Your floor is formed from three main elements: floorboards on top, joists running underneath, and bearers spanning between piers. Most homeowners assume the problem is in one of these — a warped joist, a rotted bearer, a cracked board. Nine times out of ten, it's none of them. The real problem starts below floor level, in the ground.

For timber floors to remain level, the ground beneath the piers must remain stable. When soil shifts — from reactive clay shrinkage, poor drainage, tree roots, or natural consolidation — the piers sink and the floors slope with them. Replace the piers and the new ones sit on the same unstable ground. Fix the ground, and the existing piers go back where they belong.

Modern floor levelling works by injecting GeoPoly™ PSR30 expanding resin beneath the existing piers to fill voids, compact the weakened soil, and gradually lift each pier back towards level — all controlled in real time with laser monitoring.

Floor piers carry the full weight of your floors — bearers, joists, floorboards, internal walls, furniture, and the people walking across them. When the soil beneath a pier settles, compacts, or washes away, the pier drops and everything above it follows. That's when the floor starts to slope.

There are two ways to spot sinking piers. You can feel it: a dip underfoot, bouncy floorboards, doors that jam or won't latch. And you can see it: diagonal cracks in gyprock near door frames, small objects rolling to one side of the room, gaps opening under skirting boards, and cracks appearing in cornices. If any of these sound familiar, the piers have likely moved.