# Foundation Crack Repair Toronto | From $500 CAD per Crack

URL: https://foundationwaterproofingtoronto.ca/foundation-crack-repair-toronto/

verified Same-Visit Repair

# Foundation Crack Repair Toronto: Polyurethane and Epoxy Injection

Last updated: October 26, 2026

![Foundation Waterproofing Toronto crew injecting polyurethane into a vertical foundation crack in a Toronto basement](/images/maps/two-crew-members-in-branded-shirts-injecting-polyu.webp)

engineering Polyurethane and epoxy injection, per-crack pricing 3000 PSI INJECTION

**Foundation Waterproofing Toronto**

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 provides basement waterproofing, foundation crack repair, sump pump and backwater valve installation, and interior and exterior weeping tile systems throughout Toronto, ON, backed by 25+ years of experience under Ontario Building Code Part 9.

Foundation Waterproofing Toronto provides foundation crack repair across Toronto and the GTA, sealing leaking poured concrete foundation cracks with low-pressure polyurethane injection for water control and structural epoxy for load-bearing repair. We identify whether a crack is structural or non-structural during the free in-home inspection, quote per crack in CAD, and back the repair with a 10-year written workmanship warranty under Ontario Building Code Part 9, drawing on 25+ years of GTA foundation work.

payments Scope CAD cost anchor

In 2026, polyurethane foundation crack injection runs $500 to $1,200 CAD per crack. Structural epoxy injection is $700 to $1,800 CAD per crack. Crack repair with an exterior membrane after excavation is $2,500 to $6,500 CAD. The in-home inspection is free.

-   check\_circle 25+ years experience
-   check\_circle OBC Part 9 compliant
-   check\_circle Free in-home inspection
-   check\_circle written workmanship warranty on crack injection

calendar\_month Book Free In-Home Inspection

[/contact/ →](/contact/)

 

call Call (647) 254-5110

[tel:+16472545110 →](tel:+16472545110)

assignment

## Diagnostic Inspection Request

Free in-home inspection with a written diagnostic, anywhere in the Toronto GTA.

**Thanks, we have your request.** A Toronto dispatcher will call you to confirm the inspection slot.

-   workspace\_premium 25+ Years Experience
-   bolt Same-Day GTA Emergency Response
-   verified\_user Written Workmanship Warranty
-   gavel OBC Part 9 Compliant
-   savings Up to $3,400 CAD Subsidy Filed

## How Crack Injection Seals a Foundation Wall

Foundation Waterproofing Toronto repairs leaking cracks in detached, semi-detached, and new-build homes across Toronto and the GTA by filling the entire thickness of the wall, not the face of it. We set **injection ports (packers)** along the crack at spacing matched to the wall thickness, seal the surface between them with a fast-setting paste, then inject resin at low pressure starting at the lowest port. When resin appears at the port above, that section is full and we move up. The result is a continuous plug through the wall rather than a cosmetic patch.

Two products do two different jobs. **Low-pressure polyurethane injection** uses a closed-cell resin that expands on contact with moisture and stays flexible afterward, which is what you want in a crack that will see seasonal movement. **Structural epoxy resin** cures rigid with high **tensile strength PSI** and bonds the crack faces into one structural section again. Water control gets polyurethane. Load-bearing repair gets epoxy. Using epoxy on a moving crack is how repairs fail.

Crack injection is concrete repair at its most targeted: one crack, one product, one visit. Where the crack is only one of several water entry points, or the weeping tile at the footing has failed, it becomes part of a wider 

basement waterproofing

[/basement-waterproofing-toronto/ →](/basement-waterproofing-toronto/)

 scope, and the inspection will say so.

## How to Read a Crack Before the Inspection

Before the inspection, it helps to know what you are looking at.

-   **Orientation.** Vertical cracks are usually curing shrinkage. Diagonal cracks from an opening corner suggest settlement. Horizontal cracks mean lateral soil load.
-   **Width.** Anything you can fit a business card into is worth measuring properly. Hairline to 1/4 inch is the non-structural range.
-   **Offset.** Run a finger across the crack. If one face sits proud of the other, the wall has moved, and that changes the recommendation.
-   **Staining.** A rust-coloured or white **efflorescence** trail below the crack confirms water has been moving through it repeatedly.
-   **Company.** A single crack in the middle of a long wall is typical shrinkage. Several parallel cracks, or cracks matched by a crack in the slab, point to a foundation issue.

