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Permanent Foundation Crack Repair in Mississauga

A foundation crack starts as a hairline and ends as a highway for water. We inject it full-depth — polyurethane for active leaks, epoxy for structural cracks — so it's sealed for good, not just hidden.

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DrainCom is the

No. 1 Rated

choice for licensed and insured basement waterproofing services in Mississauga, Canada.

A foundation crack won’t seal itself. What starts as a hairline gap becomes a water path into your basement — and a little wider every freeze-thaw winter until it’s a real problem.

At DrainCom, we’ve sealed foundation cracks for over 20 years. We’re foundation crack specialists — not a general contractor who smears on sealant and hopes for the best.

Polyurethane and epoxy injection, structural repair, carbon fibre reinforcement, exterior repair, cold joints — we cover all of it. Licensed technicians, industry-grade materials, and a lifetime warranty on injected cracks.

⚠️ Water in your basement right now? Call 905-238-6800 or 416-989-5757 – we offer emergency foundation crack repair across the GTA.

The Homeowners Whose Cracks Never Leaked Again

A foundation crack is a direct path for water, and it opens a little wider every freeze-thaw winter. The homeowners who call us are done watching it grow. These are the ones whose cracks were sealed for good and never leaked again. Over 20 years, we’ve earned a 9.9 out of 10 on HomeStars across more than 800 reviews and sealed more than 10,000 foundation cracks across the GTA.

The Right Repair for Every Kind of Crack

The right repair depends entirely on the crack. We diagnose first, then match the method to the problem.

Vertical crack with water seepage and moisture staining on concrete basement foundation wall GTA

Polyurethane Crack Injection

We inject flexible polyurethane resin into the crack, where it expands to fill the full depth. It stays flexible after curing, moving with seasonal shifts instead of re-cracking — the standard fix for active leaks.

Epoxy Crack Injection

We inject epoxy resin to bond the crack permanently and restore the concrete’s strength. Epoxy cures rigid, so it’s the right choice for structural cracks — welding the wall back together, not just stopping water.

Structural Foundation Crack Repair

For cracks affecting your wall’s load-bearing capacity, we assess the severity and apply epoxy injection or added reinforcement to restore structural integrity — before any cosmetic or waterproofing work goes ahead.

Carbon Fibre Wall Reinforcement

For a bowing wall or a horizontal crack under soil pressure, we apply carbon fibre straps to the wall. They add enormous tensile strength and stop further movement, all without excavation.

Exterior Foundation Crack Repair

For cracks we can reach from outside, we excavate to the footing and apply a membrane over the repaired crack, then backfill — fixing the problem right at the source.

Concrete and Cold Joint Repair

Cold joints — the seams where separate concrete pours meet — are common leak points that aren’t true cracks but behave the same way. We seal and inject them with the same proven methods.

Here's Everything Riding on One Sealed Crack

Sealing a crack the right way does more than dry a wet spot. Here’s what it protects:

  • Your finished basement — keeps water off flooring, drywall, and everything you’ve built downstairs.
  • Your foundation’s strength — a bonded structural crack restores the wall’s load-bearing capacity.
  • Your indoor air — stopping the moisture cuts the mould and musty smell that follow a leaking crack.
  • Your home’s resale value — a home inspector will flag an open crack fast; a documented repair with warranty removes that red flag.
  • Your peace of mind — no more watching that seam every time a storm rolls through.
  • Your wallet, long term — a proper injection now beats a drainage or excavation job after the crack widens.
Water seepage and mold at a basement wall corner crack needing foundation crack repair

What You'll Pay for Foundation Crack Repair in Mississauga

Crack repair is a diagnosis-first job, not a fixed-price item. The cost depends on the number of cracks, whether the work is interior or exterior, and whether the crack is structural. Here’s a realistic guide.

Repair TypeTypical PriceNotes
Hairline / non-structural crack injection$473 – $1,418 per crackCommon Mississauga pricing for epoxy or polyurethane
Typical crack repair$500 – $2,000 per crackBroader range for standard crack repairs
General foundation crack repair$250 – $5,000+Wide range by crack severity and method
Structural / larger foundation repair$2,000 – $7,000+For more serious or structural cracks
Horizontal crack repair with reinforcement$4,000 – $8,000Often needs carbon fibre straps or wall anchors
Full project — multiple cracks or excavation$3,500 – $20,000Larger jobs, bowing walls, or exterior excavation

DrainCom provides a written quote after an on-site assessment – no phone estimates, because a crack has to be seen to be diagnosed properly.

Why One Crack Costs More Than the Next

Crack type and method

Polyurethane injection for an active leak generally costs less than epoxy structural repair, which needs more prep and a different process.

Interior versus exterior access

Interior injection is faster and less invasive. Exterior repair means excavating to the footing, which adds labour and equipment.

Number of cracks

Several cracks repaired in one visit cost less per crack than booking separate appointments.

Structural severity

Cracks affecting load-bearing capacity may need carbon fibre or other reinforcement beyond standard injection.

Peel Clay, Frost, and Why Foundations Crack

Cracks here aren’t bad luck — they’re built into the local ground. Much of Mississauga sits on heavy clay that swells when it’s wet and shrinks when it dries. That constant push-and-pull works on your foundation walls all year.

