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Slab lifting

Why is slab lifting in commercial buildings required?

Sunken or unlevel slabs and hardstand surfaces in warehouses or logistics environments can be a sign of foundation ground subsidence.

Sunken or uneven concrete slabs can be a trip hazard. They can also cause water to pool in certain areas, further increasing the risk of slips and falls for staff and the public.

If the area is a hardstand for plant and equipment, uneven floors can result in machinery becoming unlevel or misaligned. This can create significant issues around machine maintenance and performance; some sensitive machines can start producing faulty outputs, and it could even void the machine’s warranty.

What causes concrete slabs to sink?

Over time, as the ground beneath slabs compresses or expands due to changes in ground moisture levels, the weighted concrete slab above will start to subside at different points.

There are many different causes of sinking slabs, including:

  • Extreme weather conditions that cause reactive clay soil to contract or expand
  • Highly trafficked areas where excess weight and movement loosen sandy or fine particle soil
  • Ponding slabs where excess water was used to cure concrete in small areas
  • Nearby excavations that cause the ground to vibrate
  • Poorly compacted soil during the construction of the building
    Incomplete or inadequate foundations or footings

Common indicators of an unlevel slab are misaligned joints between slab panels and soil being pushed out as weight presses down on the slab. Left untreated, the lack of support under the panel can cause slab cracking and uneven surfaces.

Slab lifting with minimal disruption

Mainmark’s modern slab lifting and re-levelling technologies are reliable, quick and cost-effective. Our methods are flexible, minimise disruption on site and can be scheduled around other trades. Work can also be completed much faster than with traditional methods of slab lifting.

Our non-invasive slab lifting technologies allow building occupants and contents, including plant and machinery, to remain in place. Most of the time, the facility can remain operational.

Treated roads, driveways, airport runways and concrete slabs are trafficable immediately.

Mainmark slab lifting technologies

Teretek® – slab lifting with resin injection

Teretek® resin injection technology can provide ground improvement beneath existing structures. We drill small holes through the ground-bearing slabs or the foundations in the deteriorated soil strata underneath. These holes are then used for injecting our specialist resin formula, compacting the ground, lifting concrete slabs and re-levelling sunken and cracked concrete floors.

JOG Computer-Controlled Grouting for slab lifting

JOG Computer-Controlled Grouting uses a high-mobility cementitious mix. This mix is pumped into multiple injection depths during a meticulously monitored process that deploys laser sensors and computers. This is a precise method for consolidating weak ground and lifting slabs; it delivers specific, engineered ground improvement outcomes, regardless of project complexity.

Why Choose Mainmark?

Delivering exceptional outcomes to our
clients, partners and team


Our world-leading ground engineering technologies achieve safe, accurate and economically delivered outcomes. We understand that ground engineering can be complex and no single method suits every project. We work with our clients and partners to recommend the right solution for each challenge.


Mainmark ground improvement solutions have been proven for over 30 years. Our ground engineering specialists have worked on over 30,000 projects worldwide, from straightforward residential subsidence to post-earthquake remediation in Japan and New Zealand. We aim to be the best at solving your ground problems with minimal disruption.


Our experienced team has a wealth of knowledge in residential, commercial and industrial buildings, as well as highways, rail, utilities and infrastructure. Our ground engineers can raise and re-level buildings, providing support and improving ground performance.


The combination of our proven ground improvement technologies and our experienced ground engineers enables us to re-level and re-support buildings affected by subsidence across various sectors.


Our problem-solving approach and recommendation of ground engineering solutions sets us apart from the competition. The complexity of ground improvement requires a range of state-of-the-art technologies to meet both project and client requirements.


We are trusted to present effective and creative solutions to many types of ground engineering problems in a wide range of sectors, including residential, industrial, commercial, civil engineering and infrastructure.

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Mainmark Ground Engineering (UK) Ltd.

CRN: 09372443

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