KOROK® has 2-way fire-rated wall systems for fire separation of Scissor Stairs or any Stairs.

KOROK® Scissor Stair Systems are proprietary, non-loadbearing, two-way fire-rated wall systems designed to provide fire and acoustic separation between independent stair flights within scissor stair configurations or other stair arrangements.

The system utilises 78mm thick interlocking KOROK® panels installed between two independent stair stringers to form a continuous fire-resisting barrier. Panels may be oriented vertically, horizontally, or in combination to suit stair geometry and construction sequencing requirements.

The system is BRANZ tested and Warringtonfire assessed, and is intended to meet or exceed the performance requirements of the New Zealand Building Code (NZBC) and NCC Australia within the defined scope.

How the System Works

KOROK® Scissor Stair Systems are constructed using 78mm thick panels comprising roll-formed galvanised or colour steel outer shells with an aerated concrete core and interlocking tongue-and-groove profiles, forming a continuous, tightly sealed wall plane that reduces the risk of acoustic leakage between stair flights. The system is non-combustible and provides two-way fire resistance when exposed from either side. In fire conditions:

• Horizontal fire resistance is achieved through a quadrilateral fire-resistant section formed between the two independent stairs
• Vertical fire resistance is achieved through the wall-to-stair stringer boundary condition

KOROK® Scissor Stair Systems provide independently tested Fire Resistance Ratings up to –/120/120 and –/60/60 depending on configuration, while the 78mm interlocking panels deliver acoustic performance up to STC 76, meeting or exceeding NZBC Clause G6 requirements through their aerated concrete core and tightly sealed joint geometry.

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Fire and Acoustic Rated Wall Systems for Shafts, Risers, and Ducts

KOROK® fire and acoustic rated wall systems offer superior solutions for lift shafts, risers, and ducts. Lift shafts require fire and acoustic rated protection to ensure building safety. With our innovative panel design, you can install from one side only, eliminating the need for internal scaffolding and significantly reducing construction time and costs.

Key Advantages:

• Single-side installation: No scaffolding required inside the shaft, speeding up the construction process.
• Fire and acoustic performance: Our systems provide high-level fire resistance and acoustic insulation, ensuring safety and comfort. For lift shafts, this fire and acoustic rated protection is critical.

KOROK Lift Shaft, Risers, Ducts Systems

Engineered for Ultimate Sound Isolation and Code-Compliant Fire Safety

KOROK® is the leading provider of fire and acoustic rated protection for cinemas across New Zealand. Our systems are specifically designed to deliver superior soundproofing and fire resistance, making them the ideal choice for cinema construction and renovation projects. Indeed, when considering fire and acoustic rated solutions, our KOROK® systems stand out for cinemas.

Why Choose KOROK® for Cinemas?

• Superior Soundproofing: Our fire-rated wall systems ensure minimal sound transmission between auditoriums, enhancing the cinema experience along with fire and acoustic protection for cinemas.
• High Fire Resistance: KOROK® systems provide reliable fire protection, meeting New Zealand’s building code requirements for safety, a crucial aspect for cinemas.
• Proven Performance: With years of successful installations, KOROK® has become the trusted name in cinema construction, providing unmatched fire and acoustic solutions that cinemas can rely on for both safety and sound quality.

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KOROK Cinema Systems

Engineered Fire and Acoustic Systems for Industrial and Commercial Spaces

KOROK® Warehouse and Retail Systems are high-performance, non-loadbearing internal wall systems designed to provide secure fire separation and acoustic control in industrial, warehouse, bulk retail, and intertenancy environments.

The system consists of interlocking steel-faced panels with an aerated concrete core, engineered for certified fire resistance, acoustic attenuation, structural reliability, and long-term durability. Panels can be installed vertically or horizontally and are suitable for both single-wall and twin-wall configurations. The systems have been developed in accordance with recognised Australian and New Zealand Standards and are substantiated through BRANZ testing and appraisal (Appraisal No. 559), ensuring verified and compliant performance.

How the System Works

KOROK® panels are roll-formed from zinc-coated steel strips and encapsulate a lightweight aerated concrete core. The interlocking tongue-and-groove profile forms a continuous sealed barrier that enhances both fire integrity and acoustic isolation.

System performance is achieved through the combined effect of panel mass and composite action, the engineered interlocking joint design, and a tested fastening and support methodology. Optional linings and cavity configurations can also be incorporated to meet specific Fire Resistance Rating (FRR) and Sound Transmission Class (STC) requirements.

Systems are non-loadbearing and must be supported by primary structural elements designed in accordance with NZBC structural requirements. Only genuine, tested KOROK® panels and proprietary components guarantee certified system performance. Substituting alternative products may compromise fire and acoustic ratings and cannot be supported or certified.

KOROK Warehouse and Retail Systems

All-in-One Fire & Acoustic Solutions for Boundary and External Walls

KOROK® External Wall Systems are non-loadbearing, fire- and acoustically-rated vertical wall systems combining a zinc-coated steel outer shell with a 400kg/m³ aerated concrete core. BRANZ appraised and designed for New Zealand conditions, they provide durable, high-performance external and boundary wall solutions for commercial and industrial buildings.

Delivering fire rating, acoustic separation, and weather-tight performance in a single integrated assembly, the lightweight system enables faster installation, reduces structural demand, and can eliminate the need for specially engineered slabs on many projects. Available in single-skin or over-clad configurations, the systems are engineered to perform under defined design wind pressures.

How the System Works

The system uses 78mm interlocking panels with a 250mm effective cover width, installed vertically to form a continuous fire- and acoustically-rated barrier. The interlocking geometry limits acoustic leakage while maintaining fire-resisting continuity. The steel shell provides durability and weather protection, and the concrete core delivers inherent fire resistance and acoustic mass. Five system configurations are available:

• EX1 – 78mm COLORSTEEL® panel, single-skin system
• EX2 – 78mm COLORSTEEL® panel with internal fire-rated lining
• EX3 – 78mm panel with engineered over-clad metal system
• EX4 / EX5 – Over-clad systems incorporating internal fire-rated lining

All systems provide two-way fire resistance and are designed as vertical in-fill wall systems fixed to supporting primary structures.

External Wall System Engineered for Commercial and Industrial Applications

KOROK® External Wall Systems are suitable for warehouses, factories, sheds, cinemas, lift shafts, and other commercial applications where fire separation and acoustic control are critical.

EX1 and EX2 systems are appraised as single-skin, non-loadbearing, fire- and acoustically-rated external walls. EX3, EX4 and EX5 systems incorporate drained and vented cavity cladding systems and are subject to project-specific engineering design. The systems are designed for defined wind pressures and vertical span limits, ensuring controlled structural behaviour under service and ultimate limit state conditions.

COLORSTEEL® Options:

Choose from a full range of COLORSTEEL® options to match your project’s external design. Explore our CAD Library for DWG files related to KOROK® External Wall Systems. Access detailed KOROK® External Systems Literature for specifications, installation guides, and more. If you have any questions or need further assistance, contact us for more information.

Durability and Service Life

Service life performance depends on environmental exposure category. COLORSTEEL® MAXAM™ external shells provide up to 25 years resistance to perforation in defined NZS 3604 zones, with paint finish durability of 15 years under normal conditions. Panels are intended to remain rain-washed and fully exposed. Geothermal environments require consultation with the relevant Building Consent Authority.

KOROK® External Wall Systems