Sinking Floors


Sinking Floors

Sinking floors can be a sign of subsidence and issues with house foundations.

When it comes to the main structural aspects of a property, it is essential they are looked at as soon as a problem arises – to avoid foundation collapses from weak voids.

A building can sink at various points or in the worst circumstances can affect the entire foundation.

With Mainmark’s range of effective solutions, we can work with you to make the whole process less stressful allowing you to live happily in your home again.

What does a sinking floor mean?

Concrete floors within a home can sometimes suffer subsidence, which is the sinking of the concrete due to movement of foundation ground.

A building can sink at various localised points or can be spread across the entire footprint of the house foundation, depending on where, and the size of the affected area.

Subsidence, if left untended can be a very serious problem, which is likely to worsen, creating further sinking floors, wall cracks or other significant building damage.

What are the likely causes of subsidence?

Some homes are at a greater risk than others when it comes to subsidence. There are also many geological, man-made and seasonal impacts that can make your home more likely to experience a problem.

Some include:

  • Clay soil can shrink, crack and shift during hot, dry weather, and then expand during periods of heavy rainfall, making the ground very unstable and can potentially cause sinking foundations.
  • After a drought, sandy or fine gravel soil is much drier, causing it to move which can impact building footings
  • Trees and shrubs can also be a factor, particularly if they’re close to property foundations. Some species absorb a lot more water, making the soil much drier.
  • Older properties may have shallower foundations.
  • Local mining activity is another major risk factor. Similarly, former quarry or pit sites can cause instability as fill material decomposes.
  • Leaking drains and water mains can wash away or soften soil, causing it to compact under the weight of a home.
  • Water flooding the ground causing saturated house foundations and in turn movement.
  • Washaways from broken pipes (such as water, sewer, stormwater drainage).
  • Liquid, gas or mineral resources being removed from the ground affecting stability.
  • Erosion, earthquake and other geological activity
  • Vibrations caused by heavy road traffic, machinery or nearby excavation
  • Deterioration of retaining walls

How Mainmark can help fix the problem?

Mainmark’s ground improvement and concrete floor re-levelling methods for house subsidence are effective for fixing sinking floors in homes of any size.

The Mainmark team of experts will visit your home, assess the damage, and ascertain the cause. Our experienced engineers and technicians establish the underpinning approach needed, creating a plan specific to the needs of your home.

Our cutting-edge solutions are the modern answer to traditional concrete underpinning and are likened to keyhole surgery.  Our non-invasive, clean and time-efficient floor fixing solutions are not just for concrete slab floors; we can raise and relevel strip footings, a range of slabs and we can re-level paths and driveways too.

This house lifting, and re-levelling eliminates the need and the cost of ripping out and replacing the floor or demolishing and rebuilding brickwork walls, restoring value to the home. The work is carried out with the minimum of disruption to the occupant. In many cases the occupant can remain in the home.

As opposed to more traditional methods of underpinning buildings, our resin injection methods are quicker and, in most cases, done from the outside using 16mm diameter tubes and if interior injection is required only a 6mm tube is used. The size of the tubes means that there is minimal intrusion into the property.

Benefits of Mainmark’s methods:

  • No mess –  there is little if no dust, water, or anything else to clean up
  • There is minimal disruption to the home owner
  • We don’t cause further damage to the house or garden
  • With simple jobs, residents can stay in the home and may not even need to move much furniture
  • Techniques are non-invasive: floors are not taken up or grounds excavated
  • Many simple, residential jobs are completed in just a day
  • The products and techniques we use have no negative impact on the environment

Our methods used on homes:

Mainmark’s new engineered resin injection solution

For more than 20 years, Mainmark has led the world offering some of the most advanced resin injection and grout solutions. Teretek from Mainmark is a proprietary solution that utilises an injection delivery method developed by Mainmark to raise, re-level, and re-support buildings and other above-ground structures.

Teretek engineered resin injection solution can help solve problems such as sinking and cracked floors, cracked walls, or doors and windows that won’t close properly, before they escalate.

Advanced and Proven Technology for Re-levelling Large and Complex Structures

JOG Computer-Controlled Grouting is an award-winning grouting technology for strengthening ground beneath larger homes and residential buildings, using cement grout injection under integrated computer control. It is an extremely precise method for stabilising soils, consolidating weak ground and lifting foundations to deliver specific, engineered outcomes, regardless of complexity.




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

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