How long does injection repair take?

Most single-crack repairs are completed in a few hours.

Will the crack come back?

A properly injected crack is permanently sealed — it won't reopen at the same location under normal conditions.

What if the crack is a sign of a bigger structural issue?

If our inspection finds signs of structural movement, we'll explain what we're seeing and discuss structural foundation repair (see our Structural Foundation Repair page) rather than just injecting a crack that's a symptom of a larger problem.

Foundation Crack Repair in Windsor, ON | Rose City Waterproofing

What It Is

Most residential foundation cracks are non-structural (shrinkage cracks that form as concrete cures) but still let water in over time. We repair them with polyurethane or epoxy injection — a low-viscosity resin is injected directly into the crack under pressure, filling it completely from the inside out, including any hairline branches a surface patch would miss. Polyurethane is typically used for actively leaking cracks (it expands and stays flexible), while epoxy is used where structural bonding strength matters more than water-sealing flexibility. We'll tell you which applies to your situation during the free inspection.

Why Injection (vs. a surface patch)

A surface patch (hydraulic cement smeared over the visible crack) only addresses what's visible on the surface — water pressure behind the wall (hydrostatic pressure) will often find its way around or through a surface patch over time. Injection fills the entire depth of the crack, which is why it holds up long-term rather than needing to be redone in a year or two.

Signs You Need This

A visible crack in a poured concrete foundation wall, especially one that's damp or actively dripping
A crack that seems to widen slightly after heavy rain
A previous surface patch that's failed or is leaking again
Efflorescence tracking specifically from one crack location

Our Step-by-Step Installation Process

Free inspection

We assess the crack's width, direction, and whether it shows any signs of being structural (stair-step pattern, horizontal cracking, noticeable width) rather than a simple shrinkage crack.

Injection

The appropriate resin (polyurethane or epoxy) is injected directly into the crack under pressure until it's fully filled, sealing it from the inside — not just patched over the surface.

Cure & test

The repair cures and is inspected to confirm the seal is complete.

Warranty

Written warranty on the repaired section.

Frequently Asked Questions: Foundation Crack Repair

Vertical, hairline cracks are usually shrinkage cracks and not structural — stair-step patterns, horizontal cracks, or cracks wider than about 1/4 inch can indicate a structural issue and should be inspected before assuming it's a simple fix. We'll tell you honestly which applies to your wall.

Foundation Crack Repair Windsor Homeowners Trust