Poly Injection vs Epoxy injection for Foundation Crack Repair

Foundation cracks can occur for a number of different reasons. But regardless of what caused them, you need to get them fixed. If you’ve explored foundation repair options, then you may already know that there are two ways to address the problem with injections—a poly injection or an epoxy injection. Epoxy injection is an old technology and has disadvantages that need to be addressed. Even so, some foundation repair companies are still using this outdated approach.

In this blog article, we’ll explain how poly injections—which is the abbreviated reference to polyurethane injections and will be used interchangeably in this article—work and why they’re the best choice for your foundation repair.

What is Polyurethane?

In order to understand what makes it a superior product for sealing cracks, you might first want to understand what polyurethane is. Scientifically speaking, polyurethanes are a highly variable family of polymers, which are materials formulated from linking a series of simple, repetitive molecules. These substances can be tailored into various forms and ultimately used for a broad range of applications.

In terms of polyurethane utilized for crack repair, this rubbery material comes in fluid resin form which, when injected into cracks, will undergo a chemical transformation from a liquid to a solid. As this occurs, it is expanding exponentially and fully filling in every crevice of that crack. It cures while it’s expanding, which is ideal for waterproofing.

Why Is Poly Superior to Epoxy?

When injecting poly into a crack, it’s continually expanding so much that it oozes outside—making it apparent that it has completely filled every tiny crevice within that crack. As mentioned, it expands while it cures, and that makes a big difference in its effectiveness. Epoxy does not expand while curing making it virtually impossible to fill an entire crack with this substance. There’s no way to get 100-percent injection of a crack when using epoxy.

Epoxy is also not effective on wet concrete. With epoxy, it used to be that the homeowner would need to wait for the rain to stop and the ground to completely dry out before foundation repair could even begin as epoxy will not adhere to wet concrete. We have found that old cracks repaired with epoxy have ultimately begun to leak.

Epoxy also lacks the flexibility of rubbery poly. This means that when your foundation shifts, as often happens, the epoxy (being so hard and rigid) will ultimately crack. Ply, on the other hand, will remain in contact with the concrete and move with the foundation. This is a huge advantage.

Getting Value Out of Your Foundation Repair

We understand that water in your basement is a hassle that you shouldn’t have to worry about. While there was a time when epoxy was the only material out there for repairing cracks, the times—and the technology—have changed. While there are still companies that will use epoxy, the fact is, follow-up repairs will almost certainly be needed as this material has been proven to leak.

That’s why we will only use poly when we’re repairing a crack. In fact, Adams Foundation Repair & Waterproofing has a zero-failure rate when we waterproof by injecting polyurethane.

Despite all of the value that you’re getting out of a job done the right way, we also found that our foundation repair cost is on par with our competition. That means you won’t spend a whole lot of extra money, but you’ll also gain the peace of mind that the job won’t need to be performed again because the material failed.

After all, the last thing that we want is for you to have to go through the headache of re-repairing cracks when a better solution is out there. That’s why when you’re searching online for foundation repair near me, we advise that you ask prospective companies what type of material they use for crack repair. They may be shocked that you’ve taken a step to educate yourself on materials—and the advantages and disadvantages of what’s out there. But if they say that they only use epoxy, you should absolutely be wary of the results you’re going to get.

Making a Wise Choice for Foundation Repair

We hope that by better understanding your options, that you’ll be able to make a wise choice when it comes to foundation repair. Unfortunately, there are a lot of companies that haven’t kept up with improving technology and therefore aren’t offering their customers the best options. They’re taking advantage of the fact that most homeowners don’t really understand what poly vs. epoxy means. But now that you understand the difference, you can make a wise choice that will give you the peace of mind you deserve.