1. GENERAL
If you have pre-customised this work section using the “questions and answers” provided as part of the downloading process, it may be necessary to amend some clauses to suit the final project-specific version.
The section must still be checked and customised to suit the project being specified, by removing any other irrelevant details and adding project-specific details and selections.
This section relates to the supply and fixing of KOROK® steel clad, lightweight aerated concrete (AC) fire and acoustically rated panels, as a non-load bearing inter-tenancy wall system.
The system is a proprietary high-performance wall that provides horizontal fire and acoustic separation between adjacent tenancies in the same building. The KOROK® Inter-tenancy System is suitable for use in medium and high-density housing, i.e. terraced housing and commercial multi-tenancy units. Modify or extend the above description to suit the project being specified.
1.1 RELATED WORK
Refer to 4259KE KOROK® EXTERIOR WALL SYSTEMS section for exterior wall cladding.
Refer to 5216S KOROK® COMMERCIAL INTERIOR WALL SYSTEMS section for interior walls other than inter-tenancy walls.
Refer to 3421 LIGHT STEEL FRAMED BUILDINGS section for light weight steel support structure.
Refer to 5113G GIB® PLASTERBOARD LININGS section for finishing and stopping of plasterboard linings.
The section(s) stated above are often necessary to support this section, consider carefully and ensure they are included in the project specification if required. Include cross references to other sections where these contain related work. These may include timber and steel framing sections, insulation sections and plasterboard lining sections.
1.2 ABBREVIATIONS AND DEFINITIONS
Refer to the general section 1232 INTERPRETATION & DEFINITIONS for abbreviations and definitions used throughout the specification.
The following abbreviations apply specifically to this section:
| KOROK® | KOROK® Building Systems NZ Ltd. |
| BMT | Base metal thickness |
| AC | Lightweight aerated concrete |
| FRR | Fire Resistance Rating |
| STC | Sound transmission class |
The following definitions apply specifically to this section:
| KIT | KOROK® Intertenancy Terraced Housing |
| KIM | KOROK® Intertenancy Apartments |
| KIR | KOROK® Intertenancy Apartments with Ceiling |
1.3 Documents
Refer to the general section 1233 REFERENCED DOCUMENTS. The following documents are specifically referred to in this section:
NZBC C/AS2 Protection from fire for buildings other than risk group SH
NZBC G6 Airborne and impact sound
NZS 1170.5 Structural design actions – Earthquake actions – New Zealand
AS 1397 Continuous hot-dip metallic coated steel sheet and strip – Coatings of zinc and zinc alloyed with aluminium and magnesium
AS 1538 Cold formed steel structures code
AS/NZS 2589 Gypsum linings – Application and finishing
NZS 3604 Timber framed buildings
Delete from the DOCUMENTS clause any document not cited. List any additional cited documents.
The following are related documents and if referred to in the work section need to be added to the list of DOCUMENTS
BPS Building Product Specifications
NZBC C/AS1 Protection from fire for buildings with sleeping (residential) and outbuildings (risk group SH)
NZBC E2/AS1 External moisture provisions for timber-framed buildings up to 10 m in height
AS 1530.4:2005 Methods for fire tests on building materials, components and structures – Fire-resistance test of elements of construction
AS 3404.1 Steel Structures Standard
AS 3715 Metal finishing – Thermoset powder coatings for architectural applications
BRANZ BU 369 Fitting tolerances
BRANZ BU 519 Fasteners selection
BRANZ BU 531 Providing for thermal and moisture movement
NZS 3602 Timber and wood-based product for use in building
NZS 7202.1 Specification for gap filling adhesives
WorkSafe Guidelines for the provision of facilities and general safety in the construction industry
AS 1530.4:2005 is referenced in NZBC C/AS1-AS2 at the time of writing. AS 1530.4:2014 is the current version but is not cited in the NZBC.
1.4 MANUFACTURER/SUPPLIER DOCUMENTS
Manufacturer’s and supplier’s documents related to this section are:
- BRANZ Appraisal 559 KOROK®FS & NCS Systems
- BRANZ Appraisal 1059 KOROK® 51mm Wall Systems
- KOROK® Intertenancy Apartments Systems Manual
- KOROK® Intertenancy Terraced Housing Systems Manual
List documents relating to this part of the work, i.e. technical product/system specifications, test reports, appraisals, certification, etc. Normally they will be referred to in the text by the abbreviated title.
