Concrete Slab Leveling in Olympia, WA

When lifting works — and when it doesn't

Polyurethane foam lifting (polyjacking) raises a settled slab by injecting expanding structural foam through small ports drilled in the concrete. It is fast, clean, and far cheaper than replacement — but only where the slab itself is still sound.

Good candidates

• Driveways, walkways, patios and garage floors that have settled as intact pieces
• Trip hazards at joints between otherwise sound panels
• Slabs that have dropped because fill beneath them consolidated or washed out
• Pool decks and steps that have pulled away from the structure

Poor candidates

• Concrete that is extensively cracked, spalling or crumbling — lifting a failing slab just relocates the failure
• Slabs broken into many small fragments, which will not move as a unit
• Thin or unreinforced concrete that will crack under point lifting
• Situations where the underlying cause — an active leak, an eroding downspout discharge — hasn't been addressed first

If a slab is structurally spent, lifting it is money spent twice. An honest assessment sometimes concludes replacement is the cheaper answer over any reasonable horizon.

Foam versus mudjacking

Traditional mudjacking pumps a cement slurry under the slab. It still has a place, but polyurethane has largely displaced it for residential work in this region for a few concrete reasons:

• Weight. Slurry is heavy — it adds load to the very soil that already failed. Foam weighs a small fraction of that.
• Hole size. Foam ports are typically around 5/8 inch; mudjacking holes are commonly 1–2 inches and far more visible afterwards.
• Cure time. Foam reaches working strength in minutes, so a driveway is usually drivable the same day. Slurry needs longer.
• Water sensitivity. Cementitious slurry can wash out over time where water moves under a slab; closed-cell foam does not absorb water.

Mudjacking can still be the better value on large, heavy commercial slabs or where the void is very large. For a typical residential driveway here, foam usually wins.

What to expect on the day

Most residential lifts are a few hours, not days:

• Ports are drilled in a pattern matched to the void and the slab geometry
• Foam is injected in controlled stages while the lift is monitored with a level or laser
• Adjacent panels are watched so the slab comes up evenly rather than tilting
• Ports are patched with cement grout — visible on close inspection, but far less so than mudjacking holes
• The surface is generally ready for foot traffic almost immediately and vehicles the same day

Reasonable expectations: lifting closes trip hazards and restores drainage fall. It will not make old concrete look new, and existing cracks remain existing cracks — they may open or close slightly as the panel moves.