Are foundation cracks serious?
Hairline cracks are often cosmetic, but horizontal, widening, or stair-step cracks and any bowing signal structural movement and should be assessed promptly. A thin vertical hairline from concrete curing is usually low risk. A crack that is wider at one end, growing, leaking, or running horizontally across a wall is the clay talking, and that needs more than injection.
Why do cracks keep coming back in Winnipeg?
Because the soil keeps moving. Red River Valley gumbo clay swells when saturated and shrinks when dry, heaving and dropping your foundation through every season. Injection seals the crack you have today, but if the wall is still being pushed and pulled by the clay, new cracks form. That is why we look at the whole foundation, not just the one crack, and recommend piering or wall reinforcement when the movement warrants it.
Polyurethane vs epoxy injection
We choose based on whether the crack is leaking, structural, or both, and whether the soil under it is stable.
- Polyurethane: flexible, expands to fill, ideal for actively leaking cracks and stopping water. Tolerates minor future movement.
- Epoxy: rigid and high-strength, welds a structural crack back together when the wall is stable and not moving.
Our process
- Free on-site assessment of the crack and the surrounding foundation.
- We identify whether it is cosmetic, water-related, or structural movement.
- Injection (polyurethane or epoxy), or a structural recommendation if injection alone will not hold.
- Warrantied repair, with clear written terms.
Winnipeg cost for foundation crack repair
| Scope | Typical CAD |
|---|---|
| Single polyurethane injection (poured concrete) | $500 – $900 |
| Multiple cracks or epoxy for structural repair | $900 – $1,500 |
| Crack repair + interior drainage tie-in | $2,200 – $5,500 |
| Exterior excavation + membrane | $4,500 – $12,000 |
Last updated: June 2026. Exact pricing requires an on-site assessment.