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
  • Erosion
  • 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.

Teretek® Engineered Resin Injection Solution is a hi-tech, advanced resin injection method that delivers re-levelling suitable for geotechnical issues across infrastructure, residential, industrial and commercial sectors. Small diameter holes are drilled through the ground slabs and foundations to allow injectors to be inserted. The Teretek® expanding resin is then injected through very small tubes, filling any voids which will strengthen the ground using the controlled force generated, re-levelling the structure.

JOG Computer-Controlled Grouting (or Integrated Computer Grouting) is a unique, multi-point cementitious grouting process used for level correction and stabilisation of structures, slabs and infrastructure. It involves rapid grout injection via multiple ports that effectively “floats” a structure back to level. JOG requires little or no excavation and is quick and accurate to within just a few millimetres. The building can also remain occupied during the remediation work.

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

Mainmark has been delivering ground engineering solutions globally for more than 20 years. To find out more about our advanced re-levelling methods, contact our experienced team.




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Mainmark United Kingdom
Unit 8,
6 Erica Road,
Stacey Bushes Industrial Estate,
Milton Keynes,
MK12 6HS,
United Kingdom

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