Basement wall cracks are nothing new to Ontario homeowners. Our soil, freeze-thaw cycles, and unpredictable weather create the perfect recipe for foundation cracks. Left unchecked, these small lines can grow into big headaches: water leaks, mould growth, and even structural issues.
When it comes to basement crack repair, the two main methods are epoxy injection crack repair and polyurethane crack injection. Both are effective, but each has its own strengths depending on the type of crack and the conditions around it.
So, which is right for your home? That’s where things get a little tricky, and where this guide steps in. We’ll walk you through the differences, compare epoxy vs polyurethane for basement repair, and show you how Gamcon’s expertise ensures your foundation is sealed tight against leaks.
But first, let’s highlight what you’ll walk away with from this guide:
Key Takeaways
- Not all foundation cracks are created equal; some are structural, others are just letting water sneak in.
- Epoxy injection is best for dry, structural cracks that need strength restored.
- Polyurethane injection shines when dealing with wet, leaking cracks, thanks to its foam expansion.
- DIY repair kits often fall short; professional foundation crack repair ensures long-lasting results.
- Gamcon offers tailored basement waterproofing Ontario solutions backed by warranties.
Why Basement Crack Repair Matters
Cracks often start small, caused by natural settlement, hydrostatic pressure, basement buildup, or seasonal freeze-thaw cycles. At first, they might look harmless, but over time, they can:
- Let in water that leads to mould and mildew.
- Weaken your concrete foundation repair efforts.
- Compromise the structural integrity of your home.
Ignoring a crack is like ignoring a leaky roof. It may hold out for a while, but when it fails, it fails big. That’s why timely foundation waterproofing services matter.
Gamcon has worked with countless homeowners in Ontario, and we know firsthand how local soils and heavy rains can put pressure on basement walls. The sooner you act, the easier and less costly the repair.
Understanding Crack Types Before Repair
Before deciding on epoxy or polyurethane, it’s important to know what type of crack you’re dealing with:
- Structural cracks: These often form in wider, deeper lines and can signal movement or stress in the foundation.
- Non-structural cracks: Usually hairline or vertical, these are more about water infiltration than stability.
Not sure which you’ve got? That’s where a professional inspection comes in. Gamcon’s specialists identify the root cause so we can recommend the right solution instead of just patching symptoms.
Want to learn more? Visit our guide on How to Fix a Basement Leak | Step-by-Step Repair Guide or explore the Best Waterproofing Method for Basements.
Epoxy Injection for Basement Crack Repair
Epoxy injection crack repair is like giving your foundation a permanent weld. This material seeps into cracks and cures into a rigid, high-strength bond that essentially glues the wall back together.
Best suited for:
- Dry cracks where water infiltration isn’t active.
- Cracks that threaten the structural integrity of the foundation.
Benefits of epoxy injection:
- High bonding strength meeting ASTM C881 / C882 standards.
- Long-lasting results for stable cracks.
- Restores structural strength to walls.
When epoxy isn’t ideal: if the crack is actively leaking, epoxy may not adhere properly. It’s rigid, so if your foundation is still shifting, the bond may fail.
Polyurethane Injection for Basement Crack Repair
Now, let’s talk about the flexible workhorse of leaking basement repair: polyurethane.
Polyurethane injection involves injecting liquid resin that expands up to 10–30 times its original volume. As it foams, it fills voids, seals water pathways, and adapts to the natural movement of your foundation.
Best suited for:
- Cracks with active leaks.
- Damp or wet environments where epoxy would fail.
Benefits of polyurethane injection:
- Works even on wet surfaces.
- Flexible enough to handle ongoing foundation shifts.
- Effectively seals water entry points.
Types of polyurethane:
- Hydrophilic polyurethane foam: attracts water, great for sealing fine cracks.
- Hydrophobic polyurethane foam: repels water, ideal for larger voids and long-term waterproofing.
Epoxy vs Polyurethane: Which is Best for Your Basement?
Choosing between the two comes down to one simple question: Is the crack structural or leaking?
