# Foundation Crack Repair Toronto | Basement Flood Toronto URL: https://basementfloodtoronto.ca/foundation-crack-repair-toronto/ No Excavation // Priced Per Crack # Basement Flood Toronto: Foundation Crack Repair, Polyurethane Injection & Structural Epoxy for Residential & Commercial By The Basement Flood Toronto Crew [/about/#the-basement-flood-toronto-crew →](/about/#the-basement-flood-toronto-crew) Last updated: September 24, 2026 Foundation crack repair in Toronto is the interior polyurethane injection of leaking poured-concrete basement cracks, sealing the crack through the full wall thickness from inside for $500-$1,500 CAD per crack, with no excavation and a written workmanship warranty. Most leaking foundation cracks do not need a backhoe. They need the right material pushed all the way through the wall from inside. We tell you which cracks matter, fix the ones that leak, and are straight with you when a crack is structural and needs an engineer instead. 24/7 Emergency Call (647) 277-6993 [tel:+16472776993 →](tel:+16472776993) See CAD Scope Bands [#costs →](#costs) - 18 Years GTA Basement Flood Response - IICRC WRT, ASD, AMRT, CDS Certified - 24/7 Dispatch, 90-Minute Response - Insurance Direct-Billing, Subject to Policy Limits ![Two technicians injecting polyurethane through ports into a leaking vertical crack in a poured concrete basement wall](/images/misc/two-technicians-injecting-hydrophobic-polyurethane.webp) Published Range // Foundation Crack Repair CAD From $500 CAD per crack Full bands [#costs →](#costs) - 18 Years of Basement Flood Response - IICRC WRT, ASD, AMRT, CDS Certified - 24/7 Dispatch, 90-Minute Response - Insurance Direct-Billing - 5-Star Customer Satisfaction - WSIB + $5M Pollution Liability ## What Foundation Crack Repair Involves Do you feel a sense of dread every time you spot a new crack creeping up your basement wall? Dealing with a damp basement, or worse, a full basement flood in Toronto [/ →](/) , is a frustrating experience for many homeowners and business owners. Providing reliable Foundation Crack Repair Toronto services is what we do best. The good news is that a single leaking crack in a poured foundation rarely requires a massive, yard-destroying excavation. We inject advanced, flexible **hydrophobic polyurethane** resins like SikaFix right through low-pressure **injection ports**. This specialized material expands rapidly to seal the crack completely through the wall. Our experts take the guesswork completely out of your repair project, so you will always know when a crack is structural and requires an engineer. Sometimes wall-wide seepage means full waterproofing is a smarter call. Most Toronto houses built from the 1950s onward sit on a **poured concrete foundation**. Local Halton Till clay soils cause immense frost heave pressure during freezing winters. Poured walls almost always develop a few cracks as the concrete cures, shrinks, and fights against that shifting clay. You will typically see water enter through three specific weak points: - **The hairline shrinkage crack:** This is the absolute most common issue you will encounter. - **A tie rod leak:** This happens where the steel rods that held the concrete forms rust and let water follow them right inside. - **A cold joint:** This is another common culprit, which occurs exactly where two separate concrete pours meet. ![Two technicians inspecting and measuring a foundation crack width with a crack gauge in a Toronto basement](/images/content/two-technicians-measuring-a-basement-foundation-cr.webp) ## Hairline vs Structural Cracks: The 3-Question Test Before You Panic Most cracks are simply not a sign that your building is failing. You can run through these three simple questions before you start to worry. 1. **How wide is it, and is it even?** Hairline to about 6 mm, and the exact same width from top to bottom, usually indicates normal shrinkage. A crack that is wider at one end, or wider than 6 mm, deserves a much closer look. 2. **Are the two sides level with each other?** Check if one side of the crack is pushed in further than the other. This means the wall has moved, which is called displacement and requires a structural engineer. 3. **Is it growing, and is anything else changing?