Subsidence Repairs for Homes | Underpinners

Helping to protect your biggest asset.

Mainmark has raised, re-levelled and re-supported homes and other residential buildings for more than 25 years, delivering successful solutions to thousands of properties. Our ground improvement and level correction methods can address foundation subsidence and are effective for helping to fix cracks in walls or re-level sunken floors in homes of any size. Our solutions are also used for slab lifting foundation slabs and large driveways.

✓ Cost effective – compared to traditional underpinning

✓ Non-invasive and clean – no major excavations with minimal disruption to residents

✓ State-of-the-art engineered solution – modern alternative to traditional underpinning

✓ Time Efficient – on average your home can be re-levelled in as little as a day

✓ All in one service – project manage all jobs from start to finish, no need to deal with external service location contractors

✓ Peace of mind – backed by an industry leading 50 year product warranty and a licenced builder that provides Home Warranty Insurance/Builders Warranty Insurance where required

How much does Foundation Repair Cost?

Get a FREE site assessment in 3 simple steps:

Step 1:

Submit your enquiry using our online form. Include a brief message about the type of foundation issues you are experiencing.

Step 2:

Our friendly customer service team will be in touch to schedule a site assessment that suits you.

Step 3:

One of the Mainmark experts will visit your home or property, assess the damage, and ascertain the likely cause. They will establish the approach needed, creating a plan specific to the needs of your building and provide you with a detailed quote.

Why take it from us, read what our customers have to say :

Customer Testimonials

computer screen with Typical signs of subsidence

Want to learn more about the signs of subsidence?

Explore our interactive house and view typical subsidence problems around your home

Sinking floors, paths and driveway slabs, cracked walls, jamming doors and windows can all be indicators of structural damage due to subsidence and voids under the ground. Typical causes are unstable or weak ground, a broken pipe causing soil erosion, moisture changes in clay soil, nearby building and excavation works, and seismic activity or liquefaction. Our solutions are cutting edge and the modern answer to the traditional way to underpin; they are like keyhole surgery compared to concrete underpinning. Our alternatives to underpinning are not just for concrete slab floors. We can underpin, raise and re-level strip footings and raft slabs, plus we can infill under slabs and driveways.

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How we get your home back to level in as little as a day.

Step 1: Our technicians drill small holes around the problem area

Strategically-placed injection holes are barely visible, with work typically carried out like key-hole surgery from the outside of the house through 16mm diameter tubes, reducing to as little as 6mm in diameter if applied from inside the home.

Step 2: Polyurethane resin is injected and lift is monitored

Teretek expanding polyurethane resin mix is injected through very small tubes into the ground of the affected area. Our technicians closely monitor the lift with real time laser level monitoring.

Step 3: Unique two-in-one solution improves ground bearing capacity and fills voids

When Teretek is injected into the ground it’s components mix together and expand by chemical reaction, which strengthens the ground, re-levels the building and fills voids quickly and with minimal disruption.

Step 4: Building is brought back to level, wall cracks close-up and floors are lifted

Benefits of Teretek:

✓ Ground beneath building is strengthened

✓ Soil is compacted

✓ Voids in the ground are addressed

✓ Your home becomes structurally sound, helping secure its future

Unlike many level correction processes, our methods are very resident-friendly.

	We use non-invasive techniques, likened to keyhole-surgery, so we don’t tear up floors and excavate ground (the injection holes can be as small as 6mm).
	We are very quick – many jobs are completed in a day.
	Residents can usually stay in the home and may not even need to move much furniture.
	We help strengthen the future of the house – the methods we use strengthen weak ground, so your home generally becomes level, crack-free and more stable.
	We don’t make mess – there’s no concrete dust, water or anything else to clean up.
	We don’t cause further damage; in fact cracks generally close up and windows and doors become usable.
	We provide peace of mind – our resin injection method is backed by an industry leading 50 year product warranty. We are also a licenced builder that provides Home Warranty Insurance/Builders Warranty Insurance where required.

We're happy to have helped

“S____ who was leading the Mainmark team onsite is a credit to your company. He talked us through the job, kept us informed of progress and spoke about issues along the way that he resolved in conjunction with your engineer. The team of 3 you sent were probably the most trustworthy, friendly and professional of trades we have come across. They were also respectful of the property and mindful of the need to keep the disruption to a minimum.”

Tim, Caulfield South, VIC. July 2021.

“B____ visited our site and was informative, thorough and helpful. On this particular occasion Mainmark was not able to assist with our problem. This was explained to me and I was directed to the appropriate engineering service. Very professional, would recommend.”

Michelle, Bayswater, Auckland, NZ. July 2021.

“The people we dealt with were polite, timely and kept us informed at all times. All questions we posed were answered without any hesitation They presented as true professionals, completed the work efficiently and left our property in a very tidy state.”

Ken, Boondall, QLD. June 2021

Start measuring wall cracks from the convenience of your home.

If you notice wall cracks around your home that are:

✖ Large cracks that start at windows, doorways or corners of buildings
✖ Cracks wider than 5mm
✖ Jagged, horizontal or vertical, zig-zagged, stepped in brickwork or follow mortar line

These characteristics may indicate weakness in your property’s foundation.

To help you discover if the cracks in walls around you home could be due to subsidence, we’ve developed this handy tool. Download our FREE crack gauge and start measuring and monitoring the wall cracks around your home now!

Download

The ground beneath us is constantly shifting.

Subsidence is the propensity for upward, lateral, or downward ground movement, which can result in structures moving, sinking in one area or across the entire foundation footprint.

Teretek Resin Injection

This method injects expanding structural resins into very small holes that have been drilled into the concrete slab. An irreversible reaction occurs as the injected material mixes, causing it to expand and set. The mixture fills any voids caused by unsettling, strengthening and compacting weak ground. Finally, the force generated by the expansion lifts the home where required. We utilise our proprietary engineered resin solution, Teretek, perfected by Mainmark after many years experience in fixing foundation ground issues and our knowledge of the unique local conditions. It has been used extensively in Christchurch earthquake repairs. Likened to keyhole surgery, this is a non-invasive, cost and time effective solution to get you back to level.

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Residential-JOG_Regents-Park-Int-Stations

JOG Computer-Controlled Grouting

JOG is a computer-controlled grouting re-leveling method that provides a very gentle lift, over large areas. A number of small holes are drilled, with grout delivered at multiple injection sites. Layers of grout are built up progressively to lift and ‘float’ the structure at specific points, bringing it back to level. JOG uses a computer-controlled system, delivering a continuous and balanced lift. The JOG method is a non-invasive solution for correcting subsidence of buildings, floors and other structures – it’s a time efficient and cost effective method.

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