Concrete Floor Crack & Joint Preparation
Crack and control-joint preparation as part of polished concrete, epoxy or polyaspartic coating systems, warehouse floor rehabilitation, and new coating installations. Semi-rigid joint fillers rated for traffic and forklift loads.
Surface filler is not a crack repair. The product everyone has seen at the hardware store — caulk-tube concrete crack filler — fails within 12 to 18 months in Toronto's freeze-thaw climate. The crack reopens, water gets in, and the cycle continues until either the rebar corrodes or the slab fails. Permanent crack repair is a structural process, not a cosmetic one, and the difference is in the product, the prep, and the technique.
Concrete Repair Plus performs structural crack repair — residential in Scarborough, East York and North York, and commercial across Toronto and the full GTA — using epoxy injection (for non-moving cracks where you want to restore monolithic strength) and polyurethane injection (for moving cracks and active water leaks). Both systems penetrate the full depth of the crack, bond chemically to the substrate, and seal the path that lets water and brine reach the rebar.
Whether you have a single 6-foot crack across your garage floor, a network of cracks on a 30-year-old driveway, a leaking foundation crack in your basement, or a structural crack on a concrete wall, the diagnostic and repair approach is the same: classify the crack, choose the right system, prepare it properly, inject it under pressure, and confirm the seal. Every repair is backed by a written warranty.
Signs You Need Professional Crack Repair
Concrete cracks fall into a handful of categories. The right repair depends on which one you have — and a quick on-site assessment tells us which.
Cracks Wider Than a Credit Card
Cracks over 1.5 mm let water reach the rebar. They need to be sealed before the next freeze-thaw cycle to prevent corrosion damage.
Cracks That Open and Close Seasonally
Active/moving cracks need flexible polyurethane injection, not rigid epoxy. Wrong product = repeat failure.
Water Leaking Through a Foundation Crack
Wet basement walls during heavy rain almost always trace back to one or two foundation cracks. Polyurethane injection from inside the basement seals the crack permanently.
Cracks With Rust Stains
Brown/orange staining around or out of a crack means rebar corrosion has started. The repair window narrows quickly — call sooner rather than later.
Cracks Across Garage Floors or Driveways
These almost always allow road-salt brine to reach the slab interior. Sealed cracks save the slab thickness; unsealed cracks compound.
Network or Map Cracking
Multiple intersecting fine cracks usually indicate a weak or shrinkage-cracked surface paste — sometimes resolvable with a polymer overlay rather than crack-by-crack injection.
Need a written condition report for your building? We deliver them free — formatted for your reserve-fund consultant and property manager.
How We Get It Right The First Time
- 01
Crack Classification
We assess crack width, movement (active vs. dormant), depth, location (slab vs. wall), and whether water is actively penetrating. The classification dictates the product choice — there is no one-size-fits-all crack repair.
- 02
Surface Cleaning & Routing (When Required)
Concrete on either side of the crack is cleaned. Wide cracks may be V-grooved at the surface to provide a clean injection path; foundation cracks are typically injected through surface ports without grooving.
- 03
Port Installation
Injection ports (small plastic fittings) are bonded along the crack at calculated intervals — close enough that resin reaches every point of the crack at injection pressure.
- 04
Surface Sealing
Between ports, the surface of the crack is sealed with a fast-cure paste so injection pressure forces resin into the depth of the crack rather than back out the front.
- 05
Pressure Injection
Resin is injected starting at the lowest port, working upward (or end-to-end on slabs), until each subsequent port shows resin coming through. This confirms the resin has filled the crack at depth, not just the surface.
- 06
Cure, Port Removal, Finish
Once cured, ports are knocked off, the surface paste is ground flush, and the area is finished to match. The crack is now structurally bonded (epoxy) or flexibly sealed (polyurethane).
- 07
Verification & Warranty
On water-leak repairs we re-test in subsequent rain or with controlled water exposure. Photo documentation and written warranty issued on every job.
Materials & Methods
- Low-viscosity epoxy injection resin (structural, non-moving cracks)
- Hydrophobic polyurethane injection (moving cracks, slabs)
- Hydrophilic polyurethane injection (active water leaks, foundations)
- Surface seal paste (fast-cure epoxy)
- Mechanical and bonded injection ports
- Calibrated injection pumps for accurate pressure
- Polymer-modified surface mortar for finish flush-grinding
How Long It Lasts
Expected Service Life
20+ Years
A properly executed crack injection is a permanent structural repair. Epoxy-injected cracks restore monolithic concrete strength — the bond is typically stronger than the surrounding concrete itself. Polyurethane-injected cracks remain flexible and re-seal across small future movement. Both are designed to outlast the surrounding slab.
- Epoxy injection: structurally permanent, slab will fail elsewhere first
- Polyurethane injection: stays flexible, accommodates movement
- Foundation water-leak repairs: typically 20+ years
- Written warranty on every injection
Why Property Owners Choose Concrete Repair Plus
Surface Preparation Done Right
Most concrete repairs fail in 2–3 years because of poor prep. We mechanically grind and clean every substrate before any patch material touches it — that's why our work outlasts the patch jobs you see fail every spring.
Reinforcement & Bonding Agents
Structural repairs get steel mesh, fibre additives, and bonding primers. Crack repairs get epoxy or polyurethane injection — not just surface filler. The right system for the right damage.
Toronto Climate-Specific Mixes
Cold-weather admixtures, freeze-thaw resistance, and salt-resistant sealers chosen for Toronto's exact climate cycle — not whatever bag was on sale at the supplier.
Written Warranty in Writing
Every job — residential or commercial — gets a written warranty. Not a verbal promise from a number you can't reach next April.
Fully Insured, WSIB-Covered
$5M liability and full WSIB coverage. Property managers and homeowners get a clearance certificate before we set foot on site.
Our Own Crews — Never Subcontracted
Every job is executed by Concrete Repair Plus crews we employ, train, and stand behind. No handoffs, no white-labeled contractors, no revolving door of subs.
“Had a large crack running across our driveway that had been getting worse every winter. Concrete Repair Plus came out, assessed it properly, and fixed it the right way — not just a quick patch job. That was two seasons ago and it still looks perfect. Honest pricing, showed up on time, and cleaned up completely before leaving. Highly recommend.”
Common Questions
Request a Floor Prep Project Assessment
Free, itemized estimates — residential in Scarborough, East York and North York; commercial across the full GTA.