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Quick Enquiry

Submit your enquiry using our online form and include a brief message about the type of issues you are experiencing. One of the Mainmark experts will contact you as soon as possible.

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Sinking Floors & Slabs

A Sign Of Subsidence

What does a sinking floor or concrete slab mean?

Sinking concrete floors or slabs are an indication of building subsidence

Our bespoke solutions for slab lifting and re-levelling methods address the underlying subsidence problem by strengthening the ground beneath.

Our level correction methods can cater to any building size, from homes and driveways to warehouses and transport yards, and are non-invasive, cost-effective, and time-efficient, with minimal disruption to the occupants.

Fast, clean and non-invasive lifting of sinking floors and slabs


Residential Sinking Floor & Slab

Our Teretek® Resin Injection technology can raise, re-level and re-support sinking floors and slabs.

Watch how our non-invasive, cost-effective technology raises and re-levels a sinking residential internal floor and external concrete slab.

Sinking Floor & Slab Repairs

Before & After Treatment

Houses that need to be re-levelled often experience internal and external sinking floors and slabs.

These houses require their foundations to be re-levelled.

Mainmark’s non-invasive and cost-effective solutions can raise, re-level and re-support your home. Our innovative methods minimise site disruption and are completed within one day.

Features & Benefits

Mainmark’s Solutions & Technologies


Our technologies have fast curing times and treated areas can be used immediately or without the delays compared to traditional repair methods.

Environmentally Inert

Our technologies use an inert material that is non-toxic and does not leach into the environment or affect the treated area.


Our solutions are of surgical nature compared to traditional methods.


Compared to traditional methods, our solutions are more cost-effective, with minimal disruption to the area.

External Sinking Floors or Slabs

Outside Your Home

You may also notice sinking or gaps in concrete slabs outside your home, such as in your driveways, paths and patios.

If these outdoor areas are experiencing sinking, it could also indicate deeper issues underground.

The risks outside can vary, but include damage to underground wiring or services, drainage breaks or leaks, and other safety hazards. 

Re-levelling your concrete here is key to ensuring a safe, functioning, and aesthetic outdoor space.

What causes sinking floors and slabs?

There are many different causes of subsidence and various contributing factors.

All involve some change in the ground, which, in turn, generates movement of the soil.

As well, different types of ground are more affected by different conditions.

When ground has been affected, building subsidence is common. Foundations or footings are no longer fully supported, sinking due to weak ground.

Soil Types

Moisture levels in the soil affect reactive clays as they expand and contract.

Oversaturated clays lose their strength resulting in footing subsidence. In loosely packed soils, such as sand and silt, the fine particales in the soil can wash away causing the footing to settle.

Tree Roots

Neighbouring trees and shrubs absorb water using their roots causing movement in the soil as it soaks up moisture in the ground.

Footing Systems

Poor foundation design or inadequate compaction of soil during construction results in movement of the structure as it settles.

Excess Water

Burst or cracked water pipes including blocked sewage and rain gutters  can oversaturate clay soils or wash fine particles from sand and silt soils and cause footings to subside.

Extreme or Seasonal Weather

Natural disasters such as flooding, drought and earthquakes affect soil moisture levels in particular clay resulting in excessive foundation movement.

Renovation or Construction

Vibration caused by nearby construction activity such as drilling or piling, or heavy road traffic causes soil particles to shift and settle, resulting in ground subsidence.

Get a quote

Arrange a site assessment in 3 simple steps:

Step 1

Submit your enquiry using our online form. Include a brief message about the type of foundation issues you are experiencing.

Step 2

Our friendly customer service team will be in touch to schedule a site assessment that suits you.

Step 3

One of the Mainmark experts will visit your home or property, assess the damage, and ascertain the likely cause. They will establish the approach needed, creating a plan specific to the needs of your building and provide you with a detailed quote.

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© 2024 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.

Mainmark Ground Engineering Pty Ltd
ABN: 51 606 182 503

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