Guide
Passive Fire Penetrations NZ
Passive fire penetrations are one of the most common areas where fire-rated construction is compromised in New Zealand buildings.
This guide explains what penetrations are, why they matter, where defects commonly occur and what good passive fire installation should achieve.
Rated walls and floors
Penetrations occur where services pass through fire-rated walls, slabs, risers and shafts.
Protect compartmentation
Correct treatment helps preserve the intended fire resistance of the building element.
Support remediation
Penetrations are often altered over time and need remedial passive fire work.
Track what was installed
Schedules and photos help identify each penetration for future maintenance and compliance.
What is a passive fire penetration?
A passive fire penetration is an opening created when a service passes through a fire-rated wall, floor or other separating element.
Typical services include plumbing, electrical cables, data, conduits, cable trays and HVAC components.
Once that opening exists, the fire-rated element needs to be reinstated using a suitable passive fire solution for the actual service and substrate condition.
Common penetration types
- Plastic and metal pipes
- Cables and cable bundles
- Conduits
- Cable trays
- Mixed service penetrations
- Retrofit openings in existing buildings
Where penetration defects usually happen
Openings left unsealed
Service installers may leave penetrations incomplete or only partially sealed.
Oversized or irregular openings
Large or poor-quality openings can make system selection and installation more difficult.
Wrong treatment for mixed services
Multiple service types in one opening need careful system selection and detailing.
Changed services after handover
Existing fire stopping is often disturbed during later maintenance or upgrades.
Poor recording of locations
Without a schedule or marked plans, penetrations can be difficult to trace later.
No clear ownership
Responsibility for penetration sealing is often missed between trades on site.
What good penetration treatment should include
Good passive fire treatment for penetrations starts with understanding the real opening condition, not just the product name.
The installer needs to consider the service type, service size, wall or floor construction, fire rating and how the tested detail applies in practice.
Clear documentation is also important so the work can be located, checked and maintained over time.
Useful records for penetrations
- Penetration number or reference
- Location and level details
- Photos before and after
- Service type and size
- Substrate and fire rating
- System or product reference
Frequently asked questions
What is a passive fire penetration?
A passive fire penetration is an opening made in a fire-rated wall or floor for a service such as a pipe, cable, conduit or tray.
Why do penetrations need fire stopping?
Because the opening can compromise the fire rating of the wall or floor unless it is sealed with a suitable fire stopping system.
Are all penetrations the same?
No. Different substrates, services, sizes and fire ratings require different fire stopping solutions.
What records should be kept for penetrations?
Clear photos, location references, system information and penetration schedules are all useful for future compliance and maintenance.
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