The permanent fix for leaking foundation cracks — injected while they’re still leaking, sealed for life, no digging.
Polyurethane crack injection seals leaking foundation cracks by injecting an expanding resin that reacts with water, foaming to fill the crack’s full depth and every hairline branch. Because water activates the cure, it works on actively leaking cracks — no drying, no excavation, sealed in one visit. It remains flexible, so seasonal wall movement won’t break the seal. Not sure whether yours is a shrinkage crack or something structural? Our guide to the five types of foundation crack explains the difference, and why polyurethane is a waterproofing repair rather than a structural one.
Pricing reviewed regularly
A leaking basement is stressful. The fix shouldn’t be.
A quarter-century of GTA basements kept dry.
Injection repairs warrantied for life — and the warranty moves with the house when you sell.
Full commercial coverage on every job, every crew, every home.
Eligible contractor for City of Toronto, Peel & Halton basement-flooding subsidy programs.
Inspection, honest diagnosis, and an exact per-crack quote — free, no pressure.
Your price is confirmed in writing before any work starts — no hourly surprises.
• The crack leaks — during storms, spring melt, or constantly
• The crack is wet or damp, even without standing water
• Hairline networks and branching cracks
• Cold joints and snap-tie leaks in poured concrete
• You want the leak stopped without excavation
• Structural cracks needing strength restoration — those get epoxy injection once dry and stable
• Block, brick and stone foundations — pressure injection doesn’t suit hollow-core construction
• Wall failure symptoms (horizontal cracks, bowing) — assessment first
| Hydrophobic polyurethane | Hydrophilic polyurethane | |
|---|---|---|
| Reaction with water | Repels water after cure; needs only trace moisture to kick | Absorbs and binds with water while curing |
| Expansion | High (up to ~20×) | Moderate |
| Cured form | Closed-cell foam, unaffected by wet/dry cycles | Flexible gel-like seal; superior bond to wet concrete |
| Shrinkage risk | Minimal in dry spells | Can shrink if the crack fully dries long-term |
| Typical residential use | Foundation cracks with intermittent water | Constantly wet cracks, moving joints |
For most GTA foundation cracks — wet in spring, dry in August — a closed-cell hydrophobic foam is the durable choice, and it’s what we quote unless conditions say otherwise.
We confirm the leak source is the crack — not grading, window wells, or the cove joint — so you fix the right thing.
Ports every 6–12″, face sealed.
Resin meets the water and expands, driving foam through the full depth and every branch.
Ports off, wall dressed, paintable same day.
Certificate issued — it transfers on sale.
A Toronto foundation goes through dozens of freeze–thaw cycles each winter while expansive clay soil swells and shrinks around it. Rigid patches and hydraulic cement fail here precisely because the wall moves. Cured polyurethane foam flexes with that movement — which is why it’s the standard leak-seal material in this climate, and why we can inject in February as easily as July: the work happens from your heated basement.
Quoted separately: drywall access and restoration, multiple cracks, window-well or cove-joint work (different fixes).
Not every basement leak is a jagged crack. Poured walls have predictable weak points — the cold joint where two pours meet, and the small round tie-rod holes left by the original formwork. Both are sealed with the same water-activated injection approach, typically $75–$150 per tie-rod hole, and both are checked as part of the free assessment so nothing gets missed.
As long as it’s:
Polyurethane injection with same-region crews — see your city’s page for local specifics.
The decision, in plain terms, with the cases where each one is wrong.
How the resin behaves in a wet crack, and why water is the catalyst.
While it’s still leaking. Free written assessment · one-visit repair · transferable lifetime warranty.
Live Google reviews for Concrete Crack Repair Pros, pulled straight from our own Google Business Profile at 64 Millwick Dr, North York. Nothing on this page is written by us, and nothing is borrowed from a sister company.
