Installing a mezzanine floor is one of the most effective ways to unlock additional space within your building, but it also comes with important fire safety obligations.
In New Zealand, mezzanines must comply with the NZ Building Code, and fire protection is a key part of that. Getting it right from the outset not only ensures compliance, but also protects your people, your assets, and your business continuity.
Why Fire Safety Matters for Mezzanines
A mezzanine changes the way a building performs in a fire. It introduces a second level, often creates another fire cell, can restrict sprinkler coverage, and may affect how smoke and heat move through the space.
Without proper planning, this can:
- Increase fire risk
- Compromise safe evacuation
- Lead to compliance issues during consent or inspection
- Impact insurance cover
That’s why fire safety needs to be considered as part of the initial design, not added later.
Key Fire Safety Considerations
Fire requirements will vary depending on the size, height, and intended use of the mezzanine, but the following areas are typically assessed in New Zealand projects:
Fire Resistance Ratings (FRR):
Structural steel in a mezzanine may require fire protection to achieve a specified Fire Resistance Rating (FRR), often 30 or 60 minutes, depending on the building’s use and occupancy.
This can involve:
- Intumescent coatings
- Fire-rated board systems, such as. GIB Fyreline®
- Encasement solutions
Not all mezzanines require FRR (particularly smaller storage platforms), but it must be confirmed during the design phase.
Means of Escape:
Safe evacuation is a critical requirement under the NZ Building Code.
Depending on the mezzanine layout and occupancy, this may include:
- One or more staircases
- Minimum stair widths
- Maximum travel distances to exits
- Clear, unobstructed escape routes
Larger or higher-occupancy mezzanines will typically require multiple exit points.
Smoke Detection and Alarms:
Smoke detection systems need to account for both levels of the space.
This may involve:
- Extending existing alarm systems
- Adding detectors above and below the mezzanine
- Ensuring system integration across the building
Early detection is critical, particularly in storage-heavy environments.
Fire Separation (Where required)
If the mezzanine includes offices, staff areas, or higher-risk activities, fire-rated separation may be required.
This could include:
- Fire-rated walls
- Protected stair enclosures
- Separation from high-risk storage zones
Requirements will depend on the building’s use and risk profile.
Sprinkler Systems:
If the building is sprinklered, the mezzanine must not compromise its effectiveness.
In some cases, this can mean:
- Installing sprinkler coverage above the mezzanine
- Adding sprinklers below the mezzanine floor
- Ensuring adequate clearance between stored goods and sprinkler heads
Failure to address this is one of the most common compliance issues we see.
Common Pitfalls to Avoid
In our experience, most fire compliance issues come down to a few avoidable mistakes:
- Assuming existing fire systems are sufficient
- Not considering sprinkler coverage early enough
- Underestimating escape requirements
- Failing to involve the right professionals during design
These oversights can result in costly redesigns or delays during council approval.
How Altivo Approaches Fire Compliance
At Altivo, we work with engineers and fire consultants early in the process to ensure all fire safety requirements are addressed upfront.
This includes:
- Assessing your building’s current fire systems
- Identifying any upgrades required
- Designing mezzanines that integrate with compliance requirements
- Supporting documentation for building consent
Our goal is simple, deliver a mezzanine that not only works for your space but also meets all regulatory requirements without surprises.
Fire safety is a critical part of any mezzanine project in New Zealand. While requirements can vary, the key is getting the right advice early and designing with compliance in mind from day one. If you’re considering a mezzanine and want clarity around fire requirements, it’s worth having that conversation upfront, it can save significant time and cost down the track!