Precast concrete stairs, Class 2 finish (Specified by tread/riser dimensions)
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.
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.
Precast concrete stairs with Class 2 finish are factory-manufactured structural elements designed for indoor applications in Australian buildings. Class 2 represents high-quality architectural off-form concrete finish suitable for external and internal facades viewed in detail. These units offer exceptional durability, fire resistance (non-combustible), acoustic performance (STC 54-55 dB), and structural integrity. Manufactured to AS 3610.1:2018 standards with controlled quality processes ensuring consistent surface finish with minimal blowholes and colour variation acceptable for architectural applications.
- 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
- 01 Speed of installation (80-200 m²/day with crane)
- 02 Factory quality control ensuring consistent finish
- 03 Exceptional durability (50-100 year design life)
- 04 Inherent fire resistance (non-combustible)
- 05 Superior sound control (STC 54-55 dB)
- 01 Heavy weight requiring cranes (240-260 kg/m²)
- 02 Specialised transportation needed
- 03 Design limitations for complex curves
- 04 Higher initial cost than cast-in-place
- 05 Installation expertise required (certified riggers)
- Density
- 2400 kg/m³
- Specific gravity
- 2.4
- Porosity
- 10 %
- Water absorption
- 3 %
- Hardness
- 7
- UV resistance
- Excellent // No degradation from UV exposure
- Chemical resistance
- Good // Resistant to mild acids/alkalis
- pH tolerance
- 8.5-13.5
- Surface roughness
- 2 µm
- Tensile strength
- 4 MPa
- Compressive strength
- 40 MPa
- Flexural strength
- 6.5 MPa
- Shear strength
- 12 MPa
- Poisson's ratio
- 0.2
- Impact resistance
- High // Qualitative rating
- Creep resistance
- Moderate // Long-term deformation
- Embodied carbon
- 350 kgCO2e/m³ Per m³ of precast concrete; per-kg ≈ 0.146 kgCO2e/kg at density 2400 kg/m³.
- Carbon footprint
- 156
- Embodied energy
- 700 MJ/kg
- Water footprint
- 180 L/kg
- Recycled content
- 20 %
- Renewable content
- 0 %
- Circular score
- 75
- Combustibility class
- Non-combustible // AS 1530.1
- Fire resistance level
- 120
- Ignition temp
- 750 °C
- Flame spread index
- 0
- Smoke dev. index
- 3
- Heat release rate
- 0
- Material cost (range)
- 250-400 // AUD/m² (Class 2 finish, supply only)
- Material cost (per unit)
- 325
- Lead time
- 21
- Lifecycle cost
- 15
- Annual maintenance
- 5
- Market availability
- Excellent // Multiple Victorian suppliers
- Expected lifespan
- 75
- Maintenance interval
- 12
- Warranty period
- 12