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Cracked walls and

If you’re concerned about cracks in your house walls, Resinject can protect your biggest asset with proven chemical ground consolidation that minimises your cracked walls.

What causes cracks in your walls?

There are a number of reasons why a cracked wall occurs. A major cause of cracks in house walls is the ground beneath the foundations. This ground is in a constant state of change. It is important to understand and fix the underlying cause for permanent wall crack repair. Our resin injection method stabilises the ground beneath your foundations increasing the load bearing capacity and prevents further movement of your structure.



Most often the root cause behind wall and ceiling cracks is the soil type beneath a foundation which can cause stress through a foundation and affect the structure above it.

  • Granular or sandy organic soil: there will be some degree of erosion as the sand particles can be washed out through malfunctioning plumbing services.
  • Reactive clay soil: these will swell with increased moisture content and shrink as it dries, forming “voids” or empty spaces that could lead to washouts. Such soils can reach saturation, turning into something of a “bog” with little to no load bearing.
  • Vegetation: sometimes even nearby vegetation can leech moisture from the soils around your property.


Storm water services, sewers, faulty plumbing or even just a dripping tap can affect the stability of your home’s foundation. If the soil beneath your foundation is prone to erosion, voids or bog formation and if your plumbing is not serviceable, this can result in an unstable foundation and cracked walls.


Poor build design and quality can lead to cracked walls. If the building is not adequately constructed with an appropriate drainage system or the ground has not been properly compacted the foundations could be compromised causing instability and cracks in your walls.

A long-term wall crack repair solution

At Resinject our aim is to provide a long-term solution to your wall crack repair needs. While we always want to try and close your cracks, our aim is to repair the source of the problem: the ground beneath your footings and foundations! This minimises the risk of new cracks forming and existing cracks from getting bigger, saving you money in the long run and giving you peace of mind knowing the future of your property is safe.

Types of cracked wall

Most cracked walls will tell a story of one form of subsidence or another – we at Resinject are big believers in “a stitch in time saves nine” and that early detection and repairs in cracked walls can save you in repair bills as well as consolidating the ground which was the original source of compromise.

Stair step cracks

The stair step or zig-zag appearance is often seen on a cracked brick wall. These cracks suggest your home or site foundations are subsiding or the ground has lost pressure which shifts and transfers stress unevenly through the brick wall/structure.

Horizontal cracks

These cracks can indicate that a specific area of ground has moved or voided and has displaced the foundation with it. They are suggestive of a localised area of movement. These cracks appear near the area of movement but can have implications for the whole structure.

Door frame/window cracks:

While these are often hairline cracks which are not usually significant, although they can highlight movement in the footings and foundations to the structure of a home. Again, another case of loss of load bearing capacity from the ground supporting the foundations in the localised area.

Fixing cracks in walls

By injecting our resins, compromised soils will be consolidated and stabilised, which allows for permanent wall crack repair.

Our approach involves:

  • A pre-assessment to determine key injection points for our resin.
  • Injecting our product into the ground at various depths.
  • Increasing both the load bearing capacity of the soils and raising the subsiding part of the building.
  • Stabilising the building as conditions allow.
  • We advise cosmetic repairs are only carried out 4-6 weeks after the injection allowing things to settle – not like other companies.

Frequently asked questions

Will the wall cracks be eliminated?

Our first priority is to minimise future movement of the structure by consolidating and improving the load-bearing capacity of the ground. To confirm that this has been achieved, we need 1-3mm lift. Once this has been done, we then aim to return the structure as close as possible to its original levels as conditions allow. We cannot guarantee closure to cracks in walls, even though cracks may be minimised through our treatment. Cosmetic work should not be attempted straight after our treatment, due to the structure needing to settle.

How long will it take to complete the job?

Most residential jobs are finished within a few hours. Bigger projects may take over a day; your project manager will discuss the time frame as part of the free site assessment and quoting.

When can I carry out cosmetic repairs?

Wall cracks are the consequence of subsidence, after the injection process the building needs time to settle back into its original shape. You should therefore always wait for 4-6 weeks after injection before carrying out any cosmetic repairs.

Do I need to vacate the building whilst work is carried out?

Your Project Manager will discuss this potential need with you during the free site inspection and quoting. Sinking floor piers and other circumstances might necessitate your removing furniture and fittings so that we can work inside. But in most cases, there is no need for you to vacate the property, however it is preferable to have the work area cleared prior to our arrival.

Do you have to park on my property?

Our crew will arrive in a self contained truck, when planning road access, our work truck is approximately 8.0m long, 2.5m wide and 3.2m tall. Due to our long hoses we can work up to 70 metres from our self-contained mobile unit, so there should be no need to park any heavy vehicle in a sensitive area.

What are the guarantees of your product?

Drawing on over 60 years’ combined operational experience, Resinject only uses resin with an Australian Standard that is made in Australia and that can be injected to a depth of up to 3.5 metres if necessary with the required amount of support giving us and the client peace of mind

Our product is guaranteed for 50 years against shrinkage

Drawing on over 60 years’ experience for dependable, lasting results - with Resinject you will get nothing less!

Partnering with you to protect your biggest assets