At this year’s TREENET – AS4970 Conference, Arbor Centre’s Alex Bodenstaff delivered a compelling presentation on the realities and responsibilities of Working within Tree Protection Zones (TPZs). Held on 19 June 2025, the session provided practical insights into how projects can proceed while still upholding the principles of AS4970 and safeguarding tree health.
Alex challenged the notion of TPZs as ‘No Go Zones,’ encouraging industry professionals to see them instead as workable zones – provided the right planning, techniques, and accountability measures are in place.
Key Takeaways from the Presentation:
1. Work-Specific Tree Protection Planning
Tree Protection Plans must be tailored to each project. Rather than relying solely on the notional TPZ derived from AS4970 formulas, the Arbor Centre’s approach involves site-specific assessments, including canopy and root investigations, to define realistic and protective zones such as:
- ‘Work Specific’ Tree Protection Zones (TPZs)
- Canopy Protection Zones (CPZs)
- Ground Protection Zones (GPZs)
2. Innovative Methods in Action
The presentation highlighted a range of field-tested strategies to minimise impact while enabling essential works:
- Canopy Tie Back as an alternative to pruning
- Rootzone Coring and Root Canals to stimulate new root growth
- Trench Minimisation using vacuum excavation and grout injection
- Aeration Layers beneath temporary and long-term access ways
3. Surface and Site Management Within TPZs
From installing raised walkways and bog mats to managing above-ground storage solutions, the Arbor Centre team continues to develop solutions that enable progress without compromising tree vitality.
4. Reinforcing Best Practice
Each method was underpinned by a respect for tree biology and construction practicality, ensuring that urban development and tree retention are not mutually exclusive.
This session reinforced the Arbor Centre Group’s ongoing commitment to practical, science-informed urban arboriculture. By aligning development needs with environmental stewardship, we continue to help shape greener, more sustainable spaces across Australia.
To learn more about how we apply these principles on real-world projects, visit www.arborcentre.com.au.