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 Hermpac Horizontal cladding:
Modify or extend the above description to suit the project being specified.
Clauses for pre-priming under paint finish and pre-coating under clear or semi-transparent finishes are included here.
For control of external fire spread refer to NZBC C/AS1 & NZBC C/AS2 for requirements. For all risk groups other than SI care or detention) NZBC C/AS1, 5.3 External cladding systems and NZBC C/AS2, 5.8 External cladding systems allow cladding materials to be exempt from testing if located at a distance greater than or equal to 1.0m from a relevant boundary with a building height less than 10m. For cladding material locations outside this scope refer to the appropriate acceptable solution for testing requirements (contact manufacturer to establish if testing has occurred).
In relation to fire rating requirements of external walls refer to NZBC C/AS1, 5.1.1 Fire rating of external walls or NZBC C/AS2, 5.3 FRRs of external walls as appropriate.
Refer to ~ for ~.
Include cross references to other sections where these contain related work.
Refer to 4383H Hermpac Timber Decking System
Refer to 4221HA Hermpac Accoya® Horizontal Weatherboard Cladding System
Refer to 4221HB Hermpac Accoya® Vertical Weatherboard Cladding System
Refer to 4221HV Hermpac Vertical Weatherboard Cladding System
Refer to 5124HL Hermpac Interior Timber Linings
Refer to 6311HF Hermpac Flooring
Refer to 6743FB Zone FireZone Vanguard Timber Fire Treatment
Refer to 6743ZE Zone FireZone F1E Exterior Intumescent Timber Coating
Refer to painting sections for finishes to weatherboard cladding.
Refer to the general section 1232 INTERPRETATION & DEFINITIONS for abbreviations and definitions used throughout the specification.
The following abbreviations apply specifically to this section:
FSC® | Forest Stewardship Council® |
Programme for the Endorsement of Forest Certification |
Delete abbreviations or definitions that are not used.
CSA | Canadian Standards Association (International Standards) |
SFI | Sustainable Forestry Initiative |
Refer to the general section 1233 REFERENCED DOCUMENTS. The following documents are specifically referred to in this section:
NZBC B2/AS1 | Durability |
NZBC E2/AS1 | External moisture |
Timber and wood-based products for use in building | |
Timber-framed buildings | |
Profiles of weatherboards, fascia boards and flooring | |
BRANZ BU 411 | Recommended Timber Cladding Profiles |
JAS-ANZ CodeMark Certification CMNZ30037 - Hermpac Rusticated, Splaycut and Multi-Splay Weatherboard Cavity System
JAS-ANZ CodeMark Certification CMNZ30038 - Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System
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.
NZBC C/AS1 | Protection from fire |
NZBC C/AS2 | Protection from fire |
Guide to Window Installation as described in E2/AS1 | |
BRANZ BU 468 | Fixing timber weatherboards |
BRANZ BU 519 | Fasteners selection |
BRANZ BU 526 | Specifying timber |
BRANZ BU 567 | E2/AS1 Flashing Requirements |
BRANZ BU 570 | Ground clearances |
BRANZ BU 575 | Timber treatment |
BRANZ BU 673 | Cavity battens |
BRANZ publication | Selecting wall claddings |
BRANZ Good practice guide - Timber cladding
Hermpac Bevelback & Rebated Bevelback Weatherboard Cavity System Installation Specifications
Hermpac Bevelback & Rebated Bevelback Weatherboard Direct Fix System Installation Specifications
Hermpac Product Installation Checklist – Bevelback and Rebated Bevelback Weatherboard Cavity System (Aug 2023 V2)
Hermpac Product Technical Statement (PTS) – Bevelback & Rebated Bevelback (July 23)
Hermpac Rusticated, Splaycut & Multi-Splay Weatherboard Cavity System Installation Specifications
Hermpac Rusticated, Splaycut & Multi-Splay Weatherboard Direct Fix System Installation Specifications
Hermpac Product Installation Checklist – Rusticated, Splaycut & Multi-Splay Weatherboard Cavity System (Aug 2023 V2)
Hermpac Product Technical Statement (PTS) – Rusticated, Splaycut and Multi-Splay (July 23)
Hermpac Standard and Custom Profiles
Hermpac Profile Portfolio
Hermpac Nail/Screw fixings
Machinecoat - Flood Coat Inundation versus Spray Application
Maintenance of selected Wood Oil / Oil Based Stain finishes
Hermpac WRC Information Sheet – cuts and characteristics
Hermpac WR & Yellow Cedar cuts and characteristics
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.
Technical profile drawings and timber species samples (raw or coated) are available on request from Hermpac Ltd. Contact technical@hermpac.co.nz.
