How long does polyjacking last?
Decades, in most cases. Here's why — and the few situations where re-treatment may be needed.
The short answer: polyurethane lifting foam is engineered to outlast the concrete slab itself. The same material has been used under U.S. interstate highways for 40+ years with no documented breakdown. In residential conditions, expect 10+ years comfortably, and often the full life of the slab.
Why foam outlasts mudjacking slurry
Mudjacking uses a sand-cement-water slurry that absorbs groundwater, gradually erodes, and re-settles within 5–8 years. Polyurethane foam is closed-cell and hydrophobic — water cannot enter it, freeze-thaw cannot break it down, and it doesn't add weight to soft soils.
The few times polyjacking does need re-treatment
- A new underground event after the lift (fresh plumbing leak, new excavation next door)
- Severe drought-cycle clay shrinkage on Red River or Champlain clay
- Tree root growth that displaces the soil column years later
What the warranty actually means
A 10-year warranty is your contractor's confidence in the work — not the actual lifespan of the foam. The foam itself is good for the life of the slab. The warranty covers the rare cases where soil dynamics change after the lift.