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Top 6 Flat Roof Sealants (2025)

Posted on January 26, 2025

flat roof sealants

Given their affordability and versatility, flat roofs are a popular choice for both residential and commercial buildings, but they must be properly sealed to avoid leaks. However, with so many sealant options available, choosing the right one can seem overwhelming. 

In this blog post, we’ll review the top six flat roof sealants of 2025 in order to help you make the right decision for your flat roofing needs.

Why Do Flat Roofs Require Sealants?

Flat roofs require sealants to create a waterproof barrier that prevents water infiltration, which is crucial since these roofs tend to collect water and experience pooling more than pitched roofs. Without proper sealing, water accumulation can lead to leaks and significant structural damage over time. 

Additionally, sealants protect the roof from UV damage and help extend its lifespan by sealing gaps, joints, and other vulnerable areas. By applying sealants, property owners can effectively reduce the risk of water-related issues and maintain the integrity of their flat roofs for longer.

6 Of The Best Flat Roof Sealant Products

Finding the right sealant can be tricky, so let’s dive into the top six choices you can choose for your home in 2025: 

#1. Tremco Vulkem® 116

Tremco Vulkem® 116
Tremco Vulkem® 116 Source: tremcosealants.com

The first option in our list, Vulkem® 116, is a high-quality, textured polyurethane sealant perfect for commercial and construction uses. This moisture-curing sealant offers strong adhesion and flexibility, ideal for sealing joints in concrete, masonry, and around windows and doors. It works in a wide range of temperatures and cures over time, providing durable, long-lasting results. With its ability to handle joint movement and no need for a primer, Vulkem 116 is easy to apply, paintable, and available in several colors, making it a reliable sealing solution.

#2. Everest Systems Everseal Sealant

With Everseal, you get a high-performance, 100% silicone solids sealant that combines urethane and silicone for industrial use. This self-leveling, moisture-curing sealant provides strong adhesion and flexibility on PVC, metal, and concrete, even in tough conditions. It can withstand temperatures from -40°F to 200°F, making it ideal for damp surfaces or rainy weather, offering the best waterproof sealant for flat roofs. Resistant to mildew, UV damage, low odor, and minimal shrinkage, Everseal is available in tan and light gray and is VOC compliant, making it a safe and effective sealing solution.

#3. Ames Maximum-Stretch® Roof Sealant

Maximum-Stretch® sealant keeps flat roofs with EPDM membranes from peeling or cracking. With a white finish that reflects 88% of light, surface temperatures and cooling expenses are reduced with the use of this sealant. It is easy to apply using common tools and adheres well to built-up roofs and metal surfaces, making it perfect for both residential and commercial flat roofing options. 

#4. Flex Seal® Liquid Rubber Sealant

Flex Seal® Liquid Rubber Sealant
Flex Seal® Liquid Rubber Sealant Source: amesresearch.com

For sealing moisture, water, and air out, Flex Seal Liquid is a rubberized, thick sealant ideal that’s suitable for roofs as well as foundations. It can be brushed, rolled, dipped, or poured on roofing surfaces, and it’s available in black, white, clear, and gray. It even cures within 48 hours, allowing you to make quick repairs as needed. 

#5. Gardner® Construction & Roof Sealant

Gardner® Construction & Roof Sealant
Gardner® Construction & Roof Sealant Source: gardnercoatings.com

The next option, Gardner® Construction & Roof Sealant, is a high-performance, premium sealant designed for superior waterproofing and roof protection. It bonds well to a range of surfaces, including metal, asphalt, and concrete, ensuring a strong, long-lasting seal that can withstand harsh weather. With its easy application and fast drying time, it’s perfect for professionals, and even DIY, enthusiasts. Offering excellent UV resistance and flexibility, this sealant prevents leaks and extends the life of your roof, making it an essential tool for any home maintenance project.

#6. American Weatherstar Terminator™ 622 Roof Sealant

American Weatherstar Terminator™ 622 Roof Sealant
American Weatherstar Terminator™ 622 Roof Sealant Source: americanweatherstar.com

Specifically designed for industrial use, Terminator™ 622 is a 100% solids, moisture-cure roof sealant, and adhesive. Offering UV resistance and long-lasting protection, this versatile sealant works on a range of surfaces, even those that are damp. It effectively reinforces penetrations, end laps, seams, and other key flashing areas. Easy to apply with a brush, and VOC compliant, this sealant is a reliable and efficient choice for roof repairs, ensuring durable, dependable results.

Criteria for Selecting Flat Roof Sealants

As you can tell from the options, there are numerous types of sealants available, and choosing the right one for your needs will vary based on certain factors:

1. Waterproofing Ability

Roof sealants should prevent water from penetrating through the roofing material. Look for products with strong waterproofing abilities, especially if you live in an area that receives heavy rainfall or snow.

2. UV Resistance

UV rays can cause sealants to crack and break down. A sealant with high UV resistance offers longer-lasting protection from sun damage.

3. Flexibility

Sealants should adjust to temperature changes without cracking or losing adhesion. Flexibility is key to maintaining a strong, watertight seal.

4. Durability

Consider how long the sealant lasts. Some need to be reapplied every few years, while others provide long-term protection, saving time and money.

5. Ease of Application

Choose a sealant that’s easy to use, especially if you’re doing it yourself. A sealant that’s easy to apply reduces the risk of errors that can lead to failure.

6. Environmental Impact

Look for eco-friendly options with low VOCs. Sealants that help reflect sunlight can also directly affect the building’s energy efficiency. 

7. Compatibility with Roofing Material

Make sure the sealant works well with your roofing material. Different flat roofing membranes and other roofing systems like BUR roofs, need specific types of sealants.

8. Climate Suitability

Consider your area’s climate. Flat roof silicone sealant works well in rainy regions, while acrylic sealants are better for places with large temperature changes.

9. Application Method 

Pick a sealant that suits your preferred application method (brushing, rolling, or spraying) for better ease and effectiveness.

Protect Your Flat Roof with B & A Roofing and Gutters Flat Roofing Services

Choosing the right flat roof sealant is crucial for long-lasting protection. By considering factors like durability, weather resistance, ease of application, and cost, you can select the best sealant to suit your needs and ensure your roof stays protected for years to come.

Looking for reliable flat roofing services? Our experienced team at B & A Roofing and Gutters specializes in flat roof repairs and replacements, providing durable, leak-free solutions for your home or business. We use quality materials, including flat roof sealants, to ensure long-lasting protection. Contact us today at (601) 520-3183 for the best in flat roofing!

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