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5 Best Flat Roof Sealants of 2024

Posted on March 24, 2024

5 Best Flat Roof Sealants of 2024

Are you a flat roof owner? Are you also facing issues such as standing water and frequent roof leaks? If yes, then this is the blog post you have been searching for. Though flat roofs give you that extra space, since they have a minimal slope, they can have trouble diverting water into the gutters. Because of this, sealing and waterproofing are even more necessary. 

Now, we know you are busy and might not have much time to research which sealant is best for your flat roof. To help, we have created a list of the best flat roof sealants in 2024 that are sure to enhance the durability of your building. But before we move ahead, it’s important to know what types of sealants are there and what to look for in a waterproof sealing product. 

Top Materials Roof Sealants

When it comes to sealing and waterproofing flat or low-slope roofs, there are several different sealant material available:

Acrylic Sealants

Acrylic-based roof coatings and sealants are among the most popular options. They provide excellent UV resistance and can expand and contract with temperature fluctuations. Acrylic sealants are easy to apply and form a flexible, protective membrane.

Silicone Sealants

Silicone-based sealants offer superior weathering resistance. They are extremely durable and can withstand wide temperature variations without cracking or becoming brittle. Silicone forms a watertight yet breathable barrier.

Polyurethane Sealants

Polyurethane formulations cure to create a tough, abrasion-resistant seal. They have excellent adhesion to many roofing materials and remain flexible over time. Polyurethane sealants are ideal for sealing seams, fasteners, and details.

Butyl Sealants

Butyl rubber sealants and tapes are known for their high flexibility and longevity. They adhere well to most roof surfaces and can withstand ponding water. Butyl provides a long-lasting, waterproof seal.

Types Of Roof Sealants 

In the last section, we discussed the compounds that are used to make the best flat roof sealants. However not all sealants come in the same form. Here are the popular types available on the market:

Liquid Roof Sealants

These are the most common type of roof sealant and come in liquid form. They can be applied with a brush, roller, or spray gun. Liquid roof sealants can be made from different materials like silicone, acrylic, or asphalt.

Caulk Sealants 

Caulk sealants are used for sealing small gaps and cracks in roofs. They come in tubes and can be applied using a caulking gun. Caulk sealants can be made from silicone, acrylic, or other materials.

Roofing Tape 

Apart from liquids, sealants are available in strips too. Also known as roof tape or flashing tape, is a type of sealant that comes in a roll. It is often used to seal seams, joints, and edges on roofs. Roofing tape is moisture resistant and is made from materials like butyl rubber or asphalt. It has a sticky backing for easy application.

Spray Sealants 

Spray sealants are applied using a spray gun and are useful for covering large areas quickly. They are often made from materials like silicone or acrylic.

Best Roof Sealant Products 

#1 Gorilla Waterproof Patch & Seal Tape

Gorilla Waterproof Patch & Seal Tape

Gorilla Waterproof Patch & Seal Tape provides an effective solution for sealing small gaps or cracks in your flat roof. This durable tape features an impressive adhesive layer that allows it to form a permanent, watertight bond on surfaces both inside and on exterior surfaces. 

The flexible, UV-resistant backing adjusts easily to corners, curves, and uneven areas, allowing for quick patching of crevices, cracks, and tears, even on surfaces underwater. 

It can withstand extreme temperatures from minus 70 to 200 degrees. With a roll length double that of other flexible tapes, this product provides extended coverage. Gorilla offers versatile pack options of 1, 2, or 4 rolls to meet varying project needs. At 4-inches wide, a single roll covers approximately 10-linear feet.

#2 Liquid Rubber Waterproof and Protective Coating by Rubberseal

Liquid Rubber Waterproof and Protective Coating by Rubberseal

The Liquid Rubber Waterproofing and Protective Coating offers excellent insulating properties, making it an ideal choice for flat roof as well as pitched roof applications. This coating forms an impervious, watertight membrane that resists ponding water with ease. 

It also has an EPA Energy Star rating for its high reflectivity. Formulated with low VOC levels and impressive flexibility, this liquid rubber coating expands and contracts alongside substrate movement without cracking or peeling. This helps to extend the lifespan of your membrane roof. 

Its durable composition resists aging and UV exposure. When applied at the recommended thickness, 1 gallon covers approximately 60-square feet. There are several available sizes, ranging from 32 oz up to 5 gallons. 

#3 Flex Seal Liquid Sealant

Flex Seal Liquid Sealant

Next on our list is another versatile liquid rubber sealant solution. The Flex Seal Liquid delivers exceptional waterproofing protection and comes in a convenient can. This innovative rubber coating seamlessly keeps water, air, and condensation from damaging your flat roof. Plus, it can be applied with different methods, you can either use a brush or roller to apply it to the surface. 

Its smooth application dries to a flexible, breathable finish ideal for roof repairs, basements, and even marine applications. Flex Seal Liquid offers superior UV resistance to prevent degradation from harsh sunlight. The chemical-resistant formula also prevents rust and corrosion. This roof sealant comes in white, black, gray, and clear, and is available in 16 oz, 32 oz, and 1 gallon sizes. 

#4 Gorilla Waterproof Patch & Seal Liquid Rubber Sealant

Gorilla Waterproof Patch & Seal Liquid Rubber Sealant

For the next flat roof sealant, we have another offering from the trusted brand Gorilla. We have already highlighted their Waterproof Patch & Seal Tape, a heavy-duty solution for sealing minor gaps and holes. Now we have Gorilla’s Waterproof Patch & Seal Liquid Rubber Sealant.

This flexible liquid coating forms a tough layer on your roof that protects it from leaks and pooling water. It can be applied easily using a brush, roller, or trowel, or using pour methods. Though primarily for roofs, you can also use it on gutters, skylights, and around foundations. 

This sealant has a self-leveling formula, which enables it to smoothly fill even the smallest holes and cracks to create a reliable, watertight seal. When fully cured, the rubberized coating shows excellent resistance to extreme temperature and UV rays for a long-lasting fix that withstand the elements. 

Another advantage is that this sealant can be painted with latex or oil-based paints, allowing you to maintain the aesthetics of your roof. It’s available in both black and white and comes in a 32 oz container. 

#5 Maximum-Stretch® Elastomeric Roof Coating and Sealant by Ames 

Maximum-Stretch® Elastomeric Roof Coating

For the final waterproofing product on our list of flat roof sealants, we have the Ames Maximum-Stretch Roof Coating. This versatile product can be used as either a roof coating or a sealant. It provides an exceptional elastomeric, acrylic-based solution for waterproofing and protecting flat and low-slope roofs. 

This rubberized coating boasts incredible 650% elongation capability, allowing it to resist cracking and peeling even as the roof surface expands and contracts. It’s highly reflective, and the bright white finish helps lower the temperature of the roof, leading to lower cooling costs for the home or building. Ames Maximum-Stretch adheres to most types of flat roofs, such as metal, built-up roof membranes, and EPDM. Designed for low-slope roof maintenance, this environmentally-friendly, non-toxic formula contains low VOC levels. This sealant is available in multiple sizes, from 1 gallon to 250 gallon containers. 

Best Flat Roofing Services In The Gulf Coast 

Flat roofing maintenance can be a challenge, but it doesn’t have to be with the team of Renova Roofing & Construction by your side. We are premium roofing contractors serving the states of Mississippi, Alabama, and Louisiana. Our team will not only help you choose the best roof sealant but will also install it. We also offer flat roof repair and replacement services. 

Contact us today at (601) 647-3433 to learn more about our services.