A Smarter Approach to Fire-Rated Ceilings & Bulkheads

KOROK® Ceiling & Bulkhead Systems provide a smarter, more efficient approach to fire-rated ceiling construction for commercial, industrial, and infrastructure projects. Utilising KOROK® 78mm panels, these systems are designed to simplify fire continuity while enabling fast underside installation with Fire Resistance Ratings of up to -/120/120.

Developed to address the practical challenges faced on modern construction sites, KOROK® systems are ideal for service-heavy environments, restricted-access ceiling spaces, and complex construction sequencing. The lightweight panel design helps reduce installation complexity, minimise disruption to other trades, and improve overall site efficiency.

Traditional Fire-Rated Ceiling Construction Can Be Complex

Conventional fire-rated ceiling and bulkhead systems can create unnecessary challenges around ceiling plenums, service coordination, access limitations, and installation sequencing. In many cases, traditional systems require additional linings to be installed from above, increasing labour, programme time, and coordination requirements. KOROK® Ceiling & Bulkhead Systems simplify this process.

Designed specifically for installation from the underside, KOROK® systems reduce reliance on roof-space access while supporting efficient programme sequencing for new builds, retrofit projects, and staged construction works.

The symmetrical profile of the KOROK® 78mm panel allows seamless integration with KOROK® fire-rated wall systems, concrete/masonry, and structural steel elements. By utilising compatible KOROK® wall and ceiling systems together, fire continuity can be maintained without overcomplicating details or requiring excessive additional ceiling linings.

All KOROK® panel tasting has been carried out at nationally accredited laboratories to AS1530: Part 4, providing designers, engineers, and contractors with confidence in system performance and compliance. Keep it simple with lightweight, code-compliant KOROK® systems designed to work together to meet demanding fire and acoustic performance requirements.

Compliant Wall‑to‑Floor Solutions for Modern Construction

Created to support today’s complex building designs, KOROK® has developed a series of Floor Junction Details that strengthen, clarify, and enhance how KOROK® walls interface with modern floor construction, where fire performance matters most.

As building designs and structural systems evolve, KOROK® developed Floor Junction Details to strengthen existing requirements, increase technical clarity, and deliver more comprehensive CAD documentation – supporting accurate specification, smoother construction outcomes, and greater confidence from concept through consent and construction.

Why This Matters

In modern construction, fire performance is only as strong as the weakest interface. Unresolved wall-to-floor junctions can compromise fire separation, increase risk, and create uncertainty at design review or consent stage. KOROK® addresses this directly, ensuring continuity of fire cells where walls meet:

• Profiled metal tray concrete floors 
• Timber formwork and Stahlton rib systems
• CLT and other structural floor types
• Precast concrete floor (Double Tee)

These assessed solutions remove ambiguity and support compliant detailing across a wide range of building typologies.

Proven Fire Performance

KOROK® Floor Junction Details are supported by a formal engineering assessment, delivering verified fire performance aligned with regulatory expectations.

• Up to -/120/120 FRR with KOROK® Panel 78mm
• Up to -/60/60 FRR with KOROK® Panel 51mm
• Valid for wall heights up to 6.0 metres
• Based on testing to AS 1530.4 fire resistance standards

Engineered Flexibility for Real‑World Projects

Designed with practical construction and coordination in mind, KOROK® Floor Junction Details provide flexibility without sacrificing compliance. These engineered solutions accommodate:

• Walls running parallel or perpendicular to floor profiles
• Integration with deflection and non‑deflection head details
• Compatibility with multiple structural systems without redesign

This allows engineers and architects the freedom to resolve complex interfaces while maintaining fire performance continuity.

More Technical Resources

3. Durability and Longevity

The primary materials used in KOROK® panels—steel and concrete—are both known for their durability and long service life.

Concrete structures can last for many decades and often well over a century. Steel maintains its structural properties over time and can be recycled at the end of a building’s life. Because KOROK® panels are made from these long‑lasting materials, they contribute to buildings that require fewer replacements and less material use over time.

4. Deconstruction and Reuse

KOROK® panels can also be deconstructed and reconstructed rather than simply demolished. This allows materials to be reused in future building projects.

Designing buildings with components that can be reused helps reduce construction waste and extends the lifecycle of building materials.

5. Performance as a Sustainability Factor

Sustainability is not only about reducing carbon emissions—it is also about ensuring products perform reliably throughout the life of a building.

KOROK® panels are widely used because they provide exceptional fire and acoustic performance. Products that protect buildings from fire and control noise for decades without needing replacement contribute strongly to long‑term sustainable construction.

Want to know more about how these changes impact your project?

Fire & Acoustic Separation for Apartments & Multi Unit Projects

Multi‑unit residential projects deserve solutions that deliver absolute clarity, certainty, and performance. That’s exactly what the KOROK® Intertenancy Wall System provides. Proudly NZ‑made and BRANZ appraised, it’s engineered to strip away complexity, accelerate construction programmes, and give your team confidence from the very first design decision through to final completion. With clean, predictable onsite installation and consistently reliable fire and acoustic performance, the system transforms intertenancy from a pain point into a proven advantage.

Watch KOROK® Intertenancy System in Action

Planning a Multi‑Unit Project?

KOROK® Intertenancy Wall System Projects

Some of our KOROK team members, including our Systems & Sustainability lead, recently visited NZ Steel’s Glenbrook site for a look behind the scenes at their game-changing Electric Arc Furnace (EAF) project.

This innovative project will replace two coal-fuelled rotary kilns at the Glenbrook steel mill, reducing NZ Steel’s carbon emissions by over 45%. The EAF will use renewable electricity and recycled scrap steel instead of coal, cutting NZ Steel’s carbon emissions by around 1 million tonnes a year  – that’s about 1% of New Zealand’s total emissions!

The project, supported by the New Zealand Government through the GIDI Fund, is expected to be operational by mid-to-late 2026, marking a significant milestone in New Zealand’s decarbonisation journey.

It was great to see this innovation up close and discuss how these advancements align with our own sustainability goals at KOROK.

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A focused manual outlining approved penetration seals using Promat products with KOROK® walls, supported by BRANZ Test Report FR10185-001-02.
What you’ll find inside:

• BRANZ-approved solutions for service penetrations

• Promat’s expertise in structural protection, compartmentation, fire stopping, and ductwork systems

• Robust, tested solutions for challenging project requirements

Download the PROMASEAL® Service Penetrations Manual with Promat

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This technical guide provides a comprehensive overview of Hilti’s passive fire protection systems tested and assessed for use with KOROK® intertenancy and fire-rated wall systems. Developed to support designers, engineers and contractors, this document consolidates key firestop solutions that tested in accordance with AS 1530.4 and assessed in accordance with AS 4072.1 and are compliant under the NZBC Clause C for service penetrations in KOROK® walls.

Hilti’s firestop products are engineered for performance, tested for compliance, and supported by international approvals and local assessments. Each system outlined in this guide has been selected based on its compatibility with KOROK® wall (51mm and 78mm) configurations and its ability to maintain fire resistance ratings across a wide range of service types, including:

• Power and data cables
• PVC, PEX, and metal pipes
• Cable bundles and conduits
• HVAC services
• Structural steel and linear gaps

This guide includes:

• A system index for quick navigation
• Detailed tables of tested configurations
• Installation notes and performance ratings
• Reference to relevant test reports and approvals

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