## Polyurethane or Epoxy: Which Injection Does Your Crack Need?

These are 2026 CAD rates and match the price tiers further down the page.

| Product | Cost in Toronto | What it is for |
| --- | --- | --- |
| Low-pressure polyurethane | $500 to $1,200 CAD per crack | Water control in a non-structural crack that will see seasonal movement; stays flexible after curing |
| Structural epoxy | $700 to $1,800 CAD per crack | Load-bearing repair in sound poured concrete; cures rigid and bonds the faces |
| Exterior membrane repair | $2,500 to $6,500 CAD | Where the crack has to be treated from the soil face, with excavation, parging, and membrane |
| Multi-crack package | $1,400 to $3,200 CAD | Two to four cracks treated in one visit, with setup shared across every crack |

## Why Poured Concrete Foundations Crack in Toronto Clay

Concrete shrinks as it cures. On a long foundation wall, that shrinkage has to relieve somewhere, and it does so as a vertical crack, usually near a window opening, a form tie line, or an area of **concrete honeycombing** where the pour was not fully consolidated. That is normal and it happens in the first two years, which is why we see it as often in new subdivisions in Vaughan and Markham as in postwar bungalows in North York and Scarborough.

What makes Toronto different is what happens afterward. The Halton Till clay under much of the city swells when saturated and shrinks when dry, and the **freeze-thaw** cycle repeats that load dozens of times each winter. A hairline crack that would stay dry in sandy soil becomes a recurring leak here, because the soil is delivering water to the wall under hydrostatic pressure every spring thaw.

## When Should a Crack Not Be Injected?

We turn down injection work regularly, and it is worth knowing why.

If the wall shows a **horizontal bowing shear crack**, the concrete is being pushed inward by soil pressure. Filling the crack does nothing about the load. The correct scope is carbon fibre or steel reinforcement, usually with an engineer’s stamp, which is covered under 

concrete foundation repair

[/concrete-foundation-repair-toronto/ →](/concrete-foundation-repair-toronto/)

. Diagonal cracks from ongoing footing settlement are also an engineering question first, because the answer may be underpinning rather than any crack product.

If the crack is in a concrete block or masonry wall, common in the 1920s to 1950s houses of East York, the Danforth, and older Etobicoke, water is travelling through hollow cores rather than a single void, and injection cannot chase it. 

Interior drainage

[/interior-weeping-tile-toronto/ →](/interior-weeping-tile-toronto/)

 or 

exterior membrane

[/exterior-weeping-tile-toronto/ →](/exterior-weeping-tile-toronto/)

 is the honest fix.

If the crack leaks only when a specific downspout runs, the crack is a symptom. Fixing the discharge and the grade may reduce the load enough that the injection holds for decades rather than seasons.

## Exterior Crack Repair: Excavation, Membrane and Parge Coat

Where we do excavate, the process is targeted. We open a trench only at the crack, clean the wall face, repair any spalled concrete, and apply hydraulic cement parging where the surface is irregular so the **parge coat** gives the membrane a continuous substrate. We then bond an elastomeric membrane such as **Blueskin** over the repair and fasten **Delta-MS** drainage board. Backfill goes in lifts and gets tamped. This costs $2,500 to $6,500 CAD and is worth it when the wall above the crack is also failing, or when interior access is blocked by a finished basement you do not want opened.

## How We Compare

| What you get | Typical provider | Foundation Waterproofing Toronto |
| --- | --- | --- |
| Pricing | Quoted only after a site visit | $500 to $1,800 CAD per crack published on this page (2026 pricing) |
| Crack triage | Verbal opinion | Orientation, measured width, and offset documented in writing |
| Product choice | One resin for every crack | Polyurethane for water control, structural epoxy for load-bearing repair |
| Warranty | Unstated or verbal | 10-year written workmanship warranty, re-injection at no charge |
| Structural cracks | Injected anyway | Referred to engineering, with City of Toronto permit administration handled |
| Track record | Unstated | 25+ years, WSIB registered, $2M liability insurance |

## What You Get in Writing After the Repair

Every crack repair produces a written diagnostic naming the crack type, the measured width, the product used, and the 10-year written workmanship warranty certificate. If the crack was triaged as structural, the file also includes the engineering correspondence and the City of Toronto permit close-out. That paperwork is also what a buyer’s home inspector will ask for when a crack shows up on a pre-purchase report.

