Foundation stabilisation — also known as soil stabilisation — is the process of treating the ground beneath your home's footings to stop it moving. It's foundation repair at a broader scale — not a targeted fix for one corner that's dropped. A broader treatment for homes where the movement is widespread — affecting an entire elevation, sometimes multiple sides of the building.

The cause is almost always reactive clay — soil that swells when wet and shrinks when dry. Every season the clay moves, and every time it moves, it takes your footings with it. Wall cracks widen, doors stick, floors shift. It's not a one-off event. It's cyclical — and it keeps happening until the clay is treated. That's the part most homeowners don't realise. The footings are fine. The clay beneath them isn't.

Modern foundation stabilisation uses GeoPoly™ GER60 expanding geopolymer resin injected through coin-sized holes around the footings. The resin fills voids, blocks rainwater channels within the clay, and compacts the soil through its expansion force — locking the clay into a solid mass with greater load-bearing strength than soil alone. As the resin expands, it physically lifts the foundation. The seasonal movement stops.

Reactive clay doesn't just move once. It heaves when wet, contracts when dry, and does it again next season. Every cycle puts stress on the structure above — walls crack, doors jam, floors slope, and gaps open between walls and ceilings. Unlike isolated subsidence where one section drops, reactive clay movement is bidirectional and widespread.

Foundation stabilisation locks the clay in place so the ground beneath your footings stops shifting with the seasons. As it stabilises, you'll notice cracks stop appearing, doors start working again, and the house feels stable — and the foundation stays solid.