatives are available:

• Asphalt-Based Sealcoats (AE Sealcoats): These sealcoats are made from asphalt emulsion, which contains significantly lower levels of PAHs.

• Bio-Based Sealcoats: These sealcoats are made from renewable resources, such as soybean oil or other plant-based materials.

Making the Switch:

Choosing a coal tar alternative is not only better for the environment and public health, but it also demonstrates a commitment to responsible practices. While coal tar may have been a common practice in the past, the overwhelming evidence shows that its detrimental effects outweigh any perceived benefits. By choosing an alternative, you are choosing a safer and more sustainable future.

At B2B Sealcoating, we only use AE Sealcoat. Not only is this safer for us, safer for you, and safer for your home, it's the proper thing to do for the environment. Give us a call at 715-760-3112 or email us at info@b2bsealcoat.com and let's get you a free estimate today.