The KOROK® Scissor Stair Systems detailed should cover most common situations where fire resistance is required.

KOROK® Scissor Stair Systems are walls constructed from 78mm thick, horizontally and/or vertically oriented KOROK® panels installed between two independent stair stringers in scissor stair configurations.

KOROK® wall systems are self-supporting non-load bearing walls that may be constructed with horizontally or vertically stacked panels, or a combination of both.

The NZBC sets out both the legal minimum sound transmission between tenancies (Clause G6) and minimum levels of fire resistance (Clauses C3 and C6). The KOROK® Scissor Stair Systems Manual provides guidance on the specification and construction of systems that will both meet and exceed those minimum levels.

• NZBC Clause B1 — Structure: The KOROK® Scissor Stair Systems meet the requirements for loads arising from self-weight, earthquake, wind, impact and creep and shrinkage.
• NZBC Clause B2 – Durability: Under normal conditions of dry internal use, KOROK® Scissor Stair Systems have a serviceable life in excess of 50 years and satisfy the requirements of NZBC Clause B2 – Durability.
• NZBC Clause C3 — Fire affecting areas beyond the source: KOROK® Scissor Stair Systems can be used to provide passive fire protection in accordance with the requirements of NZBC Clause 3 – Spread of Fire.
• NZBC Clause C6 — Structural Stability: Compliance with (NZBC) Clause C6 ‘Structural Stability’. In order to satisfy the requirements of the New Zealand Building Code (Clause C6) relating to “structural stability” designers must ensure that KOROK® elements are supported by primary elements that have at least the same fire rating as the KOROK® Scissor Stair System that is used. Where the primary elements supporting the KOROK® Scissor Stair System are outside the f ire cell, there is no requirement to apply the same FRR as the KOROK® Scissor Stair System. Notwithstanding, post fire stability requirements of the NZBC must also be satisfied.
• NZBC Clause F2 — Hazardous Building Materials: KOROK® Scissor Stair Systems meet this requirement and will not present a health hazard to people.
• NZBC Clause G6 — Airborne and Impact Sound: KOROK® Scissor Stair Systems, both meet and exceed the minimum requirements outlined in NZBC Clause G6. Consideration must be given to both the minimum requirements and the comfort of occupants.

KOROK wall systems have been successfully used in New Zealand construction projects across a range of sectors, including commercial, healthcare, education, residential, and public infrastructure. The systems have a proven track record of delivering fire, acoustic, and durability performance when installed in accordance with KOROK requirements. Examples of successful applications are provided in the accompanying case studies and project portfolio:

• Voco-HIE Hotel