Waterproofing for Asphalt Roofs

Waterproofing for Asphalt Roofs

Asphalt roofs are a popular choice for residential and commercial buildings due to their affordability and durability. However, like any other roofing material, they are not completely immune to water damage. Water seepage can lead to costly Repairs and even structural issues if not addressed promptly. Thankfully, there are specialized waterproofing techniques available to protect asphalt roofs and extend their lifespan. In this article, we will explore these techniques in detail, providing you with the knowledge to make informed decisions about waterproofing your asphalt roof.

Waterproofing for Asphalt Roofs
Waterproofing for Asphalt Roofs 1

What is Waterproofing?

Waterproofing is the process of making a surface or structure impervious to water. In the context of asphalt roofs, waterproofing involves applying materials and coatings that create a barrier between the roof and water, preventing leaks and water damage.

Why is Waterproofing Important for Asphalt Roofs?

Asphalt roofs, despite their strength, can deteriorate over time due to exposure to harsh weather elements, including rain, snow, and hail. This deterioration can lead to cracks and gaps that allow water to penetrate the roof, potentially damaging the underlying structure. Waterproofing your asphalt roof helps to prevent water infiltration, preserving its integrity and increasing its lifespan.

Specialized Waterproofing Techniques for Asphalt Roofs

  1. Seal Coating: Seal coating is a common technique used to waterproof asphalt roofs. It involves applying a protective layer of sealant over the surface of the roof. This sealant acts as a barrier, preventing water from seeping into the asphalt shingles. Seal coating also helps to protect the roof from UV rays and other environmental factors that can cause premature aging.

  2. Membrane Roofing: Membrane roofing involves the installation of a waterproof membrane over the asphalt roof. The membrane is made of synthetic materials such as PVC or TPO, which are highly resistant to water and provide excellent protection against leaks. Membrane roofing is particularly effective for flat roofs, as it offers a seamless and durable solution.

  3. Liquid Applied Waterproofing: Liquid applied waterproofing involves the use of liquid membranes that are applied directly to the asphalt roof surface. These liquid membranes can be made from various materials, such as asphalt, polyurethane, or acrylic. They create a waterproof barrier that adheres to the surface of the roof, preventing water infiltration.

  4. Reinforced Waterproofing: Reinforced waterproofing involves the use of reinforcing materials, such as geotextiles or fiberglass, in conjunction with liquid applied waterproofing systems. These reinforcement materials enhance the strength and durability of the waterproofing system, making it more resistant to cracking and tearing.

  5. Flashing: Proper installation of flashing is crucial for preventing water leaks in areas where the roof meets walls, chimneys, or other protrusions. Flashing is typically made of metal and is installed around these vulnerable areas to redirect water away from them and prevent seepage. Regular inspection and maintenance of flashing is essential to ensure its effectiveness.

FAQ about Asphalt Roof Waterproofing

Q: How often should asphalt roofs be waterproofed?
A: The frequency of waterproofing depends on various factors, including the age, condition, and climate of the roof. Generally, it is recommended to waterproof asphalt roofs every 5-10 years or as needed.

Q: Can I waterproof my asphalt roof myself?
A: While some waterproofing techniques, such as seal coating, can be performed by homeowners with the necessary tools and skills, it is often best to hire a professional roofing Contractor for more complex waterproofing methods like membrane roofing or liquid applied waterproofing.

Q: How long does waterproofing for asphalt roofs last?
A: The longevity of waterproofing for asphalt roofs depends on the specific technique used and factors such as weather conditions and maintenance. On average, quality waterproofing can last between 10-20 years before requiring reapplication.

Q: Are there any environmental considerations with asphalt roof waterproofing?
A: Yes, it is important to consider the environmental impact of the materials used in the waterproofing process. Look for eco-friendly options and consult with professionals who prioritize sustainability.


Protecting your asphalt roof from water damage is essential to ensure its longevity and prevent costly repairs. Specialized waterproofing techniques, such as seal coating, membrane roofing, liquid applied waterproofing, reinforced waterproofing, and proper flashing installation, can effectively safeguard your roof against water infiltration. Remember to consider the specific conditions of your roof, seek professional advice when necessary, and prioritize eco-friendly solutions. By investing in the right waterproofing methods, you can extend the life of your asphalt roof and enjoy peace of mind knowing your property is adequately protected.

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