Mainmark specialises in relevelling slabs and structure. Level correction not only relevels a building, but also strengthens any weak ground under and around the perimeter of the foundations, ensuring a stable base and helping to avoid any recurring sinking issues. 

warehouse interior

There are many different causes of subsidence and various contributing factors. All involve some sort of change in the ground, which, in turn, generates movement of the soil. For example, droughts dry the ground, resulting in the soil (especially clay) contracting. Seismic activity shakes the ground, often resulting in liquefaction which ‘squeezes’ liquid up from the ground. Excavation and construction, even heavy traffic and machinery vibration, can move, displace and alter the condition of the ground. As well, different types of ground are more affected by different conditions. For example; clay is particularly prone to contracting in drought conditions, gravel and stony grounds can be more affected by nearby excavation, and excess water has a softening effect on dirt. Subsidence can happen over large areas of land or in a small targeted area. It can occur over a lengthy period of time, or can be an immediate reaction to nearby activity or natural events. When ground has been affected, building subsidence is common. Foundations or footings are no longer ably supported, sinking due to weak ground.

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

The only way to fix sinking concrete floors is to raise foundation, re-level and re-support the building. Mainmark specialises in concrete levelling. Traditional level correction or “underpinning” methods involve excavating or digging up parts of the foundation, pouring in concrete, waiting for it to set and then jacking up the building off the concrete blocks. It can be very time consuming and messy.

Mainmark provide friendlier solutions, both to the building and to those that occupy it. Our non-invasive concrete relevelling techniques are cost and time efficient, giving any sunken building a new lease of life. Mainmark’s level correction methods which include concrete floor lifting and ground relevelling are effective on buildings of any size.

Benefits of Mainmark’s level correction methods:

  • Fast, non-invasive and an overall cleaner alternative to traditional underpinning
  • Suitable for a broad range of buildings and assets from warehouse slabs, houses, highways, rail lines to airport runways
  • Is Fast – Economical – Permanent
  • Is accurate to within a few millimetres.
  • Environmentally responsible methods and outcomes
  • 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 vibration and little or no mess or extraneous water
  • Buildings can remain occupied during the re-levelling work