How Long Does a Tar And Gravel Roof Last? (2025)

When you’re managing a commercial property, one crucial decision revolves around the type of roof you install. If you’re considering a tar and gravel roof, you’re likely asking one big question—how long will it last? Properly installed and maintained, this type of roof can offer decades of reliable performance. But its lifespan depends on several factors, including materials, climate, and upkeep. In this blog, we’ll explore:

• What is a tar and gravel roof?
• Factors that impact its lifespan
• Maintenance tips to make your tar and gravel roof last longer

🤔 What is a Tar and Gravel Roof?

A tar and gravel roof is one of the oldest flat roofing systems, known for its durability and affordability. It consists of multiple layers of asphalt (or tar) alternated with supporting materials, topped off with a layer of gravel. This gravel serves two purposes—it protects the tar from UV rays and provides additional weight to help the roof stay secure.

This type of roof is commonly used for flat or low-sloped commercial buildings because it’s cost-effective, easy to install, and offers a long lifespan when properly maintained.

Why Choose a Tar and Gravel Roof?

There’s a reason why this roofing system remains a popular option for commercial properties. Some key advantages include:

• Affordability: Compared to other roofing systems, a tar and gravel roof offers excellent value.
• Durability: The multiple layers provide strong protection against harsh weather conditions.
• UV Resistance: The gravel protects the roof from the sun’s harmful rays, reducing heat absorption and protecting the roof’s lifespan.
• Simplicity: Its construction makes it easy to repair and maintain.

👉 6 Factors That Impact the Lifespan of a Tar and Gravel Roof

While a tar and gravel roof can last 20 to 30 years on average, its lifespan depends on a few factors. These include:

1. Material Quality

The durability and performance of your tar and gravel roof depend heavily on the quality of the materials used during construction. High-grade tar, gravel, and supporting layers are designed to last longer and withstand wear and tear from both weather and time. Cheaper, low-quality materials may save money upfront but often lead to costly repairs or replacements sooner than expected. Investing in premium materials ensures your roof remains functional and reliable for years to come.

2. Climate Conditions

The environment in which your roof exists plays a significant role in its longevity. Extreme weather conditions can accelerate the deterioration of your tar and gravel roof. For instance, continuous exposure to harsh UV rays can break down the tar, making it brittle and reducing its protective properties. Similarly, frequent storms can disrupt the gravel layer, causing gaps that make the roof more vulnerable to water damage. Understanding how the local climate impacts your roof can help you take proactive measures to protect it.

3. Drainage

One of the biggest challenges flat roofs face is proper drainage. Unlike sloped roofs, flat roofs are more prone to water pooling, especially after heavy rain or snowmelt. If water is allowed to sit for extended periods without being drained, it can seep into the roof layers, leading to leaks, mold growth, and even structural damage. Addressing drainage issues promptly with proper design and maintenance, such as ensuring unclogged drains and adding slope adjustments, can prevent standing water from becoming a serious problem.

4. Roof Installation

Even the best materials can’t compensate for a poorly installed roof. Installation errors, such as improper sealing, uneven layering, or inadequate support, can lead to issues that compromise the roof’s performance and lifespan. A professional installation by a qualified contractor is essential to ensure every layer of the roof is correctly placed and built to withstand environmental stressors. Choosing a reputable contractor with experience in tar and gravel roofing can save you from future headaches and costly repairs.

5. Maintenance

Routine maintenance is key to extending the life of your tar and gravel roof. Neglecting regular inspections and upkeep can lead to small issues going unnoticed, which eventually escalate into major problems. Maintenance involves checking for weak spots, repairing damaged areas, and clearing debris to ensure the roof remains in good condition. Staying ahead of potential issues through consistent care can add years to your roof’s lifespan and save you from unexpected expenses down the line.

6. Foot Traffic

Foot traffic is another factor that significantly affects the longevity of your roof. Regular movement on the roof, whether for maintenance, HVAC installations, or other activities, can cause wear and tear on the tar and gravel layers. Heavy foot traffic increases the risk of punctures, cracks, and displacement of gravel, all of which compromise the roof’s integrity. To mitigate this, it’s important to limit unnecessary access to your roof and install protective walkways or mats to minimize the impact of foot traffic. This simple precaution can help preserve the roof’s condition and reduce damage over time.

💡 5 Tips to Make Your Tar and Gravel Roof Last Longer

Keep your roof in top condition with these easy and actionable steps.

Schedule Regular Inspections

Regular inspections are crucial for keeping your flat roof in excellent condition. Aim to check for damage at least twice a year—once in the spring and once in the fall—or after major storms. Look for signs of wear, such as cracks, pooling water, or damaged materials, as these can quickly turn into costly repairs if left unaddressed. Early detection is your best defense against bigger issues.

Address Water Pooling Quickly

Flat roofs are particularly prone to ponding water, which can weaken the roof structure over time and lead to leaks. If you notice water pooling, don’t ignore it. Call a professional roofer to assess and fix any drainage issues before they escalate. Proper drainage systems are key to extending your roof’s lifespan and maintaining its integrity.

Replace Damaged Gravel

Gravel serves as an essential layer of protection for your roof, shielding it from harmful UV rays and potential damage. Over time, gravel can thin out or go missing in certain areas, leaving your roof vulnerable. If you notice bare patches, replace the damaged gravel promptly to ensure your roof stays protected from the elements.

Repair Cracks Promptly

Cracks in the tar or other roofing materials may seem minor, but they can quickly lead to bigger problems, such as leaks or structural damage. As soon as you spot a crack, take action to repair it. Addressing small issues right away prevents them from growing into major repairs that are time-consuming and expensive.

Choose a Maintenance Plan

Investing in a professional maintenance plan is one of the smartest ways to care for your flat roof. These plans typically include regular inspections, cleaning, and minor repairs to keep your roof in top shape year-round. A maintenance plan takes the guesswork out of roof care and ensures small problems are caught before they become major headaches.

🏢 Tar and Gravel Roofs

At GreenTek, we understand that your roof is a critical part of your home or business, and when it comes to tar and gravel roofs, you need a team you can trust. With years of experience, cutting-edge technology, and a commitment to exceptional craftsmanship, our team delivers reliable, long-lasting roofing solutions tailored to your needs.

Whether you’re looking to repair, replace, or install a tar and gravel roof, we’re here to guide you every step of the way. Contact us today for a free inspection or free estimate, and let’s get started on your roofing project. Trust GreenTek to protect what matters most!