Mainmark specialises in re-levelling slabs and structures to bring buildings back to correct levels and also strengthen any weak ground under and around the perimeter of the foundations. This helps to ensure a stable base and helps to avoid any recurring sinking issues.

What causes uneven buildings?

Uneven buildings are the result of weak ground that causes subsidence – the gradual downward movement of a building or structure due to changes in soil conditions.

There are many different causes of subsidence, including extreme weather conditions that cause the moisture content in the soil to contract or expand, nearby excavations that cause the ground to vibrate, poorly compacted soil during the construction of the building and incomplete or inadequate foundations or footings.

Subsidence can happen over large areas of land or in one small targeted area. It can occur over a lengthy period of time, or can be an immediate reaction due to nearby activity or natural events such as earthquakes.

When ground has been affected by subsidence, building foundations are no longer correctly supported, resulting in unexpected structural damage, such as sinking floors and cracks in the building walls which can all have a serious impact on the operations and safety of the building.

Likely causes of subsidence

Increased ground water content

Drought drying out soil

Washaways from broken pipes (such as water, sewer, stormwater drainage)

Poorly compacted fill

Liquid, gas or mineral resources being removed from the ground


Earthquake and seismic activity

Tree roots suck the moisture from the ground

Vibrations caused by heavy road traffic or by machinery

Absence of an organised footing system – in very old buildings or in buildings with additions or alterations

Adjacent excavation

Heavy loading

Deterioration of retaining walls

How Mainmark can help

The best way to fix sinking concrete floors or slabs is to raise and re-level the foundations to re-support the building or structure. Mainmark specialises in re-levelling using non-invasive techniques that are cost-effective and time-efficient, giving sunken buildings a new lease of life.

Our level correction methods replace traditional underpinning techniques that are time-consuming and messy, involving excavating or digging up parts of the foundation.

Benefits of Mainmark’s re-levelling methods

Fast, non-invasive and an overall cleaner alternative to traditional underpinning

Suitable for a broad range of buildings and infrastructure assets including warehouse slabs, houses, highways, railways and airport runways

Environmentally inert

Requires only small injection holes with little or no excavation or demolition

Induces no weakening of support or effect on adjacent structures

Produces no noise or vibrations

Buildings can remain occupied during the re-levelling work


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Holes and Voids

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