What is polyjacking?

Short answer

Polyjacking (also called foam jacking or polyurethane concrete raising) is a modern alternative to mudjacking and concrete replacement. A technician drills small holes in the sunken slab, injects high-density polyurethane foam, and the foam expands to fill voids and lift the concrete back to level — usually in under 2 hours, with the surface ready to use the same day.

How polyjacking works (step by step)

1. 1
   Assessment

   A technician measures the slab, marks the lift points, and identifies what's underneath (typically washed-out soil, root channels, or settled fill).

2. 2
   Drilling

   Small 5/8" holes are drilled through the slab at strategic points — usually 4–6 holes per section.

3. 3
   Injection

   Two-part polyurethane foam is injected through a port. The components mix as they enter the void and begin expanding within seconds.

4. 4
   Lifting

   The foam expands with controlled force, filling voids and raising the slab. The technician monitors the lift in real time using lasers or string lines.

5. 5
   Patching

   Once level, holes are patched with color-matched cement. Cure time is roughly 15 minutes — you can drive on the surface immediately.

What does polyjacking cost?

Most Canadian residential polyjacking jobs fall between $500 and $2,500. Pricing typically follows:

• • Single sidewalk slab: $300–$600
• • Driveway section (1 panel): $600–$1,200
• • Full driveway: $1,500–$3,000
• • Garage floor: $1,000–$2,500
• • Patio or pool deck: $800–$2,000

When polyjacking is the right fix

Frequently asked questions