KOROK® External Wall Systems
Applications
Custom Made to Order
The KOROK® External Wall Systems EX1 and EX2 have been appraised for use as a single skin, non-load-bearing, fire and acoustically rated external walls for all buildings of importance levels 1 to 5 as defined by AS/NZS 1170. The KOROK® External Wall Systems have been appraised for vertical, straight in-fill panel walls with no penetrations. Housing and communal residential buildings are excluded.
BRANZ Appraisal 722
NZBC Clause B1 – Structure
The KOROK® 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® Intertenancy Systems have a serviceable life in excess of 50 years and satisfy the requirements of NZBC Clause B2 – Durability.
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.
The KOROK® External Wall Systems are designed to be used for buildings situated in specific design wind pressures: EX1 and EX2 systems: 1.76 kPa.
The total height of the KOROK® system is related to the surrounding environment and primary structure. When used as part of a fire-rated system, the maximum unsupported vertical span of the KOROK® 78mm panels for EX systems is 6.0 metres. Greater spans or walls where additional load carrying capacity is required are subject to specific engineering design and/or fire engineering assessment.
KOROK® panels are non-load bearing and are designed to be fixed to supporting structures. In order to satisfy the requirements of New Zealand Building Code (Clause C6) relating to “structural stability during fire”, 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, unless the primary structure lies outside the fire cell.
Frames must be designed to meet the requirements of NZBC Part B and consider the loading imposed on them by the KOROK® wall.
All plasterboard linings must be fixed in accordance with the manufacturer’s instructions.
KOROK® External Wall Systems provide a range of 2-way Fire Resistance Ratings (FRR).
The KOROK® External Wall Systems have been independently tested to ensure compliance with the NZBC requirements.
Maintenance
All cladding products are subject to the cumulative effects of weather, dust and other deposits. KOROK® External Wall Systems are designed and warranted for outdoor use. The product is be maintained in accordance with New Zealand Steel Maintenance and Warranty Literature (www.nzsteel.co.nz/products/).
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This product has no warnings associated with it.
