Skip to main content

Epoxy Resin: The Best Concrete Expansion Joint Filler Material

Epoxy Resin: The Best Concrete Expansion Joint Filler Material

Long-term care for long-term floors.

Any contractor worth their salt knows that expansion joints in concrete flooring helps keep it safe and secure against the forces of nature. They provide a buffer between slabs, absorb any natural movement due to changes in temperature or humidity, and prevent damage caused by stressing on walls and floors. Expansion joints give you peace-of-mind that your installation is safeguarded against potential issues!

But that doesn't mean they don't come with their own problems - a gap in your concrete introduces new vulnerabilities. So, how can epoxy help?

What is a Concrete Expansion Joint?

For those looking for an enduring and robust flooring option, concrete is the gold standard. However, thermal expansion and contraction can cause even a solid foundation to crack or fail if left unchecked - that's why it’s essential to install expansion joints in your slab! Control joints are necessary for protecting against damage caused by fluctuating temperatures, but they must be managed properly, as water infiltration or dirt buildup can lead to mounting issues of their own.

For lasting strength and beauty in concrete flooring, expansion joints are essential. Without them, the pressures of contraction and expansion can cause cracks or even total failure over time - a potentially costly problem! Concrete expansion joints provide an effective, and efficient, solution to thermal movements.

Are There Different Kinds of Concrete Control Joints?

Yes! There are a few different types of concrete expansion joints depending either on your project, or your preference. From the specific design, to the filler material, there's some amount of flexibility that comes with your joints. To name just a few:

  • Concrete slab expansion joints are the most common, used mostly in commercial and residential applications, and are built to withstand basic pressures and strength tests.
  • Railway expansion joints are tougher, more specialized joint designs for railroads when crossing across more extreme environments.
  • Pipe expansion joints are an important part of concrete infrastructure as well, especially when the pipes are changing temperatures frequently, or rapidly.

There's also some customization when it comes to filler material, such as asphalt, cork, fiber, epoxy, etc. Here at EpoxyETC, we have a bias towards epoxy and polyurea solutions for your concrete control joint filler needs. Hear us out, and let us explain why you should, too!

Image showing the grinding of a large industrial floor, before sealing.

Why Epoxy Resin to Fill Concrete Expansion Joints?

If you're in the flooring or concrete industry, you know that expansion joints are crucial for maintaining the integrity of your concrete surfaces. You also know that filling them is just as important as having them in the first place. Epoxy has rapidly become a go-to solution for concrete joint filling over traditional options like asphalt or rubber. Unlike those materials, epoxy is designed to be strong, flexible, and incredibly durable. Plus, its waterproof seal prevents water damage and grime accumulation.

It's crucial to use an epoxy resin that's designed specifically for concrete expansion joints. Don't forget this part; you need to trust the resin you use to ensure the longevity and durability of your concrete surfaces. Ordinary epoxy resins may not have the necessary flexibility and strength to withstand the constant movement and stress that occur in concrete expansion joints.

The wrong epoxy resin may crack, peel, or even fail in the concrete joint filling, leaving your concrete surfaces vulnerable to everything we've mentioned so far. That's why it's essential to use a high-quality epoxy resin, like what you can buy here at EpoxyETC. Whether you're looking for epoxy joint filler, or polyurea polymer concrete joint filler, you can get it here.

How to Fill Concrete Control Joints With Epoxy

For a successful and long-lasting concrete joint filling with epoxy, proper preparation is essential. The first step, after you cut the joint with the proper tools, is to ensure that the joint surface and gap are free of any dirt, debris, and water. You can achieve this by using a vacuum cleaner or a powerful stream of air to blow off any dust and dirt.

Application is a breeze - simply use a squeegee, pour or trowel to fill in pre-cut joints with the resin. As it hardens, the epoxy bonds with the concrete, creating an impenetrable barrier to liquid, dirt and more. Secure your concrete expansion joints with an epoxy resin - it's ultimately a personal preference, but the flexibility, long term resistances and other great qualities have us choosing epoxy every day of the week.

If you work with epoxy flooring, or you have an interest in the industry, consider enrolling into an epoxy flooring certification program. Getting certified is an easy way to massively improve your success as a contractor. To have an experienced contractor guide you is an incredible tool that you shouldn't neglect.


In summary, concrete expansion joints are crucial for maintaining the integrity of concrete slabs. When used in conjunction with a high quality epoxy filler, you enjoy a range of benefits, from increased durability, to resistance to high pressure. With proper preparation and installation, epoxy fillers provide long-lasting protection for your concrete construction projects, whether as a joint filler or a flooring solution. So, if you want to protect your concrete surfaces, be sure to consider epoxy fillers as a top option.

Are you looking for help with your concrete construction project, or more information about epoxy resin? Call our technicians at (954) 228-8856! Check out our EpoxyETC online store and see the options you have to choose from for your flooring resources.


Be the first to comment.
All comments are moderated before being published.

Your Cart

Your cart is currently empty.
Click here to continue shopping.
Thanks for contacting us! We'll get back to you as soon as possible. Thanks for subscribing Thanks! We will notify you when it becomes available! The max number of items have already been added There is only one item left to add to the cart There are only [num_items] items left to add to the cart