Camp Hill Fire Station sits on Ferguson Road in Brisbane’s inner south-east. Every call-out starts the same way: a fire truck carrying its own water tanks — around 14 tonnes fully laden — rolls out across the driveway slab. Station management could see that slab flexing under each truck and called Buildfix for a concrete relevelling assessment.

The slab had sunk far enough that a steel ramp had been added to bridge the drop at the door. Every truck crossing it took a knock, adding wear to the fleet. And after rain, the voids under the slab filled with water — each truck that crossed it jetted mud over vehicles and anyone standing nearby, for days afterwards.

A fire station doesn’t close for maintenance. Response times are measured in seconds, and the driveway is the one piece of concrete every truck has to cross. Whatever the fix, trucks had to keep rolling in and out through the works.

The conventional fix — cut out the slab, re-pour, wait for it to cure — would have put the driveway out of action for weeks. And the slab itself wasn’t the problem. The ground beneath it had washed out, and a new slab on the same ground would flex the same way.

The repair also had to carry a serious load. Not a car, not a delivery van — a laden fire truck, every day, for decades.

Technicians drilled injection ports through the slab on each side of the station and delivered GeoPoly™ SJ120 into the soil beneath at depth — filling the voids and compacting the ground that had been washing out. Once the ground was stable, further injections lifted the slab back to level, monitored throughout on Hilti vertical displacement lasers.

One side at a time, a day each. The station kept operating throughout — no interference with the crews, no delayed response times.

GeoPoly™ is formulated and made by Buildfix. By the time the surface drill holes had been sealed with structural grout, the resin had already cured to full load-bearing strength.

The test was the real thing: a fully laden fire truck driven over the treated slab with the Hilti lasers watching. Zero deflection measurable. No flex, no ramp, no mud.

Two days of work in total, one per side, and the station never went offline. Every GeoPoly™ repair is backed by a written 20-year product and workmanship warranty.

Got a slab that's flexing under load — a driveway, a loading dock, a warehouse floor? A free site assessment measures the levels and explains what concrete relevelling can do for sunken concrete without closing the site.