Foundation Crack Repair

What Foundation Crack Repair Involves

Foundation cracks form when the concrete comes under more stress than it can absorb — usually from hydrostatic pressure pushing against the wall from wet soil outside, from the concrete shrinking as it cured, or from the freeze–thaw cycles that put Toronto foundations through repeated expansion and contraction every winter. Some cracks are cosmetic. Others are the first visible sign of a bigger drainage or structural issue. The only way to tell the difference is to look at the crack itself: its width, direction, and whether it’s actively letting water through.

Our repair process starts with that assessment, not with a generic quote. Vertical and diagonal cracks in a poured concrete wall are usually the most straightforward to repair with injection. Horizontal cracks and stair-step cracks in a block foundation are treated more cautiously, because they can point to soil pressure or settling that needs a broader fix than injection alone.

What’s Included

• On-site crack assessment — width, direction, active leakage, and a look at the grading and drainage around that section of foundation.
• Low-pressure epoxy injection for structural, non-leaking cracks, which bonds the concrete back into one solid piece.
• Polyurethane injection for active or intermittent leaks, which expands to seal the crack and stop water even under pressure.
• A written recommendation if the inspection points to something injection alone won’t solve, such as exterior waterproofing or underpinning.

What to Expect

1. Inspection & assessment. We look at the crack in person, from inside and, where accessible, outside.
2. Written estimate. You get a clear scope and price before any work is scheduled.
3. Site preparation. The area around the crack is cleaned and prepped for injection.
4. Injection repair. Epoxy or polyurethane is injected through the full depth of the crack, not just patched over the surface.
5. Cure & final check. The repair cures and is inspected before we consider the job complete.

When to Call Us

A hairline crack that isn’t growing or leaking often isn’t urgent, but it’s still worth a look so you know what you’re dealing with. Call sooner if you notice:

Frequently Asked Questions