• Fire ratings up to 120/120/120
• Acoustic ratings up to STC 69

The KOROK 51mm Wall System and KOROK KIT Wall Systems are used to construct fire and acoustically rated walls and partitions within building envelopes.

The KOROK panels are made from aerated concrete encased in profiled galvanised steel sheet formwork and are non-loadbearing, whilst the structural elements of the wall system can be loadbearing.

BRANZ Appraisal 1059 [2019] Scope:

• The KOROK 51mm Wall System and KOROK 51mm Wall System and KOROK KIT Wall Systems have been appraised for use as non-loadbearing fire and acoustically rated internally located walls and partitions for all buildings of all importance levels as defined by AS/NZS 1170
• The KOROK KIT Wall System panels are installed in vertical orientation. For the intertenancy wall systems the panels are fixed to the timber or steel framing with aluminium brackets at the panel face or joints at maximum 3.5m intervals vertically and 0.6 m intervals horizontally. The total height of the KOROK panels in a single wall must not exceed 14m
• For the KOROK 51 mm plain wall panel the maximum unsupported span for the panels between structural supports is 8m. The overall height or length of a KOROK 51mm plain wall will be determined by the structural support. When used as part of a fire rated system, the maximum unsupported span of the KOROK panels is 6m for vertical orientation and 4m for horizontal orientation. Greater spans are subject to specific engineering design and/or fire engineering assessment and are outside the scope of this Appraisal.
• The KOROK 51mm Wall System and KOROK KIT Wall Systems have been appraised for use in intertenancy walls when used with the wall framing, wall insulation and wall lining specified in this Appraisal.

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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 Intertenancy Systems Manual provides guidance on the specification and construction of systems that will both meet and exceed those minimum levels. However, designers should consider the comfort of occupants when selecting a system that will satisfy the occupants’ expectations when using the space rather than the minimum required by law.

NZBC:

• Clause B1: Structure — The KOROK Systems meet the requirements for loads arising from self-weight, earthquake, wind, impact and creep and shrinkage
• Clause B2: Durability — Under normal conditions of dry internal use KOROK Intertenancy Systems have a serviceable life in excess of 50 years and satisfy the requirements of NZBC B2 Durability
• Clause C3: Fire Affecting Areas Beyond the Source — KOROK Intertenancy Systems can be used to provide passive fire protection in accordance with the requirements of Clause C3
• Clause C6: Structural Stability — Compliance with (NZBC) Clause C6 ‘ Structural Stability’. In order to satisfy the requirements of the New Zealand Building Code (clause 6) 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 system that is used.
  Where the primary elements supporting the KOROK system are outside the fire cell, there is no requirement to apply the same FRR as the KOROK system.
  Notwithstanding, post fire stability requirements of the NZBC must also be satisfied
• Clause G6: Airborne and Impact Sound — KOROK Intertenancy Systems, both meet and exceed the minimum requirements outlined in NZBC Clause G6. Consideration should be given to both the minimum requirements and the comfort of occupants.

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BRANZ Appraised

• Fire ratings up to –/240/240
• Acoustic ratings up to STC 76

Along with External and boundary walls for sheds, factories and warehouses, KOROK systems are suitable for:

• Dividing walls for sheds, factories and warehouses
• Cinema walls
• Intertenancy walls for apartments, hotels and retirement complexes
• Lift shaft, stair and duct walls
• Acoustic barriers
• External and boundary walls for sheds, factories and warehouses
• Terraced housing intertenancy

KOROK systems are suitable for all areas of New Zealand

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• CLAUSE B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4. The KOROK External Wall System meets the requirements for loads arising from self-weight, earthquake, wind, impact and creep and shrinkage [i.e. B1.3.3 (a), (f), (h), (i), (j) and (q)].
• CLAUSE B2 DURABILITY: Performance B2.3.1 (b), 15 years, Performance B2.3.1 (c), 5 years. The KOROK External Wall Systems meet these requirements.
• CLAUSE C3 FIRE AFFECTING AREAS BEYOND THE FIRE SOURCE: Performance C3.4, C3.5 andC3.6. The KOROK External Wall Systems will meet or contribute to meeting these requirements.
• 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 system that is used.
  Where the primary elements supporting the KOROK system are outside the fire cell, there is no requirement to apply the same FRR as the KOROK® system. Notwithstanding, post fire stability requirements of the NZBC must also be satisfied
• CLAUSE E2 EXTERNAL MOISTURE: Performance E2.3.2. The KOROK External Wall Systems will meet this requirement
• CLAUSE F6 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. The KOROK External Wall Systems meet this requirement and will not present a health hazard to people.

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BRANZ Appraised