Foundation Crack Repair

Laval's unique geological profile — characterized by marine clay deposits left by the Champlain Sea — makes foundations especially susceptible to cracking. As seasons change, the soil expands when wet and contracts during dry periods, exerting cyclical pressure against your foundation walls. Quebec's extreme freeze-thaw cycling (often 40–60 freeze-thaw events per year) further accelerates this movement, opening hairline cracks into serious structural defects over time.

Not all foundation cracks are created equal. Vertical cracks are typically caused by concrete curing shrinkage or minor settlement and are usually non-structural, but they are a direct pathway for water infiltration. Horizontal cracks are the most serious — they indicate lateral soil pressure pushing inward against the wall and may signal imminent wall failure. Diagonal or stair-step cracks usually point to differential settlement, where one section of the foundation sinks faster than another.

Homeowners in Chomedey, Vimont, Duvernay, Sainte-Rose, and Fabreville regularly contact us about new cracks appearing after spring thaw. In most cases, early intervention with professional epoxy or polyurethane injection prevents hundreds of hours of water damage and mold remediation downstream.

The two primary injection methods for foundation crack repair are epoxy resin injection and polyurethane foam injection. Each has specific applications where it excels.

Epoxy injection is ideal for structural cracks in dry or slightly damp conditions. Epoxy cures to a compressive strength exceeding that of the surrounding concrete, effectively making the repaired crack stronger than it was originally. It bonds the two sides of the crack together, restoring full structural continuity. This method is preferred for load-bearing walls with structural cracks that need reinforcement.

Polyurethane foam injection is the superior choice for actively wet or leaking cracks. The foam expands on contact with moisture, filling the void completely and creating a flexible, waterproof seal. It accommodates minor ongoing movement without re-cracking, making it excellent for Laval's dynamic soil conditions. For most residential foundation cracks in Auteuil, Pont-Viau, and Laval-des-Rapides, polyurethane foam is the go-to solution.

Our technicians assess each crack individually — measuring width, depth, moisture level, and crack pattern — before recommending the most appropriate injection method. Many projects require both materials applied strategically across different sections.

A single unrepaired foundation crack may seem minor initially, but the downstream costs compound quickly. Water infiltrating through a crack creates ideal conditions for black mold growth, which can spread throughout wall cavities and HVAC systems, triggering expensive remediation projects. Chronic moisture also degrades concrete over time through a process called freeze-thaw spalling, where water absorbed into the concrete expands during winter and physically breaks the surface apart.

Beyond moisture damage, unrepaired cracks can widen progressively due to ongoing freeze-thaw pressure, eventually requiring full wall replacement instead of simple injection repair. In homes throughout Sainte-Dorothée, Saint-François, and Laval-Ouest, we frequently see situations where a $600 crack injection would have prevented a $12,000 waterproofing and reconstruction project.

All our crack repair work is backed by a transferable written warranty. We also address the root cause — whether drainage improvement, downspout extension, or soil grading — to prevent recurrence.