6 Metre Canopy Trees – Deep Soil & Rooting Volume Guidance | Whitehorse

Direct Compliance Guidance (6m Canopy Class)

Performance-based soil guidance typically includes:

• 3–4 metres contiguous soil width
• 600–800mm natural soil depth
• 12–20 cubic metres unencumbered rooting volume

These represent performance expectations rather than fixed statutory minimums.

Contiguous Soil Width

• Minimum 3 metres clear soil width
• Preferably 3–4 metres where achievable
• Narrow boundary strips often compromise canopy development
• Soil must be continuous, not fragmented around services

Soil Depth

• Minimum 600mm natural soil depth
• 800mm preferred for long-term structural stability
• Shallow fill or compacted soil reduces viability
• Soil above suspended slabs or basements is often inadequate

Soil Volume (Performance-Based Guidance)

• Approximately 12–20m³ contiguous, unencumbered soil
• Volumes below 12m³ frequently restrict canopy performance
• Volumes above 15m³ significantly improve structural stability
• Rooting zones must be free from basement slabs and service corridors

Common Rejection Scenarios

• Soil located over basements
• Fragmented rooting area
• Insufficient soil depth
• Unrealistic canopy modelling
• Inadequate solar access