Stair step crack along mortar joints in a block wall needing foundation crack repair
  • Clay soil movement — Peel clay expands and contracts with the seasons, stressing the concrete until it cracks.
  • Freeze-thaw cycles — water in a hairline crack freezes, expands, and pries it wider every winter.
  • Hydrostatic pressure — saturated soil pushes against the wall and can drive horizontal cracks and bowing.
  • Concrete shrinkage — most vertical hairline cracks are simply the original pour curing and shrinking.
  • Poor drainage — clogged gutters, bad grading, or failed weeping tile keep the soil wet and the pressure high.
  • Older concrete — homes built before the 1970s often used lower-grade concrete or block that cracks more readily.

Roughly nine out of ten residential foundation cracks in the GTA are non-structural — a water problem, not a stability one. The trick is knowing which kind you’ve got, and that’s what our assessment settles.

Leaking or Growing? That Crack's Warning You.

Not every crack is an emergency, but a leaking, growing, or telltale crack should be looked at before it gets worse.

  • Water seepage or staining around a crack, especially after rain.
  • Cracks wider than one-eighth of an inch, or ones that have grown over time.
  • Horizontal cracks, which often point to structural pressure rather than normal settling.
  • Stair-step cracking in a block foundation wall.
  • Efflorescence — white, chalky deposits forming near the crack.
  • Musty odour or visible mould near the foundation wall.
  • Sticking doors or windows near the foundation that have become hard to open or close.
Dimpled waterproofing membrane installed after foundation crack repair in a block basement

No Guesswork — Every Step to a Watertight Crack

Cracked basement wall and fresh concrete floor patch after basement leak repair in Mississauga

Assessment

We inspect the crack, determine whether it’s structural or non-structural, and check if it’s still active or has stabilized.

Diagnosis

Based on what we find, we recommend polyurethane, epoxy, exterior repair, or a combination — and explain why.

Quote

You get a detailed written quote before any work starts, covering method, scope, and timeline.

Surface preparation.

We clean the crack surface and install injection ports at intervals along its length.

Injection

We inject resin under pressure, filling the crack from the inside out for full-depth penetration, not just a surface seal.

Curing

The resin cures fully, typically within 24 to 48 hours depending on the product.

Final inspection

We confirm the crack is fully sealed and walk you through your warranty coverage.

Poly, Epoxy, or Exterior? Here's How We Decide.

The right method comes down to your goal — stop water, restore strength, or fix it from outside. Here’s how they compare.

MethodBest ForBehaviourProcess
Polyurethane InjectionActive, leaking cracksFlexible, expands, moves with the wallFast, less invasive
Epoxy InjectionStructural cracks needing strength restoredRigid, bonds concrete permanentlyFast, less invasive
Exterior RepairCracks with exterior access or heavy outside water pressureAddresses the source from outsideExcavation required, more involved

Our assessment determines which one applies to your foundation.

20,000+ Basements Later, Here's Why Homeowners Trust Us

  • 20+ years of foundation crack repair. We’ve sealed leaking and structural cracks across Mississauga with methods built for our clay soil and freeze-thaw winters.
  • A track record you can check. More than 20,000 homes waterproofed and repaired, over 10,000 foundation cracks sealed, and 800+ reviews on HomeStars at a 9.9/10 rating.
  • DrainCom diagnose before we repair. Structural or non-structural, active or stable, interior or exterior — we identify it first, then fix it right.
  • Lifetime warranty on injected cracks. Properly injected cracks are backed in writing, so a sealed crack stays sealed.
Request Your Free Inspection
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  • Takes 5 seconds
  • No obligation

Top Rated Waterproofers just a call away!

Business Hour:
Monday to Friday: 8a.m -9p.m
Saturday and Sunday: 9a.m – 2p.m

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Foundation Crack Questions, Answered Straight

Most single-crack interior repairs are done in two to three hours, including surface prep, injection, and initial curing.

Properly injected cracks are permanently sealed. The resin fills the crack’s full depth, not just the surface, so the same crack shouldn’t reopen or leak again.

Polyurethane is flexible and best for stopping active water leaks. Epoxy cures rigid and is used when the goal is restoring structural strength to the concrete.

Hardware-store sealants can give a short-term fix for very minor, non-leaking cracks. For active leaks or any crack showing structural signs, proper pressure injection is what delivers a permanent result.

Often, yes. Horizontal cracks can signal pressure against the wall — from soil or hydrostatic pressure — and should be assessed promptly to rule out a structural concern.

Both. Interior injection is faster and handles most leaking cracks well. Exterior repair is recommended when there’s heavy outside water pressure or when excavation is already planned.

Hollow cinder-block walls can’t hold the injected resin. Those foundations need interior waterproofing or exterior waterproofing instead, and we’ll confirm which applies during the assessment.

 Yes. DrainCom provides a lifetime warranty on properly injected cracks, detailed in writing as part of your quote.

Book Your Free Foundation Crack Assessment Today

A small crack today is a cheap fix; the same crack ignored is a drainage or excavation job tomorrow. Our team will inspect the crack, diagnose the cause, and recommend the right repair for your home.

You’ll get honest advice, a written estimate, and zero pressure to move forward.

Book Your Free Basement Inspection
Call 905-238-6800

Round Out Your Water Defence While We're Here

Crack repair often ties into your home’s broader water defence. If your assessment turns up more, we handle it all with a single crew:

Our Service Area

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905-238-6800
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