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Void Filling

URETEK void filling solutions can be used to fill any size of void. Our systems are ideal for filling pipelines, basements, tunnels, caves, mine shafts and conduits. 
URETEK specialise in the application of a range of materials to fill voids, depending on the size and location. Our solutions have proved to be a super-fast alternative to conventional void filling. All of our materials are recyclable, so if at a later date the void needs to be accessed, the geopolymer can be removed. 

Where required, we also provide a specialist load bearing void fill solution that can be applied directly and through a small hole, offering a non-disruptive solution for the customer needs. The URETEK void filling process involves filling a cavity, either with a specific URETEK geopolymer or with a combination of deactivated clay balls and URETEK geopolymer. The filling is achieved by using lightweight materials that do not overload the underlying soil. In case of a damaged structure above the void, the ground between the void and the structure can be treated by applying URETEK ground improvement solutions. 


Preliminary survey
Determining the volume and geometry of the cavity. Through an engineering design process, defining the repair methods. 

Preparation for installation
Layout for designing the installation holes for a geopolymer injection.

Geopolymer Injection 
Injection of a URETEK geopolymer designed for void filling. If the clay balls are used, the injection of geopolymer takes place amongst the expanded clay balls, or just the top part (intrados) to achieve a bonding and compression. 


  • A unique, expanded structural geopolymer that becomes super-light in weight with good bearing resistance.
  • Produced on site from a liquid base and can be poured, pumped or injected into voids, holes or interstitial spaces - or laterally over long distances.
  • Expanded before placement and with a short gel time, it displaces residual liquids and can be applied underwater. 
  • The URETEK geopolymer can be applied in connection with the clay balls, creating a perfect bonding.

Interested in our services or want to get a price estimation?

If you want more information about URETEK and our services, or if you are wondering if our solutions could be the right solution for your object, fill out the contact form and one of our experts will be in contact with you.