What causes concrete to sink or become uneven?

Concrete usually becomes uneven because its support changes below the surface. Soil can compact, water can wash fine material away, and voids can form under a slab. In Toronto, freeze-thaw cycles and frost heave can also shift support around joints and edges.

How do I know whether leveling is better than replacement?

Lifting is often worth considering when the slab is still intact and the main problem is settlement, voids, or a dropped edge. Replacement may be the better option when concrete is badly broken, crumbling, severely deteriorated, or cannot be raised safely. A site assessment looks at the slab condition as well as the cause of movement.

What surfaces can be leveled?

Many driveways, sidewalks, patios, pool decks, garage floors, steps, and commercial slabs can be candidates for lifting. Each surface is evaluated on its condition, the amount of movement, and how it needs to perform after the repair.

What is polyurethane foam injection?

Polyurethane foam injection uses expanding, lightweight foam placed through small access points in a settled slab. The foam fills voids beneath the concrete and can raise it in controlled increments. It is one concrete lifting option, selected when the slab, soil conditions, access, and repair goal make it suitable.

How is slab jacking different from mudjacking?

Slab jacking is the broader term for raising settled concrete by placing material beneath it. Mudjacking is one slab-jacking method that uses a slurry-like material. Polyurethane foam injection and polyjacking use expanding foam instead. The suitable method depends on the slab, the void below it, access, and the amount of lift needed.

Can you help with commercial or municipal concrete?

Yes. We help commercial property owners, managers, and municipalities assess uneven walkways, entries, access routes, garage slabs, and other commercial concrete. The focus is on restoring safer, more usable surfaces while considering how the area is used and whether the slab is a sound lifting candidate.

Do you only work in Toronto?

We serve Toronto and the Greater Toronto Area, including North York, Scarborough, Etobicoke, East York, Mississauga, Vaughan, Markham, and Richmond Hill. If you are nearby and dealing with a settled concrete surface, contact us to discuss the location and project.

What should I do if I notice a trip hazard in my sidewalk or driveway?

A trip edge can signal that a slab has lost support and may continue to move. Note where the height difference is, whether water is pooling, and whether cracks or gaps are changing. An assessment can determine whether leveling may reduce the uneven transition or whether the slab needs a different repair.

Polyjacking & Polyurethane Concrete Lifting Toronto

Polyjacking is a polyurethane concrete lifting process used to restore support below settled concrete slabs. It can help with dropped driveways, walkways, patios, garage slabs, pool decks, and commercial concrete when the slab remains serviceable but has lost support below.

Toronto Concrete Leveling uses polyurethane foam injection as the process behind polyjacking. We assess the slab, underlying soil and void conditions, drainage, and desired elevation before determining whether controlled foam lifting is a practical fit.

How Polyjacking Works

Small injection ports are created through the concrete. Expanding polyurethane foam is introduced below the slab, where controlled expansion can fill voids, provide support, and gradually lift the concrete. The lightweight material cures quickly, while the lift is monitored to avoid overcorrection.

What Polyurethane Foam Injection Can Address

Sub-slab voids and loss of support
Settlement-related elevation differences and trip hazards
Sunken slab edges at driveways, walks, and patios
Slab stabilization with or without a significant lift
Concrete affected by soil erosion, washout, or compacted-fill settlement

Conditions That Matter

The cause of settlement affects the repair. Soil erosion, water washout, drainage, frost movement, and disturbed soils can all create voids below slab-on-grade concrete. Polyjacking is not simply a surface-level repair. It is a method for filling the space below a suitable slab and restoring support where conditions allow.

Controlled Slab Lifting

Where a slab has dropped, foam is placed in stages and the elevation is observed as it responds. Where the concrete height is acceptable but a void is present, polyurethane injection may be used primarily for stabilization rather than raising. Severely broken or unsuitable concrete may require a different solution.

Related Services

Explore concrete void filling and slab stabilization, mudjacking and slab jacking, and our Toronto concrete leveling homepage for broader lifting guidance.

Polyjacking & Polyurethane Concrete Lifting FAQ

Is polyjacking the same as polyurethane foam injection?

Polyjacking commonly refers to lifting and stabilizing concrete with injected expanding polyurethane foam.

Can foam fill a void without raising the slab?

Yes. If elevation is acceptable, the objective can be to fill empty space and restore sub-slab support.

What are injection ports?

They are small access points used to place polyurethane below the concrete slab.

What affects whether a slab can be lifted?

Slab condition, cracking, settlement pattern, void conditions, and the cause of support loss all matter.

Does polyurethane foam cure quickly?

It is known for a rapid cure time, though site conditions and the planned repair determine return-to-use guidance.

Can polyjacking help with a drainage-related low spot?

It may help where settlement created the low spot, while the water source and drainage path should also be considered.

Request a Concrete Leveling Estimate

Contact Toronto Concrete Leveling to discuss polyjacking, polyurethane foam injection, and concrete lifting in Toronto and the GTA.

Polyjacking & Polyurethane Concrete Lifting in 452 Glebeholme Boulevard