Form · 80–300 mm
System — indicative fig. C·42
Fire A1 Non-combustibleEmbodied carbon 25kgCO₂e/kg HighCompressive 150MPa StructuralDesign life 50yr
Layered green roof assemblies with drainage and growing media; extensive systems typically 90-150 mm deep with saturated weights around 95-155 kg/m2.
01 Physical
Density 800kg/m³
Specific gravity 1.2
Porosity 40%
Water absorption 60%
UV resistance Excellent
Chemical resistance Good
pH tolerance 5.5-8.5
02 Mechanical
Tensile strength 7MPa
Compressive strength 150MPa
Impact resistance Moderate
Creep resistance Good
03 Thermal
Thermal conductivity 0.3W/m·K
Specific heat 1000J/kg·K
Thermal expansion 30×10⁻⁶/°C
04 Compliance & Fire First question
Combustibility class Non-combustible
05 Sustainability & Health
Embodied carbon 25
Carbon footprint -15
Embodied energy 180MJ/kg
Water footprint 500L/kg
Recyclability 60%
Recycled content 50%
Renewable content 20%
Circular score 7
VOC emissions 0
Toxicity rating Non-toxic
LEED contribution 6
06 Durability · Cost · Logistics
Expected lifespan 50
Maintenance interval Bi-annual
Warranty period 10
Material cost (range) 155-835
Material cost (per unit) 400
Lead time 1-3 weeks
Lifecycle cost 600
Annual maintenance 35
Market availability Good
07 Assessment
Advantages
- Temperature reduction: 4-6°C in buildings, 3.6-11.3°C local cooling
- Energy savings: 9-50% reduction in consumption
- Stormwater retention: 60-70% water capacity
- Acoustic benefits: 3-8dB sound reduction
- Extended waterproofing life through UV protection
- 50-year design life with proper maintenance
- Carbon sequestration: Up to 15 kg CO2/m² over life
- Biodiversity habitat creation in urban areas
- Green Star credits contribution potential
- Urban heat island mitigation
Constraints
- High upfront costs: $155-835/m² depending on type
- Structural load requirements: 60-500kg/m² saturated
- Drought stress requiring irrigation in dry summers
- Limited suitable native species palette
- Annual maintenance costs: $2,000-5,000
- Structural reinforcement may add $5,000-20,000
- No specific NCC provisions (Performance Solution required)
- Professional design team required
- Waterproofing failure risk if poorly installed
- Access requirements for maintenance
08 Applications
A1 Commercial office buildings (CBD focus)
A2 Apartment buildings for amenity spaces
A3 Shopping centres and industrial buildings
A4 Institutional buildings (schools, hospitals)
A5 Water authority buildings for WSUD compliance
A6 Corporate headquarters with sustainability targets
A7 Retrofits on existing buildings with adequate structure
A8 Carpark rooftops in urban developments
09 Sources & Standards
Sources pending — citations for this material are not yet recorded. Verify all figures against manufacturer data and current standards before specifying.