Manufacturer/supplier contact details
Company: KOROK®Building Systems NZ Ltd.
Web: www.korok.com
Email: info@korok.com
Phone: 0800 773 777
It is important to ensure that all personnel on site have access to accurate, up to date technical information on the many products, materials and equipment used on a project. In most cases individual products are not used in isolation, but form part of a building process. Also a particular manufacturer’s and/or supplier’s requirements for handling, storage, preparation, installation, finishing and protection of their product can vary from what might be considered the norm. Access to technical information can help overcome this potential problem.
Warranties
Use for listing all warranties relating to this section. Supplier and manufacturer warranties are those that are freely offered by the supplier or manufacturer, similarly installers and applicators. They are usually in their standard form and subject to their terms and conditions. Check the general section 1237 WARRANTIES for the date of commencement of warranties; which is normally Practical Completion of the contract, although not all suppliers, manufacture’s, installers or applicators will agree to this. Refer to the chosen conditions of contract as it may also contain information on warranties.
1.5 WARRANTY – MANUFACTURER/SUPPLIER
Provide a material manufacturer/supplier warranty:
15 years: For KOROK® materials
Refer to KOROK® Building Systems NZ Ltd. for details of Materials Warranty.
- Provide this warranty on theKOROK® standard form (if unavailable, use the standard form in the general section 1237WA WARRANTY AGREEMENT)
- Commence the warranty from the date of Practical Completion of the contract works.
Refer to the general section 1237 WARRANTIES for additional requirements.
Modify or expand the clause to suit project or manufacturer/supplier requirements, eg:
- Modify the form to be used
- Commence the warranty from the date of purchase (check with the manufacturer/supplier)
1.6 WARRANTY – INSTALLER/APPLICATOR
Provide an installer/applicator warranty:
2 years: For workmanship
- Provide this warranty on the installer/applicator standard form (if unavailable, use the standard form in the general section 1237WA WARRANTY AGREEMENT)
- Commence the warranty from the date of Practical Completion of the contract works.
Refer to the general section 1237 WARRANTIES for additional requirements.
Modify or expand the clause to suit project requirements, options include:
- Commence the warranty from the date of completion of this part of the contract work
Requirements
1.7 QUALIFICATIONS GENERALLY
Refer to the general section 1270 CONSTRUCTION for requirements relating to qualifications.
1.8 ACCEPTABLE PRODUCT/MATERIAL SUPPLIERS
Where a product or material supplier is named in SELECTIONS, the product/material must be provided by the named supplier. Where there is more than one named supplier, any one of the named suppliers will be acceptable. Refer to other manufacturers details for specific information on their products.
This clause is used to nominate a supplier or suppliers to supply materials. It is not intended for nominating subcontractors which must be done in the specific conditions of contract applying to the work. Check with BCA for acceptability of multiple selection options.
Modify this clause to suit project requirements. Add references to other sections in the specification as appropriate.
1.9 NO SUBSTITUTIONS
Substitutions are not permitted to any of the specified systems, components and associated products listed in this section.
1.10 INFORMATION FOR OPERATION AND MAINTENANCE
Where KOROK® panels are exposed, an inspection should be carried out at least annually to ensure that no undue degradation is occurring. Where corrosion is identified, the cause must be determined and repairs made to restore the integrity of the system.
Where KOROK® panels are not exposed, no maintenance should be required. Damage to linings or claddings should be repaired immediately.
Performance
Note that in using the next clause you are setting a standard of performance for the contractor to meet. Specifiers should therefore consider adding some means of confirming (e.g.by testing or certification) that the performance criteria will be or have been met.
1.11 NOISE CONTROL TESTS
KOROK® noise control testing and results were found to be satisfactory by BRANZ for NZBC G6/AS1 as noted in BRANZ Appraisal 559 – KOROK® FS & NCS Systems and BRANZ Appraisal 1059 – KOROK® 51mm Wall Systems.
It is important to consider the requirements for the acoustic design of any surrounding systems; their performance must be at least equivalent to that required of the panels themselves.
1.12 SURFACE FIRE PROPERTIES FOR LININGS
Group Number to NZBC C/AS2, Table 4.12.1.1: Maximum permitted Group Number for internal surface finishes. Refer to SELECTIONS.