If a crack on your wall is weeping every spring, book the free in-home inspection with the Foundation Waterproofing Toronto crew. You will get the crack type, the correct product, and the per-crack CAD price in writing, and in most cases the repair can be done on the same visit, from Leaside and Willowdale out to 

Mississauga

[/service-areas/mississauga/ →](/service-areas/mississauga/)

, Brampton, and 

Vaughan

[/service-areas/vaughan/ →](/service-areas/vaughan/)

. Crack injection is the smallest scope on our 

foundation waterproofing Toronto

[/ →](/)

 price list, and often the only one a sound wall needs.

Diagnosis

## 5 Types of Foundation Cracks and What They Mean

Not every crack needs repair, and the ones that do need different products. This is how we triage a crack during the free inspection, and it is the same way you can read your own wall before we arrive.

1.  01
    
    ### Hairline vertical shrinkage cracks
    
    Thin vertical cracks from concrete shrinkage during curing. Non-structural. They leak, so they get polyurethane, but they are not a stability concern.
    
2.  02
    
    ### Vertical cracks wider than 1/4 inch
    
    Width beyond a quarter inch suggests movement rather than curing. We measure with a crack gauge, check for offset between the faces, and decide between polyurethane and epoxy.
    
3.  03
    
    ### Diagonal cracks from a corner
    
    Cracks that run diagonally from a window or door corner usually indicate differential settlement on one side of the footing. These need monitoring and often engineering input.
    
4.  04
    
    ### Stair-step cracks in block or brick
    
    Stair-step mortar joint cracks follow the mortar in concrete block or masonry walls. They are movement cracks and point to settlement or lateral soil pressure.
    
5.  05
    
    ### Horizontal cracks across the wall
    
    A horizontal bowing shear crack is the one to take seriously. It means soil pressure is pushing the wall inward. This requires carbon fibre or steel reinforcement, not injection alone.
    

Our framework

## How Our Crack Injection Process Works, 5 Steps

Crack repair is often finished on the same visit as the inspection, but the sequence never changes.

1.  1 calendar\_month
    
    ### Booking
    
    Send your postal code, photos of the crack, and when it leaks, from a Riverdale semi to a new build in Vaughan. Photos alone tell us a lot about orientation and width.
    
2.  2 search
    
    ### On-site triage
    
    We measure width with a crack gauge, check for offset, inspect the exterior grade, downspouts, and the condition of the weeping tile, and confirm whether the crack is structural or non-structural.
    
3.  3 description
    
    ### Written diagnostic
    
    You get the crack type, the recommended product, the per-crack CAD price, and whether any drainage work should come first.
    
4.  4 build
    
    ### Injection
    
    Surface ports are set along the crack, the face is sealed, and resin is injected at low pressure from the bottom up until it appears at the next port.
    
5.  5 verified
    
    ### Verification
    
    Ports are removed, the wall is ground flush, we water test where possible, and the written workmanship warranty is issued in writing.
    

Published CAD Pricing

## How Much Does Foundation Crack Repair Cost in Toronto?

These are 2026 rates. Crack repair is priced per crack, not per house, because most homes need one or two cracks sealed rather than a system. These are the published CAD bands. If the inspection shows the crack is a symptom of a larger drainage problem, the diagnostic says so rather than selling you an injection that will not hold.

Most requested

### Polyurethane Injection

$500 to $1,200 CAD per crack

The standard water-control repair for non-structural vertical cracks in poured concrete.

-   check Low-pressure injection from the basement side
-   check Expanding closed-cell resin fills the full wall thickness
-   check Usually completed in a single visit

### Structural Epoxy Injection

$700 to $1,800 CAD per crack

For load-bearing repair where the concrete needs its tensile strength restored.

-   check High tensile strength epoxy resin
-   check Welds the crack faces back into one section
-   check Used where engineering confirms a structural crack

### Crack Repair With Exterior Membrane

$2,500 to $6,500 CAD

Excavation at the crack location, exterior membrane patch, and drainage board.

-   check Targeted excavation, not full perimeter
-   check Elastomeric membrane over the repaired section
-   check Recommended where the crack sits below a downspout or window well

### Multi-Crack Packages

$1,400 to $3,200 CAD

Two to four cracks treated in one mobilisation, which removes duplicate setup cost.

