Form · Sizes pending
Cementitious — indicative fig. M·33
Fire A1 Non-combustibleEmbodied carbon 0.15kgCO₂e/kg LowCompressive 40MPa StructuralDesign life 75yr Durable
Factory-manufactured concrete stair units with Class 2 off-form finish, providing rapid installation, inherent fire resistance, and superior structural performance for commercial and multi-residential buildings.
01 Physical
Density 2400kg/m³
Specific gravity 2.4
Porosity 10%
Water absorption 3%
Hardness 7
UV resistance Excellent
Chemical resistance Good
pH tolerance 8.5-13.5
Surface roughness 2µm
02 Mechanical
Tensile strength 4MPa
Compressive strength 40MPa
Flexural strength 6.5MPa
Shear strength 12MPa
Poisson's ratio 0.2
Impact resistance High
Creep resistance Moderate
03 Thermal
Thermal conductivity 1.44W/m·K
Specific heat 880J/kg·K
Thermal expansion 12×10⁻⁶/°C
04 Compliance & Fire First question
Combustibility class Non-combustible
Fire resistance level 120
Ignition temp 750°C
Flame spread index 0
Smoke dev. index 3
Heat release rate 0
05 Sustainability & Health
Embodied carbon 350kgCO2e/m³
Carbon footprint 156
Embodied energy 700MJ/kg
Water footprint 180L/kg
Recyclability 100%
Recycled content 20%
Renewable content 0%
Circular score 75
VOC emissions 0
Toxicity rating Non-toxic
LEED contribution 3
06 Durability · Cost · Logistics
Expected lifespan 75
Maintenance interval 12
Warranty period 12
Material cost (range) 250-400
Material cost (per unit) 325
Lead time 21
Lifecycle cost 15
Annual maintenance 5
Market availability Excellent
07 Assessment
Advantages
- Speed of installation (80-200 m²/day with crane)
- Factory quality control ensuring consistent finish
- Exceptional durability (50-100 year design life)
- Inherent fire resistance (non-combustible)
- Superior sound control (STC 54-55 dB)
- Low maintenance requirements
- Cost effectiveness over lifecycle
- High structural integrity
- Customisation options for dimensions and finishes
- Immediate safe access after installation
- Weather-independent manufacturing
- Reduced site labour requirements
Constraints
- Heavy weight requiring cranes (240-260 kg/m²)
- Specialised transportation needed
- Design limitations for complex curves
- Higher initial cost than cast-in-place
- Installation expertise required (certified riggers)
- Manufacturing lead time (3-4 weeks typical)
- Limited modification after casting
- Transport constraints (12m maximum length)
- Site access requirements for crane
- Joint detailing critical for performance
08 Applications
A1 Commercial buildings and office complexes
A2 Multi-residential apartments and townhouses
A3 Educational facilities and universities
A4 Healthcare buildings and hospitals
A5 Hospitality venues and hotels
A6 Industrial facilities and warehouses
A7 Parking structures and garages
A8 Public buildings and civic centres
A9 Fire escape stairs (FRL 60-240 minutes)
A10 Main access stairways
A11 Complete stair flights (1-7 risers typical)
A12 Stair landings and intermediate platforms
09 Sources & Standards
Sources pending — citations for this material are not yet recorded. Verify all figures against manufacturer data and current standards before specifying.