NOTE: For most internal applications a surface fire performance Group Number will be required to NZBC C/AS2, Table 4.12.1.1: Maximum permitted Group Number for internal surface finishes (services to Table 4.12.6.2: Maximum permitted Group Number for the surfaces of building services). If the Group number is established from BPS, Table 8.5.2.1: Material Group Numbers for some substrate and coating combinations, modify the clause.
Delete clause if not required. A Group Number may not be required in situations such as, the surface area is less than 5m² (NZBC C/AS2, paragraph 4.12.4.1 (a)), or the design is to NZBC C/AS1 risk group SH (houses etc).
Compliance Information
1.13 INFORMATION REQUIRED FOR CODE COMPLIANCE
Provide the following compliance documentation: –
- Installer’s approval certificate from the product manufacturer / importer / distributor
- Manufacturer / supplier warranty
- Installer / applicator warranty
- Producer Statement – Construction (PS3) from the applicator / installer
- Producer Statement – Construction Review (PS4) from a suitably qualified person
- Other information required by the BCA in the Building Consent Approval
List the Producer Statements – Construction (PS3) required from installers that are required as a condition of carrying out this work.
List also Producer Statements – Construction Review (PS4) required from consultants to be engaged by the Contractor.
Producer Statement – Design (PS1), may be required where certain design work is undertaken by the Contractor or manufacturer / importer / distributor.
Quality control and assurance
1.14 INSPECTIONS
Allow to inspect the whole of the work at each stage. Determine a programme for inspections including notification when each part and stage of the work is ready for inspection prior to the work commencing. Permit representatives of KOROK® to inspect the work in progress and to take samples of their product from site if requested. Refer to KOROK® Technical and Installation Manual.
Use this clause for parts of the work where;
Special arrangements are required for notification for inspections.
These inspections may include ‘Hold Points’ or ‘Notification Points’. Refer to 1232 INTERPRETATION & DEFINITIONS for complete definitions.
Hold Point: Work may not proceed until the work in question has been inspected.
Notification Point: Notify Contract Administrator, work may be observed or not, work may proceed.
or
the manufacturer/supplier is required to carry out inspections outside their normal activities and provide reports or other documents in support of the work carried out.
or
the Contractor is required to carry out or engage consultants to carry out inspections of parts of the work. It will typically be expected that the person carrying out the inspections will be required to provide producer statements in support of the work carried out.
2. PRODUCTS
Materials – general
2.1 KOROK® PANELS
Tongue-&-groove jointed cold roll formed steel shells to AS 1538 and galvanized to AS 1397, filled with proprietary aerated concrete infill. Paint coated steel coil can also be used on one or both sides.
Panel size nominal: 250mm wide, 51mm or 78mm thick
Panel length: made to measure up to 9.4m (78mm Gen2); 9.0m (78mm Gen1); 5.0 (51mm)
Panel density: 400kg/m³, 600kg/m³, 800kg/m³ or 1000kg/m³
Metal thickness: 0.4mm BMT
Modify this clause to suit project requirements. Custom panel lengths can be made up to 9.0m but panel spans for fire rated systems are generally limited to a maximum of 6.0m, unless specifically designed. Standard panel density is 600kg/m3 for 51mm panel and 400kg/m³ for 78mm panel. Refer to KOROK® Building Systems NZ Ltd for further information.
2.2 KOROK® TRACKS
KOROK® ‘C-track’ and KOROK® Angle, cold roll formed steel to AS 1538 and galvanized to AS 1397, form the edges and perimeters of the panels. May be powder coated.
C-track: 60mm x 80mm web
Angle: 60mm x 60mm
Metal thickness: 1.15mm BMT
Track length: up to 3.6m.
Refer to KOROK® Manuals for fixing details
2.3 KOROK® FIRE FLASHING
KOROK® Fire Flashing, cold roll formed steel to AS 1538 and galvanized to AS 1397, used as part of the head detail for the KOROK® fire rated systems.
Fire Flashing: 110mm
Metal thickness: 0.55mm BMT
Track length: up to 3.6m.
Refer to KOROK® Manuals for fixing details
2.4 KOROK® KIT FLASHING
KOROK® KIT Flashing, cold roll formed steel to AS 1538 and galvanized to AS 1397, used as part of the horizontal joint detail for the KOROK® fire rated systems.
