171 Clarence Street, NSW

Sector

Office & Commerical

Location

Sydney, NSW

The project at 171 Clarence Street, Sydney, involved the installation of new supply air louvres within the building’s façade to support mechanical upgrades to improve air intake and ventilation.

The modifications required a Performance Solution to address non-compliance with the Deemed-to-Satisfy (DtS) Provisions of the Building Code of Australia (BCA) regarding fire protection of openings within 3 metres of the property boundary. Situated in a dense commercial district, the project necessitated careful consideration of fire spread risk and building integration.

Key challenges:

Safety and Compliance: The new louvres are located within 3 metres of the property boundary and do not meet the standard DtS requirements for protection against fire spread.
Architectural Constraints: The installation must maintain functionality while ensuring minimal disruption to the existing building façade and mechanical systems.
Sustainability Considerations: The design integrates non-combustible aluminium louvres to enhance fire safety while minimising environmental impact.
Cost Efficiency: Balancing compliance solutions with cost-effective fire protection measures to avoid excessive modifications to existing structures.
Technical Complexity: Integrating the louvres with fire-rated plenums and a motorised fire damper system to ensure adequate fire resistance without impeding mechanical airflow.

Key solutions:

Fire Protection Measures: The new plenum is constructed with a fire-resistance level (FRL) of -/60/60, incorporating a motorised fire damper to limit fire spread.
Material Selection: The louvres are constructed from non-combustible aluminium to mitigate fire risks while maintaining airflow efficiency.
Performance-Based Design: The fire risk assessment demonstrated that radiation heat flux levels are below ignition thresholds, justifying the alternative solution.
Building Management Strategy: A fire safety management plan will be implemented to ensure ongoing compliance, including regular inspections and maintenance.

Key outcomes:

Regulatory Compliance: Achieved compliance with BCA Performance Requirement CP2 through a performance-based fire engineering approach.
Enhanced Safety Measures: The integration of fire-rated plenums, dampers, and sprinklers ensures improved fire protection while maintaining operational effectiveness.
Preserved Building Functionality: The solution allows for necessary mechanical upgrades without compromising architectural integrity.
Sustainable and Cost-Effective Design: Use of non-combustible materials and targeted fire protection measures balance safety with cost efficiency.
Minimised Impact on Occupants: The strategy ensures minimal disruption during implementation while maintaining safe evacuation routes.

The successful integration of fire engineering solutions at 171 Clarence Street highlights a strategic approach to balancing safety, compliance, and functionality. By employing a performance-based design, the project achieves BCA compliance while preserving the integrity of the building’s mechanical and architectural systems. This project sets a standard for future refurbishments in dense urban environments, demonstrating how innovative fire engineering can enable safe and efficient building upgrades.

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