-   check Per-crack rate drops after the first crack
-   check One permit and one visit
-   check Full written diagnostic covering every crack on the wall

Crack injection carries a 10-year written workmanship warranty. If a repaired crack leaks within those ten years we return and re-inject at no charge.

Straight answers

## What Toronto Homeowners Ask Before Repairing a Foundation Crack

### Can I just use hydraulic cement from the hardware store?

Surface patching seals the face of the crack but leaves the full wall thickness open, so water keeps travelling inside the concrete and re-emerges elsewhere. Injection fills the crack through the entire wall section, which is why it carries a warranty and a patch does not.

### How do I know you are not calling a harmless crack structural?

The written diagnostic states the crack orientation, the measured width, whether there is face offset, and the reasoning for the product we recommend. If the crack is non-structural, we quote polyurethane, which is the cheaper of the two options.

### Will injection hold if my soil keeps moving?

Polyurethane stays flexible and tolerates minor seasonal movement from freeze-thaw cycling. Where movement is ongoing and significant, the honest answer is that injection alone is not the fix, and the diagnostic will recommend stabilisation or drainage instead.

### Do you have to dig up my yard?

Not for most repairs. Injection is done from the basement side with no excavation. We only recommend exterior membrane repair where the crack sits under a downspout, a window well, or a section of wall that also needs parging.

Why us

## Why Toronto Homeowners Choose Us for Foundation Crack Repair

engineering

### 25+ Years of Foundation Waterproofing Experience

We have injected cracks in everything from 1920s Riverdale block walls to new poured concrete in Vaughan, which is what makes the triage reliable.

receipt\_long

### Per-Crack CAD Pricing

Published per-crack rates, not a per-house number. Two cracks cost less than two separate visits, and the rate is on the page.

description

### Structural Triage in Writing

Every crack gets an orientation, a measured width, and a documented reason for the product we recommend.

workspace\_premium

### Written Injection Warranty

If a repaired crack leaks within ten years, we return and re-inject at no cost.

schedule

### Often a Single Visit

Most non-structural injections are completed the same day as the inspection, with no excavation and no landscaping damage.

assignment\_turned\_in

### Engineering Coordination

Where a crack turns out to be structural, we coordinate the engineer and handle City of Toronto permit administration.

Our work

## Foundation Crack Repair Projects Across the GTA

Documentary photos from Toronto basements and foundation trenches. Select any image to enlarge.

 

 

Customer Feedback

## What Customers Say About Our Foundation Crack Repair

Verified project feedback from Toronto and GTA homeowners. Names are shortened for privacy.

format\_quote

> Two weeping cracks in our Riverdale basement after every storm. The crew injected both with polyurethane in one afternoon for $1,450 CAD and wrote up why neither needed epoxy. Dry since.

Eleni K.Riverdale

format\_quote

> Another contractor told us our crack was structural and quoted carbon fibre. This crew measured it at 3 mm with no offset, called it a shrinkage crack, and injected it for $900 CAD. That was two winters ago.

Rafael M.Willowdale

format\_quote

> Our Leaside house had a crack right under a downspout. They fixed the downspout discharge first, then injected, and explained that skipping the drainage step is why the previous repair failed.

Tabitha N.Leaside

Answers

## Foundation Crack Repair FAQs

How much does foundation crack repair cost in Toronto? expand\_more

At 2026 rates, polyurethane injection runs $500 to $1,200 CAD per crack and structural epoxy runs $700 to $1,800 CAD per crack. Exterior membrane repair after excavation is $2,500 to $6,500 CAD. Multi-crack work is discounted after the first crack because setup is shared.

How do I know if my foundation crack is structural or non-structural? expand\_more

Non-structural cracks are vertical, hairline to 1/4 inch, and come from concrete shrinkage. Structural cracks are horizontal, stair-step, wider than 1/4 inch, or show offset between the two faces. We measure and document which type you have during the free inspection.

What is the difference between polyurethane and epoxy injection? expand\_more

Polyurethane is a flexible expanding resin that fills the crack and stops water, tolerating minor seasonal movement. Epoxy is rigid and has high tensile strength, so it structurally welds the crack faces together. Water control gets polyurethane, load-bearing repair gets epoxy.

