How To Apply Elastomeric Roof Coating (Quickly & Easily!)

Stacy Randall
by Stacy Randall

It’s not a “stretch” to see the benefits of elastomeric roof coating when homeowners seek ways to upgrade their homes. But what is elastomeric roof coating? Elastomeric roof coatings are polymer-based products that form an elastic, water-resistant seal that expands and contracts, assuring longer roof life.

To apply elastomeric roof coating, you will first need to clean your roof surface of any debris. After cleaning, ensure the surface is thoroughly dry, which can take up to four hours depending on the weather. Repair damaged areas and seal cracks, and then you should be able to apply an initial coat onto your roof.

If you consider applying an elastomeric coating to your home’s roof, it is a relatively easy DIY project. With proper planning and the correct tools, you could have a more durable, energy-efficient roof in a short time!

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Applying Elastomeric Roof Coating

When applying elastomeric coating on your roof, follow this step-by-step process to ensure proper application. Plus, ensure to gather all the necessary supplies before applying an elastomeric roof coating.

Materials You Need for the Job:

  • A broom or power blower 
  • A pressure washer 
  • Fiberglass mesh, fiberglass, or acrylic roof sealant 
  • Trowel or roof brush 
  • A paintbrush 
  • A roller 
  • Elastomeric roof coating 

Step 1: Clean the Roof to Remove Debris and Surface Contaminants

To ensure adhesion and coverage, you must make sure the surface is clean and free of any debris. Clean the roof as much as possible, and pick up any large pieces of debris. Use a blower or a broom to remove any remaining dirt and debris off the roof. Then, use a power washer to clean the roof.

Step 2: Allow the Surface to Dry

The cleaned surface must now be allowed to dry thoroughly before applying your first coat. Wait until it dries completely to proceed. This can take anywhere from one to four hours or more, depending on humidity and other weather factors.

Step 3: Evaluate and Repair Any Damage

Thoroughly evaluate your roof for any seams or cracks. You can make repairs with a fiber mesh mat or fiberglass. More extensive damage may require patching. Be on the lookout for blisters, cracks, and other problem areas needing attention.

An acrylic roof sealant is a good solution for this step. You can use a trowel or roof brush to apply the patching compound.

Step 4: Apply the Initial Coat of Roof Coating

Begin by reading the directions of the coating product of your choice. Pay particular attention to whether it is appropriate for the slope and material of the roof. Apply the elastomeric roof coating.

You can generally apply coating in one of two ways, depending on the project’s particular needs. You can roll many products with a roller or apply it with a paintbrush in smaller areas. Also, there are other products you can apply with a spraying device.

Maintaining a wet edge at all times is imperative when working with a roller. Work from one side from the outer edge, inward and toward the opposite side. Seal any edges around pipes and other roof fixtures.

Step 5: Allow the Surface to Dry

After you apply your initial coat, allow the surface to dry. This can take anywhere from 24 to 48 hours, depending on weather factors such as temperature and humidity.

Step 6: Recoat the Roof Surface

Once your initial coat has dried, apply a second coat and allow it to dry.

Tips for Applying Elastomeric Roof Coating

Besides the easy step-by-step instructions for applying elastomeric roof coatings, there are some additional handy tips to help you along. The best weather for the application of elastomeric roof coating is a bright, sunny day. Try not to choose a day which is particularly hot.

A paintbrush works better for application around smaller fixtures, while a roller works best to cover large expanses. When evaluating any necessary repairs prior to application, be sure to employ a professional should the damage be extensive.

While in most circumstances elastomeric coating will dry within a day or two, it takes longer to cure completely. Avoid trafficking across your roof for at least a week. Depending on the weather, a full cure can even take a bit longer.

Don’t worry if it rains in the days following application; this won’t affect the coating’s integrity. However, pervasive weather will extend the curing process. It is advisable in damp climes to remain off your roof for at least thirty days.

Types of Elastomeric Coatings

There are four main types of elastomeric coating.


Butyl based elastomeric coating is best suited in projects involving flat and low-sloping roofs. It works well in areas with torrential rain. It can withstand a strong water force and is a good vapor barrier.


