As New Zealand’s cities continue to grow upwards, the success of apartment developments is no longer measured by location alone. Occupants increasingly expect homes that are quiet, safe, durable, and comfortable. For architects and developers, achieving this balance requires careful attention to one of the most critical elements of high-density design: the intertenancy wall.
KOROK® Intertenancy Apartment Systems are engineered to help designers meet these expectations, delivering high-performance fire and acoustic separation while supporting efficient construction and long-term building performance.
The Hidden Element That Defines Apartment Living
In apartment buildings, residents may share walls with neighbours they never meet. Yet the quality of those walls directly impacts their daily experience.
Effective intertenancy construction must achieve three key objectives:
- Prevent the spread of fire between occupancies
- Minimise noise transfer between neighbouring apartments
- Provide durability and compliance throughout the life of the building
While these requirements are fundamental to New Zealand Building Code compliance, they also play a significant role in the liveability and perceived quality of a development. Poor acoustic separation can lead to occupant dissatisfaction, while inadequate passive fire protection introduces unnecessary risk.
KOROK® Intertenancy Apartment Systems are specifically designed to address both challenges within a single solid-wall solution.
Engineered for Modern Apartment Construction
Unlike conventional lightweight framed plasterboard systems that rely heavily on linings to achieve fire and acoustic performance, KOROK® panels are themselves the primary fire and acoustic barrier.
The system consists of roll-formed steel-faced panels filled with aerated concrete, creating a solid, high-mass wall that delivers exceptional fire resistance and sound attenuation. Individual panels interlock to form a continuous separation wall between occupancies, providing robust performance that remains inherent within the wall structure itself.
This construction methodology offers significant advantages for apartment projects, including:
- High levels of acoustic privacy
- Robust passive fire protection
- Reduced complexity for service penetrations
- Efficient installation on multi-level developments
- Long-term durability and resilience
Panels are available in lengths of up to 9.3 metres and can be installed either vertically or horizontally, providing flexibility to suit a range of building configurations.
Delivering the Privacy Apartment Residents Expect
One of the most important contributors to apartment comfort is acoustic performance.
As residential buildings become denser, unwanted noise from neighbouring units can significantly affect occupant wellbeing. The aerated concrete core within KOROK® panels provides substantial mass, helping reduce airborne sound transmission and improving low-frequency sound attenuation often associated with everyday apartment living.
KOROK® Intertenancy Apartment Systems can achieve Sound Transmission Class (STC) ratings ranging from STC 55 through to STC 76, enabling designers to select solutions that suit project-specific requirements while exceeding minimum expectations for residential acoustic separation.
The result is a quieter living environment where residents enjoy greater privacy and comfort.
Fire Protection Built Into the Wall
Fire safety remains a critical consideration in multi-unit residential buildings. KOROK® systems provide tested passive fire protection designed to limit the spread of fire between occupancies. Because the fire resistance is inherent within the panel itself, the system offers a robust and reliable approach to compartmentation.
Configurations are available with Fire Resistance Ratings (FRR) from -/60/60 through to -/240/240, giving architects and fire engineers flexibility to meet the requirements of everything from standard apartment developments to complex multi-storey residential and mixed-use projects.
The solid-wall construction also allows electrical outlets, switches, and other services to be installed without requiring individual fire-rated protection at every penetration, simplifying detailing and reducing installation complexity.
Supporting Compliance with Confidence
KOROK® Intertenancy Apartment Systems are BRANZ Appraised and developed to align with recognised Australian and New Zealand Standards. They are designed to meet or exceed the requirements of key New Zealand Building Code clauses relating to:
- Structural performance (B1)
- Durability (B2)
- Fire spread protection (C3)
- Structural stability during fire events (C6)
- Airborne and impact sound control (G6)
With a serviceable life exceeding 50 years under normal dry internal conditions, the system provides confidence for developers, designers, and building owners alike.
A Smarter Solution for High-Density Living
As apartment living continues to play a larger role in New Zealand’s housing future, the importance of well-designed intertenancy construction will only increase.
KOROK® Intertenancy Apartment Systems help create spaces where residents feel protected from noise, safeguarded from fire, and confident in the quality of their surroundings. By combining exceptional fire performance, superior acoustic separation, and construction efficiency in a single solid-wall solution, KOROK® enables architects and developers to deliver apartments designed not only for compliance, but for better living.
When comfort, safety, and performance matter, KOROK® Intertenancy Apartment Systems provide the solid foundation for successful high-density residential design.