H2OFoundation wall cracks
Shrinkage and settlement cracks in poured walls, sealed through the full wall thickness so water can't find a path around the repair.
Polyurethane crack injection · London & Southwestern Ontario
Leaking crack?
Sealed from the inside.
We inject water-activated polyurethane resin deep into foundation cracks, tie-rod holes and joints. It expands, fills the full depth of the wall and cures into a flexible seal. No digging up your driveway, gardens or deck.
Interior repairWorks on active leaksResidential & commercial
No excavation
Repairs are done from inside the basement. Landscaping stays put.
Stops running water
The resin reacts with water, so it seals cracks that are leaking right now.
Moves with the wall
Cured foam stays flexible as concrete expands and contracts through Ontario winters.
Pro-grade materials
Injection resins supplied by MME Multiurethanes, a Canadian grouting specialist since 1988.
Services
What we seal
Most basement leaks come through a handful of weak points in poured concrete. We target each one directly.
Tie-rod & snap-tie holes
The small round leaks left by formwork ties. A common source of damp spots and white mineral streaks.
Cold joints & wall-floor joints
The seams where one concrete pour meets another. Flexible resin handles the movement these joints see over time.
Pipe & utility penetrations
Leaks around water lines, gas lines and conduit where they pass through the foundation.
Parking garages & pits
Underground parking, elevator pits, mechanical rooms, chambers and tanks. Planned around your operating hours.
Inspection & leak mapping
We trace where water is really entering before quoting. Backed by Cyborg Construction Consultants when a crack needs an engineer's eye.
How it works
A typical crack, start to finish
Most single residential cracks are completed in one visit.
Inspect
We find the crack's full length, check whether it's active, and look for signs of structural movement.
Drill & set ports
Holes are drilled at an angle to meet the crack mid-wall, staggered on alternating sides. Mechanical packers go in each hole.
Flush
The crack is flushed with water. This clears debris and gives the water-reactive resin what it needs to foam.
Inject
Resin is pumped from the lowest port up. We move to the next port once resin appears there, so the crack fills completely.
Finish
After curing, packers are removed, holes are patched and the work area is cleaned up.
Why polyurethane
Choosing the right repair
Each method has its place. For a leaking, non-structural crack, polyurethane injection is usually the most direct fix.
| Polyurethane injection | Epoxy injection | Exterior excavation | |
|---|---|---|---|
| Main purpose | Stopping water | Structural bonding | Full exterior membrane |
| Wet or leaking crack | Yes. Water triggers the reaction | Crack should be dry | Yes |
| After curing | Flexible, tolerates movement | Rigid | Depends on membrane |
| Disruption | Interior only, small drill holes | Interior only | Digging along the wall, landscaping removed |
| Typical timeline | Hours | Hours, plus cure | Days |
Wide cracks, cracks that shift out of plane, or cracks that keep growing can point to a structural issue. We'll tell you plainly if that's what we see, and refer you for an engineering review instead of sealing over it.
Materials
What goes into your wall
We use injection systems from MME Multiurethanes Ltd. of Mississauga, Ontario. Their resins are specified by engineers on tunnels, dams and parking structures.
MME Flexible Resin
Hydrophobic polyurethane groutA low-viscosity, single-component resin made for fine concrete cracks. On contact with water it forms a flexible, water-repellent foam that holds its size once cured, without shrinking or swelling. It's certified for use near potable water, and it's solvent-free.
- Colour
- Clear to light yellow
- Viscosity @ 25 °C
- 400 – 600 cP
- Relative density
- 1.04 – 1.07
- Accelerator dose
- 1 – 10 % (2 % typical)
- Shelf life
- Up to 12 months
Flexible Accelerator
A catalyst blended into the resin to set reaction speed for the conditions on site, from a slow seep to a fast-running leak.
Crack Flushing Agent
Used to prepare the crack before injection so the resin can travel and bond.
Watch it done
MME's own demonstration of polyurethane crack injection stopping a leak.
Warning signs
When to call us
Water after rain
Wet floor or a damp line along a crack after storms or snowmelt.
White streaks
Chalky mineral deposits (efflorescence) show water has been passing through.
Musty basement
A persistent damp smell, or mould on finished walls and baseboards.
Before you finish
Sealing cracks before framing and drywall go up costs far less than opening walls later.
FAQ
Common questions
Can you fix a crack that's leaking right now?
Yes. Polyurethane resin is activated by water, so an actively leaking crack is a good candidate. We can control the reaction speed to suit how fast the water is moving.
Do you need to dig outside?
No. Injection is done entirely from the interior. We drill small holes along the crack, inject, then patch the holes.
My basement is finished. Can you still do it?
Usually we need access to the concrete along the crack. Often that means removing a strip of drywall or panelling, which is far less than an exterior dig. We'll confirm during the assessment.
Will the crack open up again?
Concrete keeps moving with temperature and moisture. The cured foam stays flexible, so it can accommodate normal movement that would crack a rigid patch.
Is the crack a structural problem?
Most vertical hairline shrinkage cracks aren't. Horizontal cracks, bowing walls or cracks with one side offset need a closer look. Through our sister company, Cyborg Construction Consultants, we can arrange an engineering review.
Do you do commercial work?
Yes: underground parking, elevator pits, mechanical rooms and other below-grade concrete. We schedule around your operations.
Free estimate
Tell us about the leak
Send a few details and a photo if you have one. We'll call you back to book an assessment.
Phone519-686-7330
Emailinfo@cyborgconsultants.ca
Service areaLondon & Southwestern Ontario