Do you need foundation cracks repairs?

Pyrite is an iron sulphide, known as “fool’s gold” whose crystallization shimmers with gilded reflections. If the brilliance of this worthless mineral deceived gold prospectors of their time, its oxidization when in contact with moisture and oxygen, producing sulfuric acid, stirs up a bitterness in many owners today. The presence of pyrite or of pyrrhotite underneath a foundation may cause the slab of concrete of the house to rise and crack.

In Canada, the cost to repair a foundation crack generally ranges from $500 to $1,500 for an interior polyurethane or epoxy injection. If the situation requires exterior work, including excavation and waterproofing membrane installation, the cost is usually closer to $3,000 to $5,500 per crack. Prices vary depending on the depth and severity of the crack, site accessibility, soil conditions, and how urgent the repair is before freeze-thaw cycles worsen the damage.

To repair a foundation crack in Canada in 2026, the most reliable long-term solution is exterior waterproofing with an elastomeric membrane—specifically designed to withstand the country’s harsh freeze-thaw cycles and diverse soil conditions. When exterior access isn’t feasible, interior injection using polyurethane or epoxy offers a fast, clean, and watertight fix for non-structural cracks. However, if there are signs of structural movement, carbon fibre reinforcement has emerged as the industry standard, providing a durable way to stabilize foundations without the need for extensive excavation.