KIT Flashing: 160mm
Metal thickness: 0.55mm BMT
Track length: up to 3.6m.
Refer to KOROK® Manuals for fixing details
Components
Modify the following component clauses to more accurately describe the project design.
2.5 SCREW FIXINGS
Self-drilling, self-tapping to suit the member, connection method and location. Refer to KOROK® manuals for fixing details and the fixing manufacturers information.
| Location | Type |
| C-track to concrete | |
| C-track to steel | Hilti® X DN1 16MX nail |
| Track to panel | 10×16 and 10×30 galvanized Steeltite™ wafer head screws |
| Panel to panel | 10×16 and 10×30 galvanized Steeltite™ wafer head screws |
Refer to KOROK® Manuals for fixing details
2.6 POWDER ACTUATED FASTENERS
To type, size and charge required by the powder actuated tool manufacturer, to suit the member, connection method and location. Refer to KOROK® Technical and Installation Manual, and the fixing manufacturer’s printed data.
Refer to KOROK® manuals for fixing details
2.7 FIRE SEALANT
KOROK® Fire Rated Sealant – Sikaflex® 400, Hilti® CP606 or PROMASEAL-A®
Consult with KOROK® Building Systems NZ Ltd if excessive movement is anticipated.
Accessories
2.8 LIGHT STEEL FRAMING
To NASH Standard Part 2, Appendix D. Member Classifications and section 2. Materials & Members. Cold roll formed steel sections galvanized to AS 1397. Refer to 3421 LIGHT STEEL FRAMED BUILDINGS.
Delete/modify if specified in another section or if not required. Refer to SELECTIONS.
2.9 TIMBER FRAMING
Timber framing to NZS 3604. Refer to 3821 TIMBER FRAMING.
Delete/modify if specified in another section or if not required. Refer to SELECTIONS.
2.10 GIB® PLASTERBOARD LINING
Gypsum plaster core encased in a face and backing paper formed for standard and water resistance use to AS/NZS 2588. Refer to 5113G GIB PLASTERBOARD LININGS and 5171G GIB PLASTERBOARD FIRE & SOUND BOARD.
Refer to KOROK® manuals for fixing details.
2.11 PINK BATTS INSULATION
Pink® Batts® Silencer® bio-soluble glass wool manufactured from up to 80% recycled glass in slabs and coloured grey for identification. Refer to 4710P PINK® BATTS® THERMAL & ACOUSTIC INSULATION.
Delete/modify if specified in another section or if not required. Refer to SELECTIONS
2.12 GREENSTUF® POLYESTER FIBRE MASONRY WALL ACOUSTIC BLANKET INSULATION
GreenStuf® Masonry Wall Blanket – 100% polyester fibres thermally bonded to form a flexible blanket/roll for thermal insulation and control of sound transmission in strapped and lined masonry walls. Refer to 4721AG AUTEX GREENSTUF ACOUSTIC INSULATION.
Delete/modify if specified in another section or if not required. Refer to SELECTIONS
2.13 GREENSTUF® SOUND SOLUTION® PLUS INSULATION
Acoustic insulation blanket used as ceiling overlay in commercial applications or for intertenancy walls. Refer to 4721AG AUTEX GREENSTUF ACOUSTIC INSULATION.
Delete/modify if specified in another section or if not required. Refer to SELECTIONS
2.14 BRADFORD ACOUSTIGARD™ INSULATION
Bradford™ Acoustigard™ Partition Blanket Lightweight acoustic blanket. Refer to 4721B BRADFORD® ACOUSTIC INSULATION.
Delete/modify if specified in another section or if not required. Refer to SELECTIONS
3. EXECUTION
Conditions
3.1 DELIVERY, STORAGE & HANDLING OF PRODUCTS
Refer to 1270 CONSTRUCTION for requirements relating to delivery, storage and handling of products.
Use this standard generic clause and if appropriate add special requirements.
3.2 ROUTINE MATTERS
Refer to the general section 1250 TEMPORARY WORKS & SERVICES for protection requirements. Refer to 1270 CONSTRUCTION for requirements relating to defective or damaged work, removal of protection and cleaning.
Use this standard generic clause and if appropriate add special requirements.
3.3 SUBSTRATE
Carry out all necessary inspections and preparatory work to the supporting elements of the KOROK® Inter-tenancy System prior to installation. Do not commence work until the framing is plumb, level and to the standard required by AS/NZS 2589 and KOROK® Inter-tenancy System requirements.