** Mark the ends with a pencil and the current date. Watch for sticky doors or sloping floors upstairs, as lengthening over the months means you absolutely need a structural assessment. If all three answers point to a stable hairline crack that leaks, injection is usually the perfect fix. Any answer that raises a red flag means you need professional guidance. We recommend an engineer first for any signs of structural movement. The engineer might suggest specialized reinforcement like Rhino **carbon fibre staples** before any sealing happens. These specific staples provide incredible tensile strength across the repaired crack to prevent future shifting. ## Types of Crack Repair ### Polyurethane injection for leaks Flexible, water-activated resin fills the entire crack from the inside face all the way to the soil side. The material reacts with moisture to form a tight, permanent gasket. Our technicians use this as the standard repair for leaking poured concrete walls. Polyurethane stays flexible enough to handle the natural thermal movement of your home throughout the freezing and thawing seasons. ### Structural epoxy for bonding **Structural epoxy** bonds the two sides of a completely dry crack back together. This specialized material, such as 4121 Carbon Fiber Epoxy, cures rigid and incredibly strong. Our approach uses epoxy where the main goal is restoring structural strength rather than just stopping water. This method effectively welds the broken concrete back into a single solid piece. ### Parging and sealant Fixing exterior surface cracking and failed cement coatings requires a different approach. **Parging** and sealant ($2,000-$5,000 CAD) repair the outside face of the wall to block the elements. We strongly suggest checking out our guide on basement waterproofing [/basement-waterproofing-toronto/ →](/basement-waterproofing-toronto/) to understand exactly when this exterior approach makes the most sense. A smooth parge coat provides a clean look and a solid first line of defense against rain. ### Block foundations A **concrete block foundation** features hollow cores that will simply swallow any injected resin. This makes interior injection completely useless for this specific building style. Our experts find that block walls are usually much better served by an interior drainage system or a full exterior membrane. Trapped water inside those hollow blocks needs a clear path to drain away safely. ## Why Homeowners Assume Every Crack Means Digging Up the Yard Many people panic when they spot wall damage. There are a few common myths that cause unnecessary stress. - **“Another company said we need full excavation.”** Excavation gets quoted far more often than it is actually needed. Interior injection is the proven, much cheaper fix for one or two leaking cracks in a sound poured wall. We will gladly show you exactly why this works, crack by crack. - **“I’ll just fill it with hydraulic cement.”** **Hydraulic cement** only seals the inside surface and often fails within a single season because it cannot flex. A rigid patch placed on a crack experiencing normal thermal movement will simply break right alongside the concrete. Water keeps moving through the void behind the patch and eventually comes out somewhere else. - **“If one crack leaks, the whole foundation must be bad.”** This is usually not true at all. Shrinkage cracks are completely normal in poured walls. A leak through one isolated crack says a lot more about poor groundwater and bad grading than it does about your structural strength. - **“Cracks mean my house will fail an inspection.”** A repaired crack with a written warranty and clear photos is a much better story for a buyer’s inspector than an unrepaired leaking one. Buyers want to see that maintenance was handled properly. If water is also coming up through the cove joint where the floor meets the wall, you might need a different solution. Adding a sump pump system [/sump-pump-installation-toronto/ →](/sump-pump-installation-toronto/) or an interior drainage channel may be a big part of the final answer. > You deserve a dry, safe basement without paying for unnecessary outdoor digging. Our priority is helping you make the most informed decision for your property. Book a crack assessment. Written scope in 24 hours, and hairline leaks are usually injected inside a week. CAD Field Tariffs // Published Before You Call ## Foundation Crack Repair Cost in Toronto, Per Crack in CAD Injection is priced per crack, and most leaking cracks fall between $500 and $1,500 CAD. Length, access and whether the wall is finished decide where your crack lands. Published Scope Bands per crack Basement Crack Injection (interior polyurethane, per crack) $500 - $1,500 CAD Foundation Parging and Sealant $2,000 - $5,000 CAD Interior Weeping Tile (if leaks are wall-wide) $3,000 - $8,000 CAD What Moves the Price Cost Factors - Crack length A short tie-rod leak is at the bottom of the band. A floor-to-ceiling crack needs more ports and material. - Finished wall access We open only a narrow strip of drywall along the crack, and that removal and patch are listed separately. - Poured or block foundation Injection works on poured concrete. Block walls usually need a different fix, such as parging or drainage. - Structural concerns Wide, displaced or growing cracks may need an engineer's assessment and reinforcement such as carbon fibre staples. Every quote itemises emergency fee, extraction, drying, cleanup, and permanent solution separately. Dispatch fee waived on same-visit extraction. Insurance direct-billing available on covered claims, subject to policy limits and adjuster approval. Incident Timeline // Protocol Sequence ## How Interior Polyurethane Crack Injection Seals a Wall From the Inside Injection works because the resin travels all the way through the wall to the soil side. These are the steps that make sure it does. 1. STEP 01 ### Assess the crack Width, length, displacement, water activity and wall type are recorded. We confirm it is a leak crack, not a structural problem. 