What is a void?

A void beneath your slab means the concrete is unsupported. This is a common issue in warehouses, factories, business, and retail properties where soil movement occurs, leading to serious operational risks and structural instability. We fill these voids without excavation or downtime.
Detail view of failed concrete slab creating uneven surfaces in factory

Details

Causes and symptoms of ground voids

Understanding the cause of a void is key to a permanent solution. Voids are often a hidden problem that only becomes apparent when a slab starts to fail.

Cracked and uneven concrete slabs with large steel plates covering to prevent trip and vibration hazards.

What are the signs of a void?

Hollow sounds when forklifts or heavy carts pass over an area

Noticeable vibration or "rocking" of a concrete slab panel

Sudden, localised cracking or sinking of the floor

Uneven slab joints that were previously level

Forklift carrying a load in a warehouse setting.

What are the most common technical causes?

Soil migration / washout

The most frequent cause. Leaking pipes, broken drains, or poor surface water management can carry away fine soil particles (silts and sands) from beneath the slab, leaving a cavity behind.

Ground consolidation

Poorly compacted fill material used during construction will slowly settle and consolidate over time, creating a gap between the underside of the slab and the ground.

Soil displacement

Heavy, repetitive loads (like forklift traffic) or vibrating machinery can slowly displace and compact loose soils, creating small voids that grow over time.

Our solution: The Geobear void filling treatment

Our void filling treatment is a precise engineering process. We begin by drilling a grid of small diameter holes through the slab into the target area.

We then inject a multi-component, hydro-insensitive geopolymer resin. This resin is specifically designed to:

Flow & expand: The material expands at a controlled rate, flowing to fill the entire void, even in complex shapes.

Repel water: Being hydro-insensitive, it displaces any standing water and is not affected by moisture, making it a permanent solution even in damp conditions.

Stabilse & support: It cures to be lightweight (so it doesn't add unnecessary weight to the weak ground) but has an extremely high compressive strength. It binds loose soil and provides durable, lasting support for the slab above.
3d model warehouse

Frequently asked questions about void filling

Our technicians are highly trained to monitor injection pressures and material volumes in real-time. The expanding nature of the geopolymer ensures it fills the entire cavity. We also use laser levels to monitor the slab and ensure it is fully supported without causing unwanted lift.

Yes. The cured geopolymer has a high compressive strength, specifically engineered to support heavy-duty industrial floors, machine bases, and high-traffic forklift areas. It restores the load-bearing capacity of the slab.

Yes. It is essential to repair the source of the problem (e.g., the broken pipe) first. Once the leak is stopped, our solution is ideal because our hydro-insensitive material will fill the void, displace any remaining water, and stabilise the water-logged soil to prevent future issues.

Disruption is minimal. The process is clean, quiet, and requires no excavation. The resin cures in as little as 15 minutes, so the floor can be trafficked almost immediately after we finish an area, allowing your operations to continue uninterrupted.

Mudjacking pumps a heavy, cement-based slurry, which adds significant new weight to the already weak ground and can shrink as it cures. Our geopolymer resin is lightweight and waterproof. It doesn't shrink and actively repels water, making it a more advanced and durable engineering solution.

Get expert advice on your ground voids

Don't let an underlying void compromise your floor slab. Contact our engineering team for a site assessment to diagnose the problem and provide a permanent solution.

Request a site assessment
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