How long does crack injection take? expand\_more

A single crack takes one to two hours including preparation and cleanup. Most repairs are completed on the same visit as the inspection, and the basement is usable immediately afterward.

Can you repair a foundation crack from the outside? expand\_more

Yes. Exterior repair means excavating at the crack location, cleaning the wall, applying an elastomeric membrane over the repaired section, and adding drainage board. It costs more because of the excavation, and we recommend it when the exterior wall also needs attention.

Will a repaired crack crack again? expand\_more

The injected section becomes stronger than the surrounding concrete, so new movement typically appears beside the repair rather than through it. That is why ongoing movement gets stabilised rather than injected, and why the diagnostic looks at the cause before recommending a product.

Do you repair cracks in concrete block foundations? expand\_more

Block walls are treated differently. Injection works in poured concrete because the crack is a continuous void. In block, water travels through hollow cores, so the fix is usually cove joint sealing, an interior drainage membrane, or exterior membrane, depending on the diagnostic.

Is a leaking crack an emergency? expand\_more

A weeping crack during a storm is not an emergency in the way active flooding is, but it should not wait a season. Water moving through concrete accelerates freeze-thaw damage and corrodes reinforcement, and the repair cost stays flat while the damage does not.

Can I finish my basement after crack injection? expand\_more

Yes, once the repair is verified. We recommend waiting through one heavy rain cycle before framing over the repaired wall so the water test happens with the wall still visible.

What resin is used for foundation crack injection? expand\_more

We use commercial-grade injection resins, including Emecole Metro polyurethane for water control and two-part structural epoxy for load-bearing repair. The product is chosen by crack type, never by habit, and named in the written quote.

How long is the warranty on foundation crack injection? expand\_more

Polyurethane and epoxy crack injection carries a 10-year written workmanship warranty. If an injected crack leaks within ten years, we return and re-inject it at no charge. Interior weeping tile systems carry a separate 25-year transferable warranty.

What is the typical cost of basement waterproofing in Toronto? expand\_more

It depends on scope. As of 2026, crack injection is $500 to $1,800 CAD per crack, interior weeping tile is $110 to $220 CAD per linear foot ($8,000 to $18,000 CAD for a full perimeter), and full-perimeter exterior waterproofing is $15,000 to $35,000 CAD. A single leaking crack in a sound poured wall rarely needs a full system.

### Still have a question about your basement

Book a free in-home inspection and we will answer it in writing, with the scope and the CAD price on the same page.

Book Free In-Home Inspection

[/contact/ →](/contact/)

## Related Services

Wet basements rarely have a single cause. These services are the ones most often scoped alongside this work on Toronto homes.

water\_damage

### Basement Waterproofing Toronto

Interior and exterior basement waterproofing in Toronto and the GTA for homes with hydrostatic pressure, efflorescence, or spring-thaw seepage, with a free inspection and published CAD pricing.

View details arrow\_forward

[Basement Waterproofing Toronto →](/basement-waterproofing-toronto/)

foundation

### Concrete Foundation Repair Toronto

Concrete foundation repair in Toronto and the GTA: structural crack repair, carbon fibre or steel bowing wall stabilization, rubble stone repointing, and foundation rebuilds, with structural engineer coordination and City of Toronto Building Division permits under Ontario Building Code Part 9.

View details arrow\_forward

[Concrete Foundation Repair Toronto →](/concrete-foundation-repair-toronto/)

water\_drop

### Basement Leak Repair Toronto

Basement leak triage: wall crack, cove joint, window well, or floor slab source diagnosed via moisture meter reading and camera inspection, matched to targeted polyurethane injection, sealing, or drainage fix.

View details arrow\_forward

[Basement Leak Repair Toronto →](/basement-leak-repair-toronto/)

![](/images/misc/two-crew-members-comparing-a-written-crack-diagnos.webp)

Same-Day GTA Emergency Response

## Get a written foundation crack repair diagnostic for your Toronto home

Book the free in-home inspection and we confirm the water source, the scope, and the CAD price in writing before anyone picks up a tool.

calendar\_month Book Free In-Home Inspection

[/contact/ →](/contact/)

 

call Call (647) 254-5110

[tel:+16472545110 →](tel:+16472545110)

-   check\_circle Free in-home inspection with a written diagnostic
-   check\_circle Published CAD pricing before any work starts
-   check\_circle OBC Part 9 compliant, WSIB registered, $2M insured