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Frequently Asked Questions


Our company

As a proudly Australian privately owned family business, Mainmark is the most experienced ground engineering and Asset presentation company, specialising in ground improvement, level correction and void filling for almost 30 years. With global reach and local expertise, our capabilities apply to residential, commercial, infrastructure and mining sectors.

Why choose Mainmark as your preferred geotechnical expert?

Mainmark offers unique, innovative solutions for rectifying problems with foundation ground in residential, industrial, commercial, heritage and civil engineering situations. Mainmark has also led the world in developing and offering the most advanced and accurate systems in ground engineering and asset preservation.

How many projects has Mainmark completed?

With a global footprint, 18 offices and over 250 staff worldwide, Mainmark has completed over 82,000 jobs across the residential, commercial, infrastructure and mining sectors.

Are our products safe and environmentally friendly?

Our methods are environmentally inert, and have no detrimental effects on the environment.


Our technologies

What is Teretek?

Our Teretek® technology provides a solution to address subsided structures, improve ground, and fill voids.

Re-levelling: Using our specialised expanding resins, Teretek® is a reliable method to lift and level structures.

Ground Improvement: Teretek® is used to deliver ground improvement solutions beneath existing structures.

Void Filling: Teretek® is well-suited for addressing smaller voids found under concrete slabs.
Learn more about Teretek

What is Terefil®?

Our Terefil® technology provides an advanced lightweight cellular concrete for soil replacement, large void filling, and pipe abandonment.

Advantages of Cellular Concrete: Cellular concrete stands out for its unique properties, catering to a wide spectrum of applications.

The Fluidity Factor: One of the standout attributes of cellular concrete is its high fluidity. This material can be pumped over long distances, filling gaps, trenches, or voids.

Soil Replacement: In a ground improvement application, Terefil® is used to create a lightweight raft prior to building construction.

Learn more about Terefil

What is JOG?

Our JOG technology is a state of the art, computer controlled, multipoint injection system.

Where Technology Meets Grout Injection: The technology uses cementitious grouts with controlled set time structures, from residential homes to large commercial buildings.

How JOG Operates – Coordinated Precision in Action: JOG operates through a sophisticated system of interconnected injection ports, managed and sequenced by a central computer.

Learn more about JOG

What is Permeation Grouting?

A Non-Disruptive Alternative To Traditional Underpinning in Sandy Soils.

Stabilising granular soil prior to planned excavation and increasing the bearing capacity of the treated zone, it fills the voids between the soils and bonds the particles together. This creates a solidified mass that can support increased load, stabilise sunken structures and create temporary shoring solutions.

Learn more about Permeation Grouting

What is Jet Grouting?

Jet Grouting is accomplished with high pressure, high velocity jets located in a grout monitor attached to a drill stem. It uses a complex process of water-jetting and slurry jetting which produces an end result of ‘soil-crete columns’ with high strength and low hydraulic conductivity.

What was the Uretek method?

The Uretek ground engineering and grout technologies were based on the expansive power of multi-component mixtures of structural geopolymer resins and hardeners.

In the past Mainmark used the *Uretek resin injection methods. This expanding resin was primarily a slab lifting technology and had been used extensively for raising, re-levelling, re-supporting and strengthening moving and sunken structures on or in the ground.

Building on our experience of raising, re-levelling and re-supporting structures and correcting foundation ground issues, combined with our knowledge of the unique local conditions, Mainmark developed our proprietary Teretek resin injection solution.

What type of structures can Mainmark technologies be used for/on?

Mainmark methods provide ideal ground engineering and asset preservation solutions for numerous structures, of varying size and type, including residential, commercial, infrastructure, heritage, civil and mining projects. We offer methods such as level correction of sinking floors and buildings, strengthening weak and unstable ground, filling holes, voids and pipesearthquake remediation, and revitalising ageing infrastructure.


General Questions

How does Mainmark help to bring the house or building back to level?

Our technicians establish the best approach to raise and re-level your home, creating a plan that addresses the identified ground conditions. Laser levels are used to carefully monitor progress and determine the amount of lift required.

Will there be disruption or mess at my property?

Our level correction methods involve very minimal disruption to your property. Similar to keyhole surgery, Teretek resin is usually injected through tiny holes around 16mm in diameter, and as small as 6mm if applied inside the house.

What if I have a tiled or timber floor?

We position holes as unobtrusively as we can, for instance beside or beneath a skirting board, where possible. These tiny holes are practically unnoticeable if they are filled with a small wooden plug or drilled through the tile joints.

Does my carpet need to be removed?

If carpet is present in the room, it would need to be rolled back from the affected area. Most often, it can simply be loosened from the tack strip along the wall.

What happens to the out of level floor?

Mainmark endeavours to re-level floors. However, there are times and conditions when lifting may damage the structure. In this case, Mainmark raises the floor to the extend that conditions allow and focuses on ground improvement to mitigate future settlement.

What do I need to do before Mainmark commences its work?

One of our experienced ground engineering specialist will assess your site including the surrounding soil and advise what is required, providing a detailed scope of works in the quotation documents. Service location is required on all properties to mitigate the risk of Teretek material affecting in-ground services. Damaged plumbing is often part of the cause of settlement, subsidence and cracking. When this is identified, Mainmark recommends the plumbing is repaired before the works commence. Tree roots are also often a cause of foundation problems. In some instances, Mainmark may recommend that root barriers be installed or trees are removed. This can be done either before or after treatment. Finally, Mainmark rigs will require parking at the front of your property for access on the day.

