Epoxy and Polyurethane Crack Injection: Sealing Foundation Cracks From the Inside

For a narrow crack in a poured concrete wall that lets groundwater seep through, injection is a direct way to seal that path, and polyurethane is designed to follow and seal water inside the crack. It does not lower the water pressure or change the soil outside the wall. If water is also finding other routes in, or if the wall is concrete block, a different approach such as an interior drainage system may be needed, which we look at before recommending injection.

Not on its own. Injection seals the crack you can see, but it does not change the force that opened it. In the Piedmont, that force is often clay soil swelling and shrinking against the wall through wet and dry seasons. In coastal areas it is often a high water table pressing on the wall. If the crack comes from active movement or foundation settlement, we treat injection as one part of a plan and may recommend a closer structural look so the underlying cause is addressed.

No. Injection is well suited to many narrow cracks in poured concrete walls. It is not the right tool for every situation, such as cracks in concrete block walls, cracks that are actively widening from significant structural movement, or cases where the real issue is settlement or wall movement that needs to be stabilized first. We will tell you plainly when injection is not appropriate and what we would recommend instead.

There is no set price, because the cost depends on the crack and what is behind it. The length and width of the crack, how many cracks there are, epoxy or polyurethane, and access to the wall all shape the price, along with any structural or interior waterproofing work the cause calls for. The free inspection finds the cause, and you receive a written estimate at no cost before any work is scheduled.

How foundation repair services are priced

In most cases, yes. Injection is done from inside the wall by setting ports along the crack and filling it with resin, so it generally does not require digging around the outside of the foundation to reach the crack. For a suitable crack in poured concrete, that typically means a less disruptive repair. Whether it is the right approach for your wall depends on the crack and the cause, which is what the inspection confirms.