Epoxy Injection in Toronto

It’s important to understand when epoxy injection is the right choice versus polyurethane injection. Epoxy is a rigid, structural adhesive — it’s the correct choice when the crack has compromised the wall’s structural capacity or when a permanent, rigid seal is needed. Polyurethane foam, by contrast, is flexible and expands to fill voids — we use it for actively leaking cracks where water is flowing during the repair, or for non-structural cracks where some flexibility is desirable to accommodate minor foundation movement. In practice, about 60% of the cracks we repair in Toronto homes get epoxy and 40% get polyurethane. We assess each crack individually and recommend the appropriate material — never a one-size-fits-all approach.

Our injection process uses low-pressure port injection, which is the method recommended by the American Concrete Institute (ACI 224) and the International Concrete Repair Institute (ICRI). We install T-shaped injection ports at 6-to-8-inch intervals along the crack using a high-strength epoxy paste as both adhesive and surface seal. Starting from the lowest port, we inject resin at controlled pressure (20-40 PSI) until it flows from the next port up, then cap and move up. This bottom-to-top technique ensures the crack is filled completely with no air pockets. For basement wall cracks that extend below the floor slab, we can extend the repair using angled drilling to reach the hidden portion.

One question homeowners always ask is whether injected cracks will crack again. The honest answer: the epoxy-filled section will not crack — it’s now the strongest part of the wall. However, if the underlying cause of the crack hasn’t been addressed (for example, ongoing hydrostatic pressure from failed drainage, or structural settlement from poor soil bearing), a new crack can form adjacent to the repair. That’s why we always assess the root cause during our inspection. If we see signs of ongoing movement — stepped cracks in block walls, doors and windows that have shifted, or multiple parallel cracks — we’ll recommend addressing the structural issue before or alongside the injection. We warranty our epoxy injections for the lifetime of the structure.