{"id":44,"date":"2026-10-05T16:00:00","date_gmt":"2026-10-05T16:00:00","guid":{"rendered":"https:\/\/division7.ca\/blog\/?p=44"},"modified":"2026-10-01T14:27:18","modified_gmt":"2026-10-01T14:27:18","slug":"concrete-slab-lifting-polyurethane-slab-jacking-bc","status":"publish","type":"post","link":"https:\/\/division7.ca\/blog\/concrete-slab-lifting-polyurethane-slab-jacking-bc\/","title":{"rendered":"Concrete Slab Lifting: How Polyurethane Slab Jacking Works"},"content":{"rendered":"

Polyurethane slab jacking, sometimes called concrete lifting, raises a settled slab by injecting expanding foam through small drilled holes beneath it. The foam spreads into available voids and exerts controlled upward pressure. It can be a practical repair for some settled sidewalks, driveways, garage floors and similar slabs, but the right solution depends on why the concrete moved and what lies beneath it.<\/p>\n

How the repair works<\/h2>\n

The contractor first reviews the slab, identifies low areas and checks for cracks, drainage issues, buried services and access constraints. Small injection ports are drilled through the concrete. Foam is injected in stages while elevations are monitored, allowing the crew to lift the slab gradually. After the ports are patched, the surface can often return to service sooner than with full replacement, subject to product and project conditions.<\/p>\n

When lifting may be suitable<\/h2>\n

Lifting may be considered when the slab is generally intact, settlement is localized, and the underlying cause can be managed. Filling a void and restoring a more even surface can reduce trip hazards and improve drainage at the slab. It is often less disruptive than removing and replacing concrete.<\/p>\n

It may not be suitable for concrete that is extensively broken, badly deteriorated or moving because of an unresolved structural or drainage problem. Foam cannot repair a failed retaining wall, stabilize every type of soil movement or correct poor site drainage by itself. A contractor should explain what the proposed repair can and cannot address.<\/p>\n

Questions to ask before work begins<\/h2>\n