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Slab lifting is the process of raising and re-levelling sunken or uneven concrete. It is commonly used for driveways, paths, garage floors, patios, pool surrounds and internal concrete floors. The aim is to restore support beneath the slab, reduce trip hazards and bring the surface back towards a safer, more level position.

Concrete slabs can sink when the ground underneath weakens, washes away or loses support. In New Zealand homes, this can be caused by poor compaction, soil erosion, water movement, drainage issues, voids beneath the slab or long-term ground settlement. If the slab is dropping, cracking or becoming uneven, it is worth arranging a professional assessment.

Yes, in many cases a sunken concrete slab can be lifted and re-supported without removing and replacing the concrete. If the slab is still structurally suitable, resin injection slab lifting can help fill voids, strengthen weak ground and raise the affected area back towards level with less disruption than replacement.

Slab jacking (also called concrete lifting or slab raising) is a method used to lift and re-support sinking concrete. Instead of traditional cement grout (mudjacking), Mainmark uses Teretek® resin injection, which expands to compact the soil and lift the slab without adding weight.

Concrete slabs typically sink due to soil erosion, voids forming under the slab, poor soil compaction, moisture changes, heavy loads, or long-term settlement. These conditions weaken the ground and cause the slab to drop unevenly.

Mainmark uses Teretek® engineered resin, which is injected beneath the slab. The resin expands to fill voids, strengthen weak soils, and lift the slab back to level. The process is fast, clean, non-invasive, and delivered with millimetre accuracy.

Slab jacking and concrete lifting are closely related terms. Both describe methods used to raise and re-support sunken concrete. Traditional slab jacking may use heavier cement-based grout, while Mainmark uses engineered resin injection to lift slabs through small injection points with minimal excavation, mess or downtime.

Resin injection involves placing engineered expanding resin beneath the sunken concrete through small holes in the slab. As the resin expands, it fills voids, improves support in the weak ground and can lift the slab back towards level. The process is targeted, fast-curing and designed to minimise disruption around the home.

Yes. Lifting a sunken slab is usually faster, cheaper, and far less disruptive than pouring new concrete. Replacement also doesn’t fix the underlying ground issues, while slab lifting addresses the cause of the sinking.

Most slab lifting jobs are completed in a few hours. There is no excavation, and the area can typically be used immediately after the work is finished.

Mainmark’s resin injection delivers long-lasting results because the resin strengthens the ground and stabilises the slab. The material is durable, water-resistant, and does not break down over time.

Yes. Slab lifting can remove trip hazards caused by uneven concrete, raised edges, or sinking slabs around driveways, paths, patios, and internal floors.

We raise, re-level and re-support:

• Driveways

• Footpaths

• Internal concrete floors

• Garage slabs

• Patio and pool surrounds

• Warehouse and commercial slabs

• Factory floors

• Hardstands

Any concrete slab that has sunk or become uneven can usually be re-levelled.

Costs vary depending on the size of the slab, the extent of sinking, access to the site, and what caused the settlement. Mainmark provides free site inspections to assess the issue and give an accurate quote.

No. Traditional mudjacking uses a heavy cement slurry, which can add weight and may cause further sinking. Mainmark’s Teretek® resin is lightweight, strong, fast-acting, and provides superior ground improvement and slab lifting results.

You should contact us if you notice:

• Uneven or sloping concrete

• Gaps between slabs and walls

• Cracks in the slab

• Trip hazards

• Sinking internal floors

• Water pooling where it shouldn’t

These are common signs of slab settlement.

No. Resin injection is non-invasive and does not require excavation, digging, or heavy machinery. Small injection points are used to treat the affected areas.

Immediately in most cases. The resin cures quickly, allowing normal use of the concrete soon after treatment.

Yes. Slab lifting can help reduce trip hazards caused by uneven concrete, raised edges, sunken paths, sinking driveways or dropped patio slabs. It is important to treat the cause beneath the slab, not just grind or patch the surface, especially if voids or weak ground are causing the concrete to move.

Slab lifting may help where the issue is limited to a concrete slab, but sinking foundations may require a broader foundation repair, underpinning or house re-levelling solution. Mainmark can assess whether the problem is slab settlement, weak ground beneath the foundation or a wider structural movement issue.