Boral specialty rocks are designed for applications where standard aggregates are not suitable. Our range includes armour rock, spalls, shot rock and gabion rock, produced from hard rock quarries to support erosion control, stabilisation and civil construction projects.
Contact us to request a quote
Armour rock
Large individual rocks selected for mass, durability and stability in high-impact environments such as coastal and river structures.
Best for
- Coastal protection and shoreline stabilisation
- Wharf and breakwater construction
- High-energy erosion control
Applications
- Bank and shoreline stabilisation
- Wharf and breakwater structures
- Erosion control in coastal and river environments
Features & benefits
- Large, heavy rock typically ranging from 500 mm³ to 1.5 m³
- High mass provides resistance to wave and water forces
- Durable hard rock selected for long-term performance
- Irregular shape supports interlocking and stability
Supply format
- Bulk
Spalls
Larger processed rock supplied in consistent sizes, typically used for stabilisation, drainage and civil works.
Best for
- Bank stabilisation and drainage
- Civil construction and land reclamation
- Access tracks for heavy equipment
Applications
- Bank stabilisation and erosion control
- Drainage and open spoon drain lining
- Access tracks and working platforms
Features & benefits
- Typically sized between 150 mm and 200 mm
- Controlled sizing ensures consistency of material
- Angular rock promotes interlocking and stability
- Durable hard rock suited to exposed environments
Supply format
- Bulk
Shot rock
Rock produced directly from quarry blasting, supplied in a range of sizes depending on source and blast conditions.
Best for
- Bulk erosion control
- Fill material in large-scale civil works
- Situations where consistent sizing is not required
Applications
- Bank stabilisation and erosion protection
- Wharf and breakwater construction
- General bulk fill and civil works
Features & benefits
- Variable sizing based on blast design and quarry source
- Large rock suitable for barrier and stabilisation applications
- Cost-effective solution for bulk supply
- Durable hard rock material
Supply format
- Bulk
Gabion rock
A larger nominated size aggregate designed for use in gabion baskets and structural retaining systems.
Best for
- Retaining walls and structural systems
- Bank stabilisation and channel linings
- Landscaping and land reclamation
Applications
- Gabion baskets and retaining walls
- Bank stabilisation and erosion control
- Land reclamation and landscaping
Features & benefits
- Sized to suit gabion baskets and mattress systems
- Durable rock selected for structural performance
- Angular shape ensures stability within baskets
- Allows drainage through permeable structures
Supply format
- Bulk
Typical applications
Boral specialty rocks are used across a range of infrastructure and environmental applications, including:
- Coastal and river erosion control
- Bank stabilisation and land reclamation
- Retaining walls and gabion systems
- Drainage and channel lining
- Access tracks and heavy equipment platforms
These materials are selected based on size, weight and placement method, ensuring stability and long-term performance in demanding environments.
Choosing the right specialty rock
| Product | Best suited for |
|---|---|
| Armour rock | Coastal protection and high-energy erosion control |
| Spalls | Drainage, stabilisation and civil construction |
| Shot rock | Bulk supply and large-scale erosion control |
| Gabion rock | Retaining walls, baskets and structural systems |
Technical specifications
Boral specialty rocks are produced from durable hard rock and supplied in a range of sizes and gradings to suit specific project requirements. Product selection is typically based on mass, durability, angularity and intended application.