Are your floors sinking?
If you’ve noticed slabs or concrete floors slumping, dipping or becoming uneven, this could indicate sinking foundation issues caused by subsidence or voidage beneath the slab.
When this happens, the load-bearing capacity and functional integrity of the slab are compromised. This applies to everything from residential floors to warehouse slabs that support heavy machinery, bulk storage, or high-traffic areas.
Without timely foundation repairs, sinking floors can lead to serious structural problems, costly downtime, and ongoing safety concerns for homes and businesses.
Resinject delivers foundation repair solutions that raise, re-level and re-support your floor treating the cause, not just the surface symptoms.
What causes sinking floors?
Sinking or uneven floors are typically the result of unstable ground beneath your slab. As voids form and the soil shifts, the foundation begins to lose support, often leading to subsidence.
These ground changes can be triggered by a number of factors, including un-compacted fill, leaking stormwater or sewer pipes, and damaged water mains. Reactive clay soils expand when wet and shrink when dry, while sandy soils are prone to erosion and washout. Both conditions create empty spaces that compromise the stability of the foundation.
Other contributors include poor drainage, substandard site preparation, and extreme weather events. Over time, these issues weaken the soil’s ability to bear weight, making foundation repair essential to restore structural integrity and prevent further movement.
What are the signs of a sinking foundation?
Are you worried about sinking floors caused by subsidence or voidage? There are several warning signs that may indicate your property needs foundation repair or concrete slab re-levelling:
- Cracks in your external and/or internal walls and ceilings
- Cracks in external and/or internal concrete slabs, cement, steps or floors
- Doors that are jamming against the floor or frame when you close them
- Areas in your floor that slump or sound “hollow”
- Variation of your “skirting boards” where the slab is lower than originally intended
- Pumping of slabs, and water egress with heavy vehicle movement across the slab
Subsidence and voidage can represent a serious structural problem to the integrity of your home, business or worksite – and a potential hazard to you and those around you.
This can cause Work Health & Safety issues relating to injuries sustained by forklift operators from traversing uneven slabs, not to mention the maintenance costs of the actual forklift.
If you notice your floors are sinking, call Resinject for slab repair in Sydney, Brisbane and Canberra.
How to repair a sinking foundation
With Resinject slab repair, we stabilise and support sinking floors by injecting our resin under the slabs, void-filling the affected area and increasing the load-bearing capacity of the soils which are supporting the affected slab.
Part of the re-levelling process is re-supporting adjoining areas that could have been compromised due to the subsidence. Additionally, polyurethane piers could also be installed in certain situations – “stitching” the adjoining slabs together is a standard operation when treating industrial slabs.
Contact Resinject & Book Your Free Assessment for foundation repair in Sydney, Brisbane and Canberra.
Recent Foundation Repairs we have completed
A long-term solution for your sinking floor
Resinject slab repairs always provide long-term solutions to fix your sinking floors. This is because we address the root cause of the problem: subsidence and voidage.
We use high-quality chemical resin in house slab foundation repair to stabilise your slabs and foundations. As well as being certified to Australian standard, this resin is so tough, durable and dependable that we provide a 50-year warranty on our slab foundation repair.
If you’re looking for a long-lasting way to restore your property, our house foundation repair services offer a smarter alternative to major excavation or slab replacement.
See what some of our recent clients had to say!
It is now more than two months since Resinject stabilised the foundations of my old house and I couldn’t be happier with the results…
Carolyn S
Completely fixed my sunken garage, would recommend Resinject 100%, totally professional and amazingly skilful. Very reasonably priced too…
Lillian B
The drop in our slab was around 100mm and we didn’t hold much hope of a good result. But Resinject did it and cleaned up…
John S
We are in Brisbane and struggled to find a company that we were confident with. Glad to have come across Resinject. They raise our living room floor by 60mm and we a pleasure to deal with…
Nick T
My experience with these guys has been nothing but first class. From my initial inquiry through to getting the job done, had voidance under my driveway, hey have been great. I highly recommend them…
Craig N
Resinject has done several jobs for my company. The operation is very professional and punctual. Safety of persons and property is the utmost importance and taken very seriously by the team…
Graham C
Here’s why you should choose Resinject to repair your Foundations
Combined 100+ Years Experience
50 Year Product Warranty
Licenced
Builders
Certified Australian Resin
ISO Certified 9001, 14001, 45001
Here’s how our Foundation Repair process works
By injecting our resins, compromised soils will be consolidated and stabilised, allowing for permanent wall repair. Our approach involves:
Prepare
Our experts drill a series of tiny holes in the affected area
Inject
We inject our specially formulated Poly Urethane Resin
Expand
Our Resin fills the voids, hardens instantly which compacts the ground
Result
The area is instantly reinforced and even re-levelled if required
Frequently Asked Questions
Your Structural Consultant 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.
Most residential jobs are finished within a few hours. Bigger projects may take over a day; your Structural Consultant will discuss the time frame as part of the free site assessment and quote.
The cost of sinking foundation repair depends on factors like the extent of ground movement, the size of the affected area and how accessible the site is. At Resinject, we offer free site assessments and transparent pricing based on your specific requirements. Whether it’s a commercial project or a home foundation repair, our resin injection method provides a fast, effective solution that addresses the cause and minimises disruption.
Our crew work from a self-contained mobile unit. We generate our own power and bring all the tools and products required to carry out the works.
With over 100 years of combined experience, Resinject exclusively uses an Australian-engineered resin that can be injected to depths of up to 6.5 meters when needed, ensuring proper re-support is installed. We do offer a 50 year guarantee against shrinkage with our product.
Traditional underpinning can be carried out as an alternate method. However, this generally requires a lot more time on site, bigger equipment, with more disruptions and ultimately more expensive.
On arrival, our crew start by confirming the levels recorded in the initial assessment. We then employ laser equipment to monitor the lifting closely throughout the process, ensuring levelling that is precise to the millimetre.
