Concrete Crack Injection Repair in Montgomery, AL

Concrete foundation cracks are common in Montgomery, Alabama homes, but not all cracks

require the same repair. Concrete crack injection is a proven method for sealing cracks and

restoring structural integrity. Understanding the process helps you decide if injection is right for

your home.

When Crack Injection Is Appropriate

Crack injection works for non‑moving cracks that are not leaking significant amounts of water.

It is ideal for vertical or diagonal cracks in poured concrete foundations, as well as cracks in

basement walls. For structural cracks (wider than 1/4 inch or actively moving), injection alone is

not enough—you need piers first. Montgomery Foundation Repair Co evaluates each crack to

determine if injection will be effective or if underpinning is required first.

The Injection Process

We start by cleaning the crack of dirt, dust, and loose concrete. Then we install injection ports

(small plastic fittings) along the crack at intervals. We seal the surface of the crack with an

epoxy paste. After the paste cures, we inject either epoxy or polyurethane resin under low

pressure, starting at the lowest port and moving upward. The resin flows through the crack to

the opposite side. For polyurethane, the resin expands as it cures, filling voids. After curing, we

remove the ports and grind the surface smooth. Montgomery Foundation Repair Co completes

most crack injections in one day.

Epoxy vs. Polyurethane for Concrete Cracks

Epoxy injection restores the concrete’s original strength, making it the choice for structural

repairs where load‑bearing capacity matters. It is rigid and does not tolerate movement.

Polyurethane injection creates a flexible, waterproof seal that can accommodate minor

movement. For foundation cracks in Montgomery’s expansive clay, polyurethane is often

preferred because it allows for seasonal movement without breaking the seal. Montgomery

Foundation Repair Co uses polyurethane for most residential crack repairs, unless an engineer

specifies epoxy for structural reasons.

After Injection: What to Expect

After injection, the crack is permanently sealed (unless new movement occurs). You can paint

over the repair. Water will no longer seep through that crack. However, injection does not stop

foundation settlement. If your foundation continues to move, the crack may reopen elsewhere.

Montgomery Foundation Repair Co provides a warranty on crack injection, but the warranty is

void if the foundation settles further. We always check for settlement before recommending

injection.

Frequently Asked Questions