High Performing and Lightweight

KOROK® 78mm galv panels are precision rollformed from high-quality zinc-coated steel strips. The steel used for our shells meets the AS/NZS1397:2001 standard, ensuring consistent strength and durability. Each panel features a base metal thickness of 0.4 mm B.M.T. with a Z275 zinc coating, enclosing a lightweight aerated concrete core. This combination delivers a nominal weight of just 10.2 kg per lineal metre, making KOROK® panels easy to handle and install while maintaining exceptional structural performance.

Our panels are designed for versatility and high performance, offering superior fire and acoustic ratings for a wide range of applications. They provide fast, efficient installation with minimal on-site modifications, reducing labour costs and program delays. The lightweight nature of KOROK® panels also eases transport and handling, particularly on multi-storey construction projects.

Backed by over 20 years of experience, KOROK® panels are BRANZ-appraised, Kiwi-owned, and widely trusted across New Zealand for projects ranging from residential developments to complex commercial constructions. Our systems are designed to simplify installation, maximise safety, and deliver long-lasting performance, making KOROK® the preferred choice for builders, architects, and developers seeking reliable fire and acoustic wall solutions.

High Performing and Lightweight

51mm KOROK® panels are rollformed from zinc coated steel strips. The steel from which the shells are manufactured conforms to AS/NZS1397:2001. Steel shells have a base metal thickness of 0.4mm B.M.T. with a Z275 zinc coating. These panels have an aerated concrete core and weigh nominally 10.2kg per lineal metre.

KOROK® produces 51mm panel. KOROK® 51mm panel provides a -/60/60 FRR and is perfectly suited for terraced house intertenancy walls and apartment intertenancy walls.  The narrower gauge allows you to keep more floor space as it isn’t taken up by walls.

Performance and Features

• Fire Rating: KOROK® 51mm panels provide a fire resistance rating of -/60/60 FRR, meeting stringent safety requirements for intertenancy walls in terraced houses and apartments.
• Acoustic Efficiency: Designed to reduce sound transmission, these panels ensure quieter living environments, making them an excellent choice for densely populated or high-traffic areas.
• Space-Saving Design: The 51mm thickness allows for slimmer walls, helping to maximize valuable floor space without compromising structural integrity or performance.

KOROK® 51mm Galv panels are used for:

• KOROK® Intertenancy Terraced Housing Wall Systems
• KOROK® Intertenancy Apartment Wall Systems

Applications and Systems

• Vertical Orientation: Panels are installed vertically and secured to timber or steel framing with aluminum brackets.
• Versatility: Compatible with wall framing, insulation, and linings specified within the system appraisal, ensuring seamless integration into your building project.
• Scope of Use: Appraised for all buildings of all importance levels as defined by AS/NZS 1170.

Engineered Solid Intertenancy Walls for Multilevel Compliance

In apartment and multi-unit developments, intertenancy walls must provide more than separation – they must deliver reliable fire containment, acoustic privacy, and long-term durability. KOROK® Intertenancy Apartment Systems provide high-performance fire- and acoustic-rated protection for non-loadbearing internal walls. Designed for compliance, construction efficiency, and occupant comfort, the system delivers robust solid-wall performance while meeting the requirements of the New Zealand Building Code (NZBC).

Designed for use in:

• Apartment buildings
• Multi-storey residential developments
• Hotels and retirement complexes
• Mixed-use multi-unit projects

With fire ratings available up to -/240/240 and acoustic performance up to STC 76, the system provides flexibility for designers while delivering reliable, tested performance. BRANZ appraised and developed using recognised Australian and New Zealand Standards, KOROK® systems combine solid-wall resilience with construction efficiency.

How the System Works

KOROK® Intertenancy Apartment Systems use roll-formed steel-faced panels filled with aerated concrete to form a solid, high-mass fire and acoustic barrier between occupancies. The panels interlock to form a continuous wall with inherent fire resistance and sound attenuation properties. Unlike lightweight framed plasterboard systems that rely on linings for performance, the KOROK® panel itself is the primary fire barrier.

The aerated concrete core provides substantial mass, improving low-frequency sound attenuation and reducing airborne sound transfer between dwellings. The solid wall configuration also allows services to be run on the intertenancy wall without requiring individual fire-rated penetrations for outlets and switches, as fire resistance is inherent within the panel. Panels may be installed vertically or horizontally and are available in multiple configurations to achieve varying Fire Resistance Ratings (FRR) and Sound Transmission Class (STC) levels.

KOROK Intertenancy Apartment Systems

Quick to Install, Built to Protect

In modern terraced housing and townhouses, intertenancy walls must do more than divide spaces – they must protect lives, property, and privacy. The KOROK® Intertenancy System delivers high-performance fire- and acoustic-rated protection walls that’s fast to install, robust, and fully compliant with both the New Zealand Building Code (NZBC) and the Building Code of Australia (BCA).

How the System Works

The KOROK® system uses steel-shelled, aerated-concrete panels positioned between double wall frames. Aluminium brackets connect the panels to both sides. In the event of a fire, brackets on the fire-exposed side melt – allowing that side to safely detach – while the opposite side remains intact. This keeps the fire barrier securely in place, maintaining structural stability and preventing fire spread to the neighbouring unit. Unlike conventional wall systems that rely on internal plasterboard linings for protection, the KOROK® panel itself is the primary fire barrier, providing enduring strength and resilience.

Engineered for Modern Terraced Living

Whether you’re building townhouses, apartments, or multi-unit developments, KOROK® Intertenancy Systems combine i with construction efficiency – delivering fire safety, acoustic comfort, and peace of mind for occupants and builders alike.

KOROK Intertenancy Terraced Housing Systems