Service risers are an essential element in modern multi-storey construction, providing a dedicated vertical route for electrical, mechanical, plumbing and communication services. However, unless they are properly protected, these vertical shafts can become highly effective pathways for the rapid spread of fire and smoke between floors. Because risers typically connect multiple storeys and access different fire compartments, passive fire protection (PFP) is critical to maintaining compartmentation and protecting building occupants.
Risks Associated with Unprotected Service Risers
Without appropriate fire-stopping measures and fire-rated construction, service risers introduce serious life-safety risks, including:
- Rapid Vertical Spread of Fire
Unprotected riser shafts behave like chimneys. Once a fire enters the riser, it can travel quickly upwards and affect multiple floors within minutes. - Loss of Compartmentation
Riser walls and floors form part of the building’s primary fire barrier system. Any breaches or gaps around services compromise the integrity of those barriers and allow fire and smoke to bypass fire-rated construction. - Smoke Transmission into Occupied Spaces
Even when flames are contained, smoke and hot gases can travel through unsealed penetrations and spread into occupied areas, creating serious hazards for occupants and first responders.
PFP Requirements for Service Risers
To effectively contain fire and smoke, service risers must be designed and constructed in accordance with the requirements of the National Construction Code (NCC). In particular:
- Vertical shaft walls and floor slabs enclosing the riser must achieve the Fire Resistance Level (FRL) applicable to the building’s classification.
- All service penetrations passing through these fire-rated barriers must be sealed using tested and certified firestop systems, installed in accordance with AS 4072.1.
- Riser openings and access points must be fitted with fire-rated doors, hatches or covers to ensure ongoing protection and allow safe inspection and maintenance access.
Ceasefire PFP’s Approach
Ceasefire PFP provides end-to-end passive fire protection solutions tailored to the specific needs of multi-storey buildings. Our approach to riser protection includes:
- Installing Fully Tested Firestopping Systems
Every service penetration, whether electrical conduit, cable tray, pipework or duct, is sealed using firestop systems that have been tested to AS 1530.4 and approved for the exact substrate and service configuration. - Providing Fire-Rated Riser Access Doors
We supply and install compliant access doors specifically rated to meet the required FRL of the surrounding barrier, preserving the integrity of the riser while allowing safe access for maintenance. - Comprehensive Compliance Documentation
All works are documented with photographs, product certifications and installation records to support compliance audits and facilitate future maintenance inspections.
Conclusion
Service risers are a vital component of building infrastructure, but they present significant fire risks if left unprotected. Properly designed and installed passive fire protection systems prevent service risers from becoming vertical fire and smoke chimneys, preserving compartmentation and protecting life safety.
Ceasefire PFP is committed to delivering compliant, durable and fully documented riser protection solutions—ensuring that building owners and occupants remain safe throughout the life of the building.
Service risers are an essential element in modern multi-storey construction, providing a dedicated vertical route for electrical, mechanical, plumbing and communication services. However, unless they are properly protected, these vertical shafts can become highly effective pathways for the rapid spread of fire and smoke between floors. Because risers typically connect multiple storeys and access different fire compartments, passive fire protection (PFP) is critical to maintaining compartmentation and protecting building occupants.
