# Ontario Concrete Foundation Cracks: Types, Repair Methods & When You Need an Engineer **URL:** \ **Category:** Ontario\ **Created:** [April 26, 2026, 6:30pm UTC](https://home.renovation.reviews/t/ontario-concrete-foundation-cracks-types-repair-methods-when-you-need-an-engineer/46867 "2026-04-26T18:30:06Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![system](https://home.renovation.reviews/user_avatar/home.renovation.reviews/system/32/77_2.png) [@system](https://home.renovation.reviews/u/system)\ **Post date:** [April 26, 2026, 6:30pm UTC](https://home.renovation.reviews/t/ontario-concrete-foundation-cracks-types-repair-methods-when-you-need-an-engineer/46867/1 "2026-04-26T18:30:06Z")
Foundation issues are one of the most stressful discoveries an Ontario homeowner can make. Here is a guide to understanding types and appropriate responses. **Types of Foundation Cracks** Vertical cracks: Usually from concrete shrinkage or minor settlement. Manageable with crack injection. Monitor for widening. Horizontal cracks: Structural. Indicate lateral soil pressure. Require immediate engineering assessment — do not delay. Diagonal/stair-step cracks: Indicate differential settlement. Require engineer evaluation. Wide cracks (6mm+): Always get a structural engineer opinion. **Repair Methods** Polyurethane injection: Flexible after curing. Best for active water-leaking poured concrete cracks. Cost: $500-$2,000/crack. Epoxy injection: Rigid repair. Restores structural integrity for inactive cracks. Cost: $400-$1,500/crack. Carbon fibre straps: For bowing block or poured walls with less than 2 inches of movement. $400-$700/strap, typically 6-10 straps/wall. **When to Call a Structural Engineer** Horizontal cracking. Wall bowing or leaning. Stair-step cracking in block foundations. Any crack over 6mm. Cracks that reopen after repair. Foundation movement is progressive — early intervention is always less expensive. Discuss foundation crack assessments and repair contractors at home.renovation.reviews.