Our Technology
GeoPoly™ SJ120
Geopolymer resin that lifts sunken concrete slabs, driveways, paths, and pool surrounds — through coin-sized holes, in hours. Walk on it the same day.
Our Technology
GeoPoly™ SJ120
Geopolymer resin that lifts sunken concrete slabs, driveways, paths, and pool surrounds — through coin-sized holes, in hours. Walk on it the same day.
The resin that relevels concrete without replacing it
GeoPoly™ SJ120 is Buildfix's slab jacking resin — a high-expansion geopolymer (that's what SJ stands for) injected beneath sunken concrete to fill voids and lift the slab back towards level. It's the technology behind Buildfix's concrete relevelling solution. Driveways, paths, pool surrounds, garage floors, internal slabs — if it's concrete and it's sunk, SJ120 can raise it. Through holes smaller than a two-dollar coin. Walk on it the same day.
The old approach? Jackhammer the slab, rip up tiles, dig out the base, repour, wait weeks for it to cure, then relay the surface. Massive cost, massive disruption, and the new slab sits on the same ground that failed the first time. GeoPoly™ SJ120 fixes the void beneath the concrete — not the concrete itself. The resin expands to 20 times its volume, sets in 2 minutes, and creates a permanent, load-bearing mass that holds the slab at its corrected level.
Concrete sinking? It doesn’t need replacing.
Get your slab checked out. It’s free, and you’ll know exactly what’s happening beneath the concrete.
Behind the performance
Tap any spec to learn what it means for your property.
Geopolymer Resin
Material
GeoPoly™ SJ120 is a geopolymer — not a polyurethane foam. It’s mineral-based, cures into a solid, rock-like mass beneath the slab, and won’t degrade, shrink, or wash away over time. That’s why the repair lasts.
Behind the performance
Tap any spec to learn what it means for your property.
Geopolymer Resin
Material
GeoPoly™ SJ120 is a geopolymer — not a polyurethane foam. It’s mineral-based, cures into a solid, rock-like mass beneath the slab, and won’t degrade, shrink, or wash away over time. That’s why the repair lasts.
See the difference
Real concrete. Real repairs. Lifted and relevelled with GeoPoly™ SJ120 resin injection.
Instant results.
Guaranteed to last.
What makes GeoPoly™ SJ120 different from concrete replacement.
GeoPoly™ SJ120 is a slab-specific formulation — injected beneath the concrete to fill voids, compact the soil, and lift the slab back towards level. Laser-monitored in real time for millimetre precision.
Want to see if GeoPoly™ SJ120 is right for your slab? Get your concrete assessed for free — we'll explain exactly what's happening beneath the surface.
Real homes. Real repairs.
Concrete slabs relevelled with GeoPoly™ SJ120 resin injection.
HomeownerLoganholme, QLD
Sinking Garage Lifted 45mm — Harleys and All
A garage sinking for over two decades on poorly prepared soil. GeoPoly™ lifted the slab 45mm in under four hours — the Harleys never moved.
HomeownerStrathfield, NSW
Heritage Home Repaired Twice, Same Team
When new cracks appeared in this 150-year-old Strathfield home, the owner didn’t hesitate — they called Buildfix again. Buildfix had already fixed the front of the house years earlier. This time, the team tackled the rear.
CommercialBrisbane CBD, QLD
Roma Street Parkland Walkways Relevelled
Sunken stairs, walkways, and bikeways across 16 hectares of public parkland. Brisbane City Council has used Buildfix to relevel affected sections.
HomeownerRaceview, QLD
Dining Floor Relevelled — Not a Tile Broken
A sinking dining room floor on reactive black soil — relevelled in one day through 1cm holes in the grout joints, without breaking a single tile.
HomeownerOrmeau, QLD
Pool Surround Relevelled — No Tiles Lifted
Sections of the tiled pool surround had sunk, creating uneven edges and a daily safety hazard around water. Relevelled without pulling up a single tile.
CommercialRunaway Bay, QLD
Sunken Tennis Court Lifted 100mm
A tennis court at a residential complex had dropped 100mm — a genuine trip hazard. GeoPoly™ lifted it back to level without reconstructing the surface.
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
“All of the Buildfix team have been easy to communicate with. Everyone was punctual and communicated arrival times well ahead of arrival.”
Scott HolmesMelbourne, VIC
Questions?
Our team is here to answer any questions you may have Monday – Friday 8am to 4pm AEST. Give us a call on 1300 854 115.
