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Subsidence cracks

What are subsidence cracks?

Subsidence cracks can appear in the walls, floor and ceiling of your home and are caused by the movement or shifting of the ground beneath the house’s foundations.

Subsidence cracks are often the first signs of subsidence that homeowners notice. Acting quickly when you spot them is critical for preventing additional damage to your home.

With over 25 years of experience in ground engineering globally, Mainmark offers quick, reliable and cost-effective subsidence treatments for residential homes. Our team can carry out surveys to:

  • Identify subsidence cracks
  • Examine other signs of subsidence
  • Diagnose the problem
  • Advise on the most effective subsidence solutions

If it’s determined that your home has subsidence cracks, our Teretek® resin injection and JOG computer-controlled grouting technologies can address the root causes of subsidence and give you confidence about the safety and stability of your home. We will recommend the most appropriate, cost-effective solution for the treatment of subsidence cracks and subsidence of your home.

Our modern subsidence treatment methods fill in the voids under the foundations of your home using cementitious grout or environmentally inert resin. This strengthens the ground underneath your home, gently brings it back to level and helps prevent any additional damage. The treatment is usually completed in a day. Once the subsidence has been dealt with, the subsidence cracks may close slightly but will need to be repaired and walls redecorated to make your home look like new.

Recognising subsidence cracks

How to recognise subsidence cracks

Cracks can appear in walls, ceilings and floors for many reasons, such as temperature fluctuations or structural issues unrelated to subsidence. Here are some key indicators to help you determine whether the cracks you are noticing are subsidence cracks.

● Location – Subsidence cracks often appear near doors and windows. They may travel in a diagonal direction and be visible on both the internal and external walls.

● Size – Subsidence cracks are usually wider than other types of cracks. They are usually at least 3mm wide and, in walls, they tend to get wider towards the top.

● Other signs of subsidence – These include uneven floors, windows and doors that are difficult to open and extensions appearing to separate from the main house. If you notice any of these, it’s likely the cracks are also from subsidence.

If you’re unsure if your home has subsidence cracks, it’s best to get expert advice. Subsidence isn’t a problem that can be ignored, and subsidence cracks can be your first warning that something is wrong. Mainmark’s experts can help you deal with subsidence cracks quickly and effectively.

Download our print at home crack gauge measuring tool

Need help with a project? Contact us today.


Mainmark technologies for remediation of subsidence cracks

Teretek® – Subsidence crack remediation through resin injection

  • Teretek® is an engineered solution for ground improvement and re-levelling subsided residential homes, using a plural component, expanding polyurethane resin. Teretek® works in a way similar to keyhole surgery. Small holes are drilled under the foundation in order for Mainmark’s proprietary, environmentally inert resin to be injected under the house foundation, improving the stability of the ground and re-levelling the home.
Teretek® resin injection technology

Subsidence crack remediation with JOG computer-controlled grouting

  • JOG computer-controlled grouting is a multi-point injection technique. This technology typically uses cementitious grout to re-level structures, including residential homes. This means that cementitious grout is injected under the foundations of your home, using computers to accurately control the injection amounts in the various predetermined locations.
JOG computer-controlled grouting

Mainmark technology benefits

Benefits of Mainmark’s subsidence treatments for subsidence cracks


Our technologies are installed quickly and can be walked on soon after.

Environmentally inert

We use safe materials that are non-toxic and do not leach into the environment or affect the treated area.


Our solutions are surgical in nature, causing minimal disruption to you or your family.


Compared to other solutions, our technologies cost significantly less.


We’re happy to have helped

Soil stabilisation FAQ’s
What happens with unlevel driveways, floors and hardstand areas?

After the application of the Mainmark solution, unlevel surfaces will become aligned again as the ground underneath is strengthened and re-supported. Simple cosmetic repairs may be required.

Will there be a mess?

Very little, if any. We use Teretek® engineered Resin Injection technology, which is likened to “keyhole surgery”, or JOG Computer-Controlled Grouting, with no major excavation and minimal disruption or mess. The injection holes required are very small.

How long does it take?

Each project is different and depends on the required amount of lift, area for correction, building construction, and ground conditions. Most projects can be completed in a day or two, and we can work at night or on one area at a time, so your business can keep operating.

Do i need to send my workers home?

No, most projects don’t require you to vacate the premises or even move furniture or equipment. For the most part, you can keep operating as normal. Driveways can often be driven on in as little as 30 minutes after treatment.

What warranty will I get?

The materials we use have been developed for use underground and have been specifically engineered to resist shrinkage and deterioration. Teretek® is warranted by Mainmark for an industry-leading period of 20 years.

Is it safe and environmentally friendly?

Injected Teretek® and JOG materials are environmentally inert and have no detrimental effects on the environment.

Get a quote

Arrange a site assessment in three 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 Mainmark’s experts will visit your home or property, assess the damage and determine the likely cause. They will establish the approach needed, create a plan specific to the needs of your building and provide you with a detailed quote.

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