2. STEP 02 ### Clean and prepare The crack is cleaned of paint, efflorescence and loose material so the surface seal bonds and ports sit tight. 3. STEP 03 ### Set ports and seal Injection ports are set along the crack at short intervals and the face is sealed so resin is forced inward, not out. 4. STEP 04 ### Inject from the bottom up Hydrophobic polyurethane is injected at low pressure, port by port from the bottom, until it appears at the next port. It reacts with water and expands to fill the crack. 5. STEP 05 ### Cure, finish and warranty Once cured, ports are removed and the surface ground smooth. You get a written workmanship warranty for the repair. Typical visit: 2-3 hours per crack Risk Reversal // Before Any Equipment Goes Down IN WRITING ## Foundation Crack Repair: Price Confirmed Before We Start, Warranty After We Finish This job is priced inside the published CAD bands above, itemised before equipment goes down, and closes with a written workmanship warranty. Insurance-covered claims are billed directly to your insurer, subject to policy limits and adjuster approval. Call (647) 277-6993 [tel:+16472776993 →](tel:+16472776993) Short Intake Form [#dispatch-form →](#dispatch-form) Technical Specifications // Protocol Integrity ## 6 Reasons Toronto Homeowners Call Us About Leaking Cracks 18 YRS ### 18 Years of Basement Flood Response Experience We have seen what a leaking crack costs once it floods a finished basement, so we fix it properly the first time. 3-QUESTION TEST ### Honest Crack Assessment We tell you which cracks are cosmetic, which leak, and which need an engineer. Often only one needs injecting. NO EXCAVATION ### No Digging Interior injection seals the crack through the wall from inside. Your yard, deck and driveway stay put. PU OR EPOXY ### Right Resin for the Job Flexible hydrophobic polyurethane for leaks, structural epoxy only where bonding the wall matters more than flexibility. PER CRACK ### Per-Crack Pricing $500-$1,500 CAD per crack, published before you call, with drywall access listed separately. IN WRITING ### Written Warranty Every injection comes with a written workmanship warranty and photos of the repair. Field Log // Worksite Documentation ## Foundation Crack Repair Field Log: 4 Moments From Recent GTA Jobs Documentation photos from the kind of work this page describes. Crews of two or more on every job. Before: active leak below the window well Ports set along the crack Resin expanding through the full wall After: dry through the spring thaw Verified Case Dossiers // GTA Residences ## 3 Leaking Cracks Fixed Without a Shovel Joanne B. Wychwood > "One leaking crack by the window well. Polyurethane injection, $850, done in two hours, and it held through the spring thaw." \[COMPLETED\] 1 crack, $850 CAD, 2 hours Luis M. Maple, Vaughan > "They ran the three-question test on our hairline cracks and told us only one needed injecting. $600 instead of the excavation another company quoted." \[COMPLETED\] 1 of 4 cracks injected, $600 CAD Peter H. Lansing, North York > "Two cracks injected and a written warranty for $1,900. Clean work, no mess on the finished side." \[COMPLETED\] 2 cracks, $1,900 CAD, warranty issued FAQ Archive // Operational Guidelines ## 10 Foundation Crack Questions Toronto Homeowners Ask ### How much does foundation crack repair cost in Toronto? Interior polyurethane crack injection runs $500-$1,500 CAD per crack. A short leak around a tie rod or a small vertical crack sits near the bottom of the band. A long crack running from floor to ceiling, or one that needs a strip of drywall opened in a finished basement, sits near the top. If the wall has several leaking cracks or water is coming through the whole wall rather than a crack, parging ($2,000-$5,000 CAD) or interior weeping tile ($3,000-$8,000 CAD) may be the better value, and we will say so. You get the per-crack price in writing after we look at each crack, and drywall removal and patching are listed as their own line. ### Is my foundation crack structural? Most basement cracks in Toronto poured foundations are shrinkage cracks that form as concrete cures. They are usually vertical or slightly diagonal, hairline to a few millimetres wide, and do not move. We use a simple three-question test: Is the crack wider than about 6 mm, or wider at one end than the other? Are the two sides offset, with one side pushed in further than the other? Has it grown since you first noticed it, or are there sticking doors and sloping floors upstairs? If