Grout injection services

Grout injection is required when the ground beneath a structure is too weak, loose, or permeable to provide stable support.

Common applications include preventing settlement under buildings, reinforcing retaining walls, reducing water seepage through soil or rock, and stabilising ground before excavation or piling works.

This ground improvement technique is also recommended for heritage buildings where underpinning is needed without major disturbance.

The most suitable grout injection method depends on your ground conditions and project requirements. Common options include:

• Pressure grouting – grout is pumped under controlled pressure to fill voids, strengthen weak soils, and stabilise foundations. It’s commonly used for dams, tunnels, and deep ground stabilisation.
• Permeation grouting – a low-pressure method where thin grout flows into sandy or gravelly soils, binding particles together to increase strength without changing the soil structure.
• Water stop grouting – a specialised technique that creates watertight barriers by sealing cracks and joints in soil or rock, often used around basements, tunnels, and retaining walls to control groundwater flow.

Our geotechnical engineers can assess your soil type, water conditions, and design loads to determine which method will deliver the safest and most cost-effective result. Enquire now.

Grout injection is effective in many soil types, but the method must be matched to the ground conditions.

Permeation grouting works best in sands and gravels, pressure grouting suits fractured rock and voided soils, and water stop grouting is ideal for soils with high water flow.

Very dense clays may require alternative ground improvement techniques.

Grout injection can be carried out at almost any depth required for your site conditions. Whether the work calls for shallow treatment just a few metres below ground or extends much deeper, we have the capability to go as far as needed to achieve the best outcome.

The achievable depth depends on the chosen method, grout type, and site conditions. Pressure techniques are typically used for deeper stabilisation.

Yes. Grout injection is commonly used to repair and stabilise foundations affected by ground movement or subsidence.

By densifying weak soils and filling voids, it restores load-bearing capacity and reduces further settlement, making it a practical solution for both homes and commercial buildings.

When designed and installed correctly, grout injection can last for several decades. The lifespan depends on soil conditions, the type of grout used, and exposure to groundwater.

Cement-based grouts are highly durable, while chemical grouts are effective for long-term water control when properly applied.

The cost of grout injection varies depending on factors such as soil type, site access, grout material, and the scale of stabilisation required.

An on-site investigation and geotechnical design are essential to provide an accurate cost estimate tailored to your project. Enquire today to get started with RGE.

Yes. Our grout injection specialists operate across Australia. Enquire now to arrange grout injection services for your site.