Crack Foundation & Concrete Slab Repair
Detailed Description
Foundation Cracks in Toronto & GTA Homes Get Worse Every Winter — Not Better
A crack in a Toronto & GTA home’s foundation or basement slab that looks stable in September will be wider in March. Toronto & GTA’s freeze-thaw cycles — soil heaving, water infiltration, and expansion — apply continuous stress to foundation concrete that causes existing cracks to propagate. What starts as a hairline crack that doesn’t leak becomes a 3mm crack that allows water seepage. What was a 3mm crack becomes a 6mm crack that allows significant water infiltration. The progression is predictable, and the cost of repair at each stage is significantly higher than at the previous one.
At CNG Contracting, foundation and concrete slab crack repair in Toronto & GTA uses the correct method for the crack type — epoxy injection for structural cracks requiring strength restoration, polyurethane foam injection for active water-leaking cracks, and surface sealing for non-structural surface cracks. The right method for each crack, assessed individually. Not a single approach applied to all situations because it’s easier to explain.
Crack Repair Methods We Use in Toronto & GTA Homes
- Epoxy Injection: For structural cracks in Toronto & GTA foundation walls where restoring concrete tensile strength is the objective — rigid epoxy fills and bonds the crack, restoring near-original structural continuity.
- Polyurethane Foam Injection: For active water-leaking cracks where flexibility is needed — polyurethane expands on contact with water, fills the crack completely, and remains flexible to accommodate minor ongoing movement.
- Surface Sealing: For non-structural surface cracks in garage and basement slabs — proper preparation and sealant application that prevents water infiltration without structural repair requirements.
- Crack Classification: We assess every crack for type, width, activity (static vs. growing), and water infiltration status before recommending any repair method — the assessment determines the approach.
Why Toronto & GTA’s Climate Accelerates Foundation Crack Progression
- Freeze-thaw cycles widen existing cracks by expanding water that has entered them
- Clay-heavy GTA soils expand when wet and contract when dry — applying cyclic stress to foundation walls
- Spring thaw delivers the highest water pressure against Toronto & GTA home foundations
- Road salt used near Toronto & GTA properties accelerates surface concrete deterioration
Foundation cracks repaired early in your Toronto & GTA home cost a fraction of what they cost after the damage progresses. Book your assessment today.
Service Details
| Includes | Crack classification, method selection, injection or surface repair, written findings |
| Time on site | 1 to 4 hours depending on crack count and type |
| Warranty | 2 years on workmanship |
| Licensed & insured | Yes |
| Service area | Toronto & GTA and surrounding GTA |
Frequently Asked — Foundation Crack Repair in Toronto & GTA
How do I know if a foundation crack in my Toronto & GTA home needs immediate attention?
Horizontal cracks, cracks with visible displacement between the two sides, cracks that are actively leaking water, and cracks wider than 6mm warrant prompt assessment. Hairline cracks along vertical or diagonal lines are common in poured concrete foundations and often stable — assessment determines appropriate action.
Can foundation cracks be repaired from the interior in Toronto & GTA homes?
Yes — injection repair from the interior is the standard approach for most Toronto & GTA foundation wall cracks. Interior access is more practical and less disruptive than exterior excavation in most situations. We assess the specific crack and advise on the best repair approach.
How do I book foundation crack repair in Toronto & GTA?
Book online in under two minutes. Our Toronto & GTA team contacts you directly to schedule.
Foundation crack documentation for Toronto & GTA homeowners includes photographs and written descriptions before and after repair — useful records for understanding whether a crack is actively changing over time and for providing to insurance or future property assessors.
Book Your Toronto & GTA Home Service With CNG Contracting
CNG Contracting has been serving Toronto & GTA and the GTA since 2005. Every service is performed by licensed and insured professionals with the experience to do the job correctly the first time. Our 2-year workmanship warranty means that if anything we’ve done doesn’t meet the standard we committed to, we come back. Book online in under two minutes — our Toronto & GTA team contacts you directly to confirm details and schedule at a time that works for your household. The right service, the right way, on your schedule.
Why is a Technical Visit necessary?
Not all cracks are created equal. A "hairline" crack might be simple shrinkage, but a horizontal crack in a foundation wall could indicate serious hydrostatic pressure or structural failure. Using a simple tube of caulk from a hardware store is a temporary band-aid that doesn't stop water pressure. Our Crack Foundation & Concrete Slab Repair assessment measures the width and depth of the crack to determine if it needs low-pressure epoxy injection (for strength) or flexible polyurethane foam (to stop water leaks).
SCHEDULE AN INSPECTION
Request your technical visit.
Tell us what you need and a certified specialist will visit you to evaluate your project and give you a real quote the same day.
WHY DO I NEED A TECHNICAL VISIT?
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1Real diagnosis in your home. A technician evaluates materials, measurements, access, and local regulations.
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2The visit cost is discounted from the project. The fee is fully credited to your final invoice once you approve the quote.
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3No commitment if you don’t approve the quote. If you don’t accept the quote after the visit, there is no obligation to proceed.
- Certified technicians — licensed & insured
- Real quote — same day as the visit
- No surprises — no hidden costs
Talk to an expert
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