Basement Foundation Crack Repair in Toronto

Our primary repair method is low-pressure crack injection, which fills the crack from the inside surface all the way through to the exterior soil side. For non-structural cracks that are actively leaking, we use flexible polyurethane injection resin — it reacts with water, expands to fill voids and irregular crack paths, and remains flexible to accommodate minor seasonal movement. For structural cracks where we need to restore the wall’s load-bearing capacity, we use structural epoxy resin that cures harder than the surrounding concrete, effectively welding the crack shut. The Ontario Building Code (Section 9.13) requires that foundation walls resist both water penetration and lateral soil pressure, and our repairs are designed to meet or exceed those requirements.

What many homeowners don’t realize is that crack repair is often just the first step. If the underlying cause isn’t addressed — poor exterior grading, failed weeping tile, or excessive hydrostatic pressure from Toronto’s high water table near Lake Ontario — new cracks will eventually form elsewhere. During every crack assessment, we evaluate the root cause and recommend a complete solution. Sometimes that’s as simple as regrading the soil away from the foundation; other times it involves interior waterproofing or sump pump installation to manage water pressure.

We also see a growing number of homes with horizontal or stair-step cracks in cinder block foundations — these are structural concerns that require more than injection. In these cases, we may recommend carbon fiber strap reinforcement or steel beam bracing to stabilize the wall before it bows further. Every crack we repair comes with a written warranty, and we document the crack type, cause, and repair method so you have a complete record for insurance and resale purposes.