When considering longevity, acrylic is one of the most long-lasting materials for an elastomeric roof coating. It has a higher environmental efficiency rating than other coatings. It is also best suited for use on high roofs with multiple slopes.


For an ethylene propylene diene monomer rubber roof (EPDM), polyurethane is the best choice for sealing leaks and waterproofing. It is a good choice for single-ply roofs as it does not require special PH rinses and has high versatility.


Silicone is the best coating component for polyurethane foam roofs. You can repair some weathering with this particular type of material. Additionally, you can easily reapply it over prior coats of silicone.

Benefits of Elastomeric Roof Coating

While you can apply elastomeric roof coating as easily as regular paint, its benefits far surpass any normal latex paint.

Extended Roof Lifespan

Through the seamless layer, elastomeric roof coating provides your roof benefits from added protection against damaging ultraviolet rays. Additionally, homeowners will see additional protections against other atmospheric pollutants, such as salinity and other harmful compounds. With proper application, homeowners can enjoy as much as twenty extra years on the life-expectancy of their home’s roof.

Energy Efficiency

Are you having trouble beating the heat inside your home? One reason is that your roofing system absorbs heat from direct sunlight. Elastomeric coatings can provide an effective solution.

White coating can reflect sunlight and solar heat. With less heat absorbed through the roof or your vinyl siding, there is less need for indoor cooling. This can result in smaller utility bills!

Protection Against the Elements

Different areas of the country are susceptible to gale force winds, hurricanes, and other severe weather. Roofing systems with seams provide wedge points that could result in portions of the roof prying off in punishing winds. Elastomeric coatings are a seamless option to help prevent rainwater from entering the substrate and, subsequently, leaking into your ceiling.

Easy Repair and Maintenance

Repairs are easy to do by only reapplying the roof coating at the damaged spots. There’s no need for scraping, teardowns, waste materials, nor complicated machinery. A small team can do it in only a fraction of the time otherwise spent on conventional roofing.

Extra Considerations When Choosing Elastomeric Roof Coating

There are many factors to consider when evaluating which elastomeric coating is right for your project.


A material’s ability to stretch is its elasticity. This is an essential element to consider when choosing an elastomeric coating. High elasticity means a coating will be able to adjust to extremes of temperature and weather without cracking.

In addition to elasticity, you must also consider recovery. A quality product will also be able to recover as well as stretch.

Tensile Strength (New and Old)

A product’s ability to maintain integrity without breakage is its tensile strength. Homeowners must consider product integrity when the coating is brand new but also after it has weathered.

Perm Factor

Look for a lower perm factor number when considering elastomeric coatings. The lower the number, the less moisture can pass through it.

Moisture Gain by Weight

Absorption of moisture into a roofing material can speed roof aging and deterioration. Look for a roof coating that repels water away from the roof.

Peel Adhesion

An effective elastomeric coating will remain adhered to your roof. Avoid products that demonstrate peeling.

Tear Resistance

Seal retention is critical to a high-performance roof coating. Ensure you are choosing a coating with high ratings against tear resistance from regular traffic and environmental shifts.


Choosing an elastomeric coating with high reflectivity will result in energy efficiency and less maintenance due to UV damage.

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Related Questions

Where can you use elastomeric coatings?

Elastomeric coating has a variety of applications. You can use it on stucco, concrete, masonry, and more. Elastomeric coatings are not restricted to use on roofs but can be used on walls as well.

How do I choose the best elastomeric coating for my project?

No two roofs are alike. Location, construction, sun, and weather are just a few factors homeowners must consider when choosing the best elastomeric coating. The durability of your roof relies on a host of physical characteristics. It is advisable to look at every component when reviewing options. The best choice will be the one which performs on every single count. 

How long do elastomeric roof coatings last?

With regular maintenance, elastomeric coatings can last a long time. Care includes occasional cleaning with a power washer or hose and a reapplication every ten to fifteen years.

Stacy Randall
Stacy Randall

Stacy Randall is a wife, mother, and freelance writer from NOLA that has always had a love for DIY projects, home organization, and making spaces beautiful. Together with her husband, she has been spending the last several years lovingly renovating her grandparent's former home, making it their own and learning a lot about life along the way.

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