3.4 TIMBER FRAME MOISTURE CONTENT
Maximum allowable moisture content to AS/NZS 2589 Gypsum linings – Application and finishingfor timber framing at lining: 18% or less for plasterboard linings.
3.5 STANDARDS AND TOLERANCES
Refer to the general section 1270 CONSTRUCTION for general requirements.
Amend this clause to describe specific standards and tolerances to be achieved in carrying out this part of the work. Although such tolerances are typically included in standards (NZS, AS/NZS, etc.) in certain circumstances it is worth restating these in this clause.
3.6 FIXINGS – EARTHQUAKE
Use fixings and methods capable of sustaining the loads appropriate to the earthquake zone as required by NZS 1170.5 Structural design actions – Earthquake actions.
This clause might only apply where the method of fixing the panels is required, by design or regulation, to comply with the earthquake requirements of NZS 1170.
3.7 SOUND RATING
Refer to KOROK® Inter-tenancy System literature for correct forming and treating of penetrations, to ensure the specified acoustic performance is met. Ensure absence of adjoining flanking paths.
Installation: KOROK Systems
3.8 INSTALL PANELS
Install KOROK® panels in accordance with the KOROK® Intertenancy Systems Manual.
3.9 FIX KOROK® FIRE FLASHING
Install KOROK® fire flashing to top C-track, in accordance with the KOROK® Intertenancy Systems Manual.
3.10 FIX KOROK® KIT FLASHING
Install KOROK® kit flashing to horizontal joints, in accordance with the KOROK® Intertenancy Systems Manual.
3.11 ALIGNMENT OF FRAMING
To the standard required by KOROK®, plumb, level and in true alignment.
Use this standard generic clause and if appropriate add special requirements.
3.12 FIRE REQUIREMENTS
To maintain fire rating and integrity of the areas noted as ‘fire rated’ on the drawings between residential units, comply with all relevant aspects of the KOROK® Inter-tenancy System literature according to the fire resistance rating (FRR) and other relevant product manufacturers’ recommendations.
3.13 SERVICES
Piped and cabled services within KOROK® Inter-tenancy System framing cavities to be securely fastened to the framing, and must not be in contact with, or pass through, the central barrier. Minimum 10mm clearance must be provided between any plumbing or electrical services and the central barrier.
3.14 ACOUSTIC REQUIREMENTS
To maintain acoustic integrity of the areas noted as ‘sound rated’ on the drawings, comply with all relevant aspects of the KOROK® Intertenancy System literature according to the specified sound transmission class (STC) rating and other relevant product manufacturers’ recommendations.
3.15 PENETRATIONS
Under no circumstances should any services penetrate the KOROK® Intertenancy System panels unless approved by a Fire Engineer. Services may however be concealed within the framed section of the wall system, subject to the following constraints:
- Minimum of 10mm clearance to be maintained between any penetrations and the central
- Penetrations to be no larger than 65mm diameter or 90mm x 50mm through the plasterboard There is no requirement to firestop these penetrations.
- No more than two penetrations per 600mm bay of framing to be
3.16 PRIMING STEEL
Use either Resene Galvo-Prime or Zinc rich spray primer to ensure that all exposed steel has been spot primed.
Available from KOROK® or Resene Color Shops, or other selected merchants. Refer to relevant Resene documents for application.
Finishing: general
3.17 FINISHING AND STOPPING
Refer to and AS/NZS 2589 Gypsum liningsand 5113G GIB® PLASTERBOARD LININGS section for finishing and stopping of plasterboard linings.
Completion & Commissioning
3.18 Refer to 1270 CONSTRUCTION for completion requirements and if required commissioning requirements.
Use this standard generic clause and if appropriate add special requirements.
3.19 COMPLETION – TESTS & CERTIFICATION
Refer to the general section 1270 CONSTRUCTION for general test and certification requirements at completion.
Expand this clause to detail specific requirements for tests and certification required on completion of this section of work. For example acoustic tests, thermal testing, leak testing etc. Nominate the person that test results and / or certification is to be submitted to. Co-ordinate with the INSPECTIONS clause if required to link testing with a Hold Point or Notification Point. Delete this clause if there are no testing / certification requirements.