Here’s a quick side-by-side:
| Feature | Epoxy Injection | Polyurethane Injection |
| Best Use Case | Dry, structural | Wet, leaking |
| Crack Type | Structural, stable | Leaking, moving |
| Flexibility | Rigid | Flexible |
| Cure Time | Hours | Minutes |
| Cost | Moderate | Slightly higher |
| Longevity | Excellent if stable | Excellent if leaks persist |
Still unsure? That’s where professional advice makes all the difference.
When DIY Basement Crack Repair Isn’t Enough
You’ve probably seen those DIY kits at hardware stores. Tempting, right? They promise a quick fix, but here’s the reality:
- Kits often fail to penetrate the entire crack.
- Using the wrong injection material can make leaks worse.
- Without proper sealing, water finds its way back in.
DIY might save you a few bucks upfront, but in the long run, it’s like patching a leaky boat with duct tape. That’s why foundation crack repair is best left to pros like Gamcon.
Gamcon’s Professional Basement Crack Repair Process
Here’s how Gamcon handles basement wall crack sealing with precision:
- On-site inspection to identify the crack type and source.
- Selecting epoxy or polyurethane based on conditions.
- Low-pressure crack injection for complete coverage.
- Sealing, curing, and testing to ensure water can’t get back in.
We use specialized tools, tested materials, and a workflow proven to last. It’s a process backed by certifications and years of hands-on experience in basement waterproofing Ontario.
Costs, Warranties & Long-Term Solutions
So, how much does it cost? On average, basement crack repair ranges from $80 to $150 per linear foot, depending on factors like:
- Crack length and width.
- Moisture levels.
- Foundation condition.
Gamcon offers warranty-backed solutions so you’re not left worrying whether the repair will hold. Our goal isn’t just fixing today’s leak; it’s giving you peace of mind for years to come.
For a deeper dive into costs, check out Basement Waterproofing Cost in Toronto (2025): What Homeowners Should Expect.
Why Choose Gamcon for Basement Crack Repair in Ontario
Gamcon isn’t just another contractor. We’re your neighbours in Toronto, working to keep basements across Ontario dry and structurally sound. From foundation waterproofing services to tailored injection repairs, we’ve seen it all and fixed it all.
What sets us apart:
- Proven expertise with Ontario’s unique soil and weather.
- Certified techniques and warranty-backed results.
- Friendly service that puts your peace of mind first.
Don’t just take our word for it; our customer testimonials and before-and-after photos speak volumes.
Protect Your Home from Water Damage; Book a Free Consultation Today!
Foundation cracks may be inevitable, but water damage doesn’t have to be. With the right choice between epoxy vs polyurethane basement repair, you can stop leaks in their tracks and restore confidence in your home’s stability.
Whether you’re dealing with a hairline crack or a full-on leak, Gamcon is here to help. Book your free basement crack repair consultation today and let us keep your foundation strong, dry, and worry-free.
Need expert advice on your basement crack repairs? Contact GAMCON today to discuss your project needs and get tailored solutions from experienced professionals. GAMCON is your top choice for basement waterproofing in Toronto and the GTA. We’re not just another construction company; we’re a team of skilled specialists with a shared passion for creating the unseen foundations that make Toronto’s buildings stand tall. Whether you are planning a residential or commercial project, we have a solution, even if the space, soil conditions or complexity are demanding.
Call GAMCON today at (416) 888-4188 or complete our convenient online form to learn how we can help you create a strong foundation.
FAQs
Which is better: epoxy or polyurethane for basement crack repair?
Neither is better in all cases; epoxy is best for structural cracks, polyurethane for active leaks.
How long does epoxy last?
If applied correctly to a stable crack, epoxy can last decades.
Can polyurethane fix active leaks?
Yes, that’s its specialty. Polyurethane works even in wet conditions.
Can I inject both materials into the same crack?
In some cases, yes. Professionals sometimes combine methods for maximum effectiveness.
How much does professional crack repair cost?
Typically between $80–$150 per linear foot, but it depends on severity and conditions.
