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Frequently Asked Questions


Our company

Mainmark is the most experienced ground engineering and asset presentation company, specialising in ground improvement, level correction and void filling. With global reach and local kiwi expertise, our capabilities apply to residential and commercial 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. Our methods are some of the most reliable, practical and least disruptive ways of re-levelling buildings.

Mainmark Australia and New Zealand has an Accredited integrated Management system meeting the requirements of ISO 9001:2015 Quality, 14001:2015 Environmental and ISO 450051:2018 Occupational Health & Safety Management Systems

Mainmark has been a proud member of the Master Builders Association in several states of Australia and in New Zealand since 1993. In New Zealand, Mainmark’s methods are cited within the MIBE Guidance Document (refer MIBE Document, appendix A1, pages A1.8 am A1.12), comply with council consent requirements and insurable. Many earthquake affected structures (homes, offices and utilities) in Christchurch have been re-levelled by us.

How many projects has Mainmark completed?

With a global footprint across and over 250 staff worldwide, Mainmark has completed over 80,000 jobs.

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.

What is Terefil®?

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

What is JOG?

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

What is Permeation Grouting?

Permeation Grouting creates ground cohesion before excavation. It helps strengthen sands and gravels, and repairs structural formations in noncohesive soils at depths as great as 60m. The process produces a solidified mass to support increased load and fill voids in the soil.

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 groundfilling holes, voids and pipesearthquake remediation, and revitalising ageing infrastructure.

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.

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

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