the answer to all three is no, it is very likely a leak problem, not a structural one. If any answer is yes, we recommend a structural engineer's assessment before any sealing. ### Polyurethane or epoxy: which is right for my crack? For a leaking crack, hydrophobic polyurethane. It stays flexible, reacts with water, expands to fill the crack through the full wall thickness, and tolerates the small seasonal movement every foundation has. Structural epoxy bonds the concrete back together and is stronger, but it is rigid, and it needs a dry crack. It is used where restoring strength matters more than stopping water. Most leaking basement cracks call for polyurethane. ### Can you repair a crack behind finished drywall? Yes. We open a narrow strip of drywall along the crack, typically 8 to 12 inches wide, inject from inside, and patch the drywall after. That removal and patch are listed separately on the quote. ### Does crack injection work on block foundations? Not well. Concrete block walls have hollow cores, so resin fills the cores instead of sealing the crack. Leaks in block foundations usually need exterior membrane, parging or interior drainage. We will tell you this at the assessment. ### How long does crack injection last? A properly injected polyurethane repair is intended to last the life of the wall under normal conditions, and it comes with a written workmanship warranty. If the foundation moves significantly, a new crack can form, which the warranty terms explain. ### Will injection replace exterior waterproofing? For one or two leaking cracks in a sound poured wall, often yes. For water coming through many cracks, the cove joint or the whole wall face, no. That is a drainage problem, and basement waterproofing is the right fix. ### Why is my crack only leaking in spring? Spring thaw saturates the soil and raises the water table, which pushes water through any path it can find. A crack that is dry in August can leak every March and April. Injecting in any season still seals it, because the resin reacts with moisture in the crack. ### Should I patch it with hydraulic cement myself? Hydraulic cement on the inside face often stops a drip for a season, then fails because it is rigid and only seals the surface. Water keeps moving through the crack behind it. Injection seals the whole depth of the wall. ### Do you repair cracks in Wychwood, Maple and North York? Yes. We inject foundation cracks across Toronto, Etobicoke, North York, Scarborough, Vaughan and Mississauga, including older homes in Wychwood and newer subdivision houses in Maple. Question not covered here? Call (647) 277-6993 [tel:+16472776993 →](tel:+16472776993) / Send a Message [/contact/ →](/contact/) Linked Protocols // Related Field Hubs ## 3 Related Services Homeowners Book Alongside Foundation Crack Repair ![Two technicians laying perforated weeping tile in clear stone along the cut perimeter of a Toronto basement floor](/images/misc/two-waterproofing-technicians-laying-4-inch-perfor.webp) ### Basement Waterproofing $3K - $25K CAD Interior weeping tile, exterior excavation, parging and crack sealing for recurring leaks in Toronto clay soil. View protocol [Basement Waterproofing →](/basement-waterproofing-toronto/) ![Two technicians lowering a new submersible sump pump with a vertical float switch into a lined sump pit](/images/misc/two-technicians-lowering-a-new-submersible-sump-pu.webp) ### Sump Pump Installation Subsidy Ready New pits, pump replacement and battery backup, ESA-compliant wiring and subsidy paperwork filed for you. View protocol [Sump Pump Installation →](/sump-pump-installation-toronto/) ![Two AMRT technicians in respirators inside poly containment removing mould-damaged drywall in a basement](/images/misc/two-amrt-technicians-in-respirators-and-coveralls-.webp) ### Mould Remediation AMRT Standard AMRT containment, HEPA filtration, removal and post-remediation air quality verification, priced by area. View protocol [Mould Remediation →](/mould-remediation-toronto/) ![](/images/misc/two-iicrc-technicians-loading-air-movers-and-lgr-d.webp) Dispatch desk open 24/7 across the GTA ## One Leaking Crack? It Might Be a Two-Hour Fix. A technician checks each crack against the three-question test and gives you a per-crack price in writing, with no digging unless the wall truly needs it. 24/7 Emergency Call (647) 277-6993 [tel:+16472776993 →](tel:+16472776993) Get My CAD Scope [/contact/ →](/contact/) - Emergency fee quoted upfront - Written CAD scope first - 1-5 year written warranty Short Dispatch Intake DISPATCH ACTIVE Request logged The dispatch desk will call you back shortly. For water coming in right now, call (647) 277-6993 [tel:+16472776993 →](tel:+16472776993) . Four fields and the dispatch desk calls you back. Your page is attached so we know which service you were reading about. Need something non-urgent? Send a Message [/contact/ →](/contact/) to our GTA coordination desk.