Field guide / Polyurethane concrete lifting
The slab sank.
Find the cause. Check if lifting fits.
Settled driveways, walkways and garage floors can often be raised with expanding foam — but only if the concrete is sound and the reason it sank is dealt with. Learn what applies to your slab, then request an assessment.
01 / Decision spread
Is my slab a candidate?
The concrete and the cause both matter.
Often suitable
- Intact slab that dropped as a unit
- Trip edges at joints
- Slope toward the house or garage
- Hollow-sounding voids
Usually not
- Shattered or crumbling concrete
- Slabs heaved upward by roots or frost
- Asphalt or pavers
Fix the cause too
- Downspouts and grading
- Leaking lines under the slab
- Open joints letting water in
01A / Photographic field references
Look at the concrete, not just the gap.
Real photographs help show why an assessment matters. A broken panel and a slab pushed up by roots call for different repairs than an intact slab that has settled. These are reference photographs, not HAUSE jobs or before-and-after results.
Check whether the panel is sound.
Lifting can restore support under intact concrete. A fragmented edge may need repair or replacement first.
Reference photo: Zoshua Colah / Unsplash · Boston, USA
Upward movement is different.
Foam lifts concrete; it cannot lower a slab pushed up by roots. The cause determines the repair.
Reference photo: Sean Foster / Unsplash · Cincinnati, USA
Want to show the actual condition at your property? Use the four-shot photo guide, then attach photos to your assessment request.
02 / Work order
How a careful job runs
- 01 / Sequence
Assess
Slab condition, settlement and the likely cause.
- 02 / Sequence
Locate
Utilities and drains found before drilling.
- 03 / Sequence
Inject in stages
Foam added gradually while the slab is monitored.
- 04 / Finish
Seal & correct
Patch holes, seal joints, address drainage.
04 / Instrument bench
Tools & visual guides
Free, no sign-up. Check your slab, measure it and plan your photos — then send the summary with your request if you like.
05 / Reference library
Compare your options
06 / Location notes
Location guides
Local soil and climate notes. Availability is confirmed after inquiry.
07 / Submit field notes
Request an assessment
Tell us about the slab. The HAUSE intake team reviews every request and confirms whether a suitable contractor is available near you. No obligation.
08 / Reference notes
Common questions
What is polyjacking?
Raising and supporting a settled concrete slab by injecting expanding polyurethane beneath it through small holes.
Can any sunken concrete be lifted?
No. It suits slabs that are largely intact and have dropped. Broken, deteriorated or heaved concrete usually needs other repairs or replacement.
What does it cost?
It depends on slab size, how far it must be lifted, void volume, access and product. We don’t publish prices; a contractor quotes after assessment.
Who does the work?
PolyJacking.ca is part of HAUSE. Requests are reviewed by the HAUSE intake team, and availability of a suitable contractor is confirmed after review.