Project problem

Outside the Central Coast Council office in Wyong, a block paver footpath had become a safety concern. Like many segmented paving surfaces, it was vulnerable to subsidence and ground movement, leading to uneven sections and the formation of trip hazards.

In this case, the cause was largely due to the tree roots. Starved of water beneath an impervious canopy, the roots had grown upwards in search of moisture, often finding condensation trapped beneath the surface. Over time, this upward pressure displaced the pavers, compromising both safety and accessibility in a busy public zone.

Project solution

Central Coast Council engaged StoneSet to formulate a long-term, low-disruption fix. Our solution replaced the existing surface with a structurally sound, highly permeable system designed to protect tree health while ensuring public safety.

To avoid damaging the existing root system, we specified a shallow 75 mm permeable no-fines concrete base with 25% void content over a Geotextile Fabric—delivering the strength needed for heavy foot traffic without deep excavation. Over this, we installed a 6 mm StoneSet Premium UVR wearing course, offering:

• Extreme permeability – flow rates of 60L per m2 per second, replenishing tree roots and reducing the likelihood of future upward growth
• P5 slip resistance – meeting & exceeding stringent public safety requirements
• Flexibility and crack resistance – accommodating any minor future ground movement

The finished surface acts as a seamless “stone carpet,” completely eliminating trip hazards. The permeable system allows water to pass directly to the root zone, encouraging roots to stay in place and supporting the long-term health of the surrounding trees.

This project highlights that with the right materials, trees & urban dense public spaces can coexist harmoniously.

Project details

• System: 75mm no-fines concrete & 25mm Tan StoneSet Premium UVR
• Area: 15m2
• Installation: 2 working days (including excavation)