Fixing a Foundation Crack from the Outside
A homeowner had a foundation crack that seeped after heavy rain. They had applied an interior hydraulic cement patch twice, and twice it had held for a while before dampness returned around the edges. The patch was not failing because the product was bad. It was failing because it was on the wrong side of the wall.
Foundation cracks leak because water is on the outside pushing in. An interior patch stops the water from reaching the basement, but it does nothing to stop the water from entering the wall. The pressure builds behind the patch, finds the weakest path, and eventually works around it. To stop the leak permanently, you have to seal the crack where the water enters, on the exterior.
We excavated a narrow trench down to the footing alongside the cracked section, exposing the crack from outside. We cleaned the wall, injected the crack with epoxy to restore structural bond across the fracture, and then applied a waterproofing membrane over the repaired area, extending it onto the surrounding wall. Over the membrane we installed drainage board and backfilled with free-draining gravel to a footing drain. The approach combines our concrete repair and waterproofing expertise.
The result was a repair that addresses both the structural crack and the water pathway. The epoxy welds the concrete, and the membrane stops water from ever reaching it. The interior patch was removed so the wall can breathe inward, which is the correct behavior for a foundation. The basement has stayed dry through every storm since.
Exterior repair is more involved than an interior patch, but it is the difference between a fix and a recurring problem. Not every crack needs exterior excavation. Dormant, non-leaking cracks can often be injected from the interior. But when a crack is actively leaking and interior patches have failed, the exterior is where the answer lives. Our leak repair services start with diagnosis to determine which approach fits.
We also checked the surface drainage, because a foundation crack only leaks if water is present. A downspout was discharging near the corner, and the grade sloped toward the wall. Redirecting the downspout and regrading reduced the water load dramatically, protecting both the repair and the rest of the foundation.
If you have a foundation crack that keeps dampening, stop patching the inside. The water is telling you where it comes out, not where it goes in. Contact us for an evaluation that finds the right side of the wall to fix.
The right side of a foundation repair is the side the water is on. Everything else is temporary.
