The Project.

In the picturesque but challenging terrain surrounding a Primary School, Kenward embarked on a pivotal project to lay the Modular Building Foundations and Infrastructure for future learning spaces. Tasked with preparing the site for the installation of cutting-edge modular buildings. Kenward’s mission was to execute comprehensive groundworks including site clearance, foundational work, and addressing unique soil conditions. The project’s success was critical in expanding the school’s capacity to accommodate its growing student body, employing innovative techniques to ensure stability, safety, and sustainability in its construction efforts.

Challenge 1:
Unstable Ground Conditions

Initial ground analysis revealed two significant challenges

  • Uncontrolled Made Ground: The presence of uncontrolled made ground, typically consisting of fill material of unknown origin and variable composition, can lead to uneven settlement and structural instability.

  • Loose Sands: Loose sands have low bearing capacity, meaning they cannot support significant weight without significant deformation.

Building directly on this ground would have resulted in unacceptable settlement and potential damage to the structures.

Vibro Stone Columns

We addressed this challenge through Vibro Stone Column (VSC) technology provided by Vibro Menard. This ground improvement technique involves:

  • Inserting a vibroprobe into the ground.
  • Compacting the surrounding soil through vibrations.
  • Introducing granular material (stone) into the loosened zone.

By incorporating these columns beneath the foundations and ground-bearing slabs, a composite material was created that increased the soil’s load bearing capacity and mitigated the risk of long-term settlements, ensuring the project’s foundational stability.

Challenge 2:
Radon Gas Mitigation

A second challenge emerged from the geographical analysis of the site: a high risk of Radon gas exposure. Radon, a naturally occurring radioactive gas, poses significant health risks in concentrated levels, particularly in enclosed spaces such as school buildings. Exposure to high levels of radon is the leading cause of lung cancer among non-smokers according to UK Health Security Agency. The imperative to protect future students and staff from this invisible threat added a layer of complexity to the project, demanding an efficient and reliable barrier against radon infiltration.

Our strategy to address the radon risk was the implementation of a Radon Gas Protection Membrane, a protective membrane designed to shield the building’s interior from radon gas entry. Made from durable polyethylene, this barrier was incorporated at the foundational construction stage, acting as a critical safeguard against harmful gas levels. Its easy-to-install nature did not compromise the project timeline, blending seamlessly with the overall groundworks plan to ensure a safe, radon-protected environment for the school’s future occupants.


Kenward’s expertise in groundwork ensured the successful expansion of the primary chool. By employing innovative solutions like Vibro Stone Columns and Radon Gas Membranes, Kenward provided a stable and safe foundation for the new modular teaching spaces, allowing the school to expand its capacity and continue delivering a quality education.