Do you provide a warranty?

The materials we use have been developed for underground use and are engineered to resist shrinkage and deterioration. Teretek resin materials are warranted by Mainmark for an industry-leading 20 years in United Kingdom.

How do I know if I’m getting value for money?

Mainmark does not offer a ‘one size fits all’ solution. We assess each property in person to ensure a bespoke solution is developed for each home. We provide a comprehensive estimate of the materials required, how much time the job is likely to take, and are available to answer any questions along the way. Our experience working in many different environments, often in the same suburbs as the home requiring work, helps us to advise on the expected outcome of the work based on the type of house and the soil conditions in the area.

What should I do to best manage my house into the future?

Mainmark recommends strict adherence to the provided CSIRO information ‘Foundation Maintenance and Footing Performance: A Homeowner’s Guide’, including attention to adequate surface drainage, maintaining water services, removal of tree roots etc.

Our Process – Level Correction
How does Mainmark address level correction?

Using advanced technologies and methods which include Teretek ResinTerefirm ResinJOG Computer-Controlled Grouting and Jet Grouting. Mainmark is able to correct ground subsidence and get your property back to level.

What process does Mainmark employ to ensure that the slab is raised to an even, level plane?

Employing laser devices, and other computer or technological controls, our technicians use sophisticated procedures throughout the process to carefully monitor and govern the amount of slab lift.

How much can Mainmark technologies lift?

Theoretically there is no limit to the amount of lift possible. Our technology has been used previously to lift structures from 1mm to 1300mm!

How long does it take to re-level or lift a structure?

Depending on the situation and methods used, most projects often can be re-levelled within a few hours, a few days or up to a few weeks.

Our Process – Weak or unstable ground
How does Mainmark address weak or unstable ground?

Using advanced technologies and methods which include Teretek ResinUretek Resin, PowerPiles and Jet Grouting. Mainmark is able to rectify your soil stabilisation and ground compaction issues.

What structures that have weak or unstable ground can this technology be applied on?

Majority of on-ground structures including buildings, concrete floors, driveways, roads, paved airport runways and more.

Our Process – Holes and void filling
How does Mainmark address holes and voids?

Using advanced technologies and methods which include Teretek Resin, Permeation GroutingTerefil® and Uretek Deep-Injection. Mainmark is able to fill your holes and voids and stabilise the surrounding structures.

What applications can void fill method be used on?

Generally any structure or foundation that needs filling or stabilising which include:

  • Decommissioning culverts, pipes and tunnels
  • Mass fill for large voids, tanks, sink holes and abandoned mines
  • Bridge approach
  • Landslip repair
  • Retaining wall and wing wall backfill
  • Services trench and manhole backfill
  • Permeable sub-grade beneath roads and sporting facilities
Our Process – Earthquake remediation
How does Mainmark address ground subsidence caused by earthquakes?

Using advanced technologies and methods which include Teretek ResinUretek ResinJOG Computer-Controlled Groutingand Jet Grouting. Mainmark offers the world’s most advanced earthquake remediation, liquefaction mitigation and ground-strengthening technologies.

What experience does Mainmark have with earthquake-related level correction?

In short, a lot. In the past five years, we have level-corrected over 500 projects damaged by the Christchurch quakes. Prior to this Mainmark has worked on earthquake-specific repairs since 1989.

Our Process – Asset preservation
How can Mainmark’s asset preservation solutions cater to your work site needs?

Mainmark specialises in advanced, site-specific solutions for revitalising, sealing, protecting and structurally reinforcing ageing or damaged buildings and infrastructure including tunnels, shafts and basements impacted by weak ground and water ingress.

This business unit also facilitates the location of underground services on residential and commercial job sites.

What solutions can Mainmark provide to revitalise ageing and decaying infrastructure?

Linings and Coatings – Our innovative range of protective resin and gel coatings provide exceptional environmental, chemical and abrasion resistance to protect the long-term structural integrity of civil infrastructure and building assets including manholes, tunnels, lift shafts, pipes, tanks, drains and basements.

Water Mitigation and Control – Mainmark has a range of high-performance water mitigation and control solutions for all types of works, such as below-ground carparks, basements, tunnels, retaining walls, dam walls and other subterranean infrastructure, including for emergency situations.

Concrete and Steel Rehabilitation – The products Mainmark uses are engineered to site-specific requirements and have been proven to chemically bond to concrete surfaces in the most challenging environments with exceptional adhesion capabilities. A range of pure polyurea and polymer coatings permeate, fill and stabilise both large and small areas to address leaking, cracking and surface deterioration.

Other Resins – Mainmark can use a variety of tested and proven specialised engineered resins to bind weak strata and fill voids, crevices, and large cavities in civil and mining applications.

What solutions can Mainmark’s service location provide?

Mainmark’s Service Location team supports utility and asset owners, property owners and managers, building professionals and trades, engineers, consultants and civil construction companies and homeowners by providing an understanding of underground services with detailed and accurate location mapping and reporting.

Need help?

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© 2024 The Mainmark group of companies. ‘Mainmark®’, ‘Terefil®’, ‘Terefirm®’ and ‘Teretek®’ are trademarks of the Mainmark group of companies.

Mainmark Ground Engineering (UK) Ltd.

CRN: 09372443

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