Manufacturer/supplier contact details
Company: | Hermpac Ltd |
Contacts: | Kyle Deans - 021 771 857, kyle.deans@hermpac.co.nz |
| Carmen Hansen - 027 809 4588, carmen@hermpac.co.nz |
Web: | |
Email: | technical@hermpac.co.nz |
Telephone: | 09 421 9840 Auckland |
| 04 586 9674 Wellington |
| 03 341 2163 Christchurch |
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.
Provide an installer/applicator warranty:
5 years | For installation of Hermpac horizontal weatherboard cladding systems |
Refer to the general section 1237 WARRANTIES for additional requirements.
Modify or expand the clause to suit project or installer/applicator requirements, options include:
Refer to 1270 CONSTRUCTION for requirements relating to qualifications.
Hermpac horizontal weatherboard cladding systems meet the requirements of the NZBC when used within the Conditions and Limitations of their Certificates.
The certificates provide third party compliance to NZBC Clauses and standards specified within the certificate, provided that design and installation of the system is in accordance with the stated conditions and limitations of use. The designer is required to provide a signed declaration for submission with the building consent application that the use of Hermpac horizontal weatherboard cladding systems in the proposed building work falls within the scope of the CodeMark certificate and that all design conditions of the certificate have been met.
Provide the following compliance documentation: -
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.
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 (say by testing or certification) that the performance criteria will be or has been met.
Design and use the fixings appropriate for the wind zone (R) and topographical classification (T) of this site and building height; as required by NZS 3604.
Accept responsibility for the weather-tight performance of the completed cladding system, including all penetrations. To NZBC B2/AS1 Durability and NZBC E2/AS1 External moisture.
Refer to later EXECUTION clause on co-operating with others on the installation of elements which penetrate the cladding system; including windows and doors, sundry elements fixed through the cladding surface, service pipework, etc.
Select the product that suits the brief and use the PRODUCTS and EXECUTION clauses that follow to suit the product selected.
Hermpac Canadian Western Red Cedar (Thuja plicata) supplied from sustainably managed forests of British Columbia, Canada and available with PEFC or FSC certification.
Hermpac Canadian Yellow Cedar (Chamaecyparis nootkatensis) supplied from sustainably managed forests of British Columbian coast, through to Alaska and available with PEFC or FSC certification.
Hermpac DuraLarch™ (Larix Sibirica), FSC certified timber supplied from sustainably managed Northern European forest sources.
NB: To meet the provisions of the New Zealand Building Code (clause B2: Durability) DuraLarch™ must be coated (oil, stain or paint).
Hermpac Single Species AshinDura™, Quarter Sawn timber supplied from sustainably managed forests of British Columbia, Canada and available with PEFC or FSC certification.
AshinDura™ is specific to Hermpac. Forest sources certified legal and sustainable under one or more independent third party verified certification systems (PEFC, CSA, SFI orFSC). PEFC is the primary third party certification system for AshinDura™. If FSC is required, please contact Hermpac.
NB; To meet the provisions of theNew Zealand Building Code(clause B2: Durability) AshinDura™ must be treated and painted. This product is supplied by Hermpac treated, pre-primed and undercoated (via Machinecoat NZ), with top coats being applied on-site.
Hermpac Kanda (Beilschemiedia ssp), FSC certified timber supplied from sustainably managed forests of Central Africa.
Note: Kanda is limited to one horizontal profile, ex. 150mm x 25mm bevelback profile (HP61). Available with a clear finish coat. Requires fixing with Hermpac starcap screws as per Hermpac Kanda construction drawings.
Weatherboards to Hermpac profiles, Lap and Rebate details to BRANZ BU 411 and general design to the NZS 3617, species and grading to NZS 3602, table 2, reference 2A.1, Requirements for wood-based building components to achieve a 15-year durability performance. Weatherboards in lengths relative to profile selection and application, with all unsound and open split knots excluded by cross cut removal prior to fixing into position.
Acceptable Solution is limited to the following types of weatherboards and their derivatives:
A selection of the above profiles are also available in Western Red Cedar and Yellow Cedar finger-joint (CedarOne Evolve and CedarLine Evolve). CedarOne Evolve is quarter-sawn cut Cedar. CedarLine Evolve is primarily flat-sawn cut Cedar. Evolve profiles are available across most standard and custom profiles. The timber is machined with a “combed” finish to the front face and the boards are finished with an oil or stain as per Hermpac Iiterature.
Regular paint finish finger-joint (CedarOne Mantle and CedarLine Mantle) is also available in Western Red Cedar and Yellow Cedar. Profiles are machined with a “dressed” finish to the front face and the exposed corners are machined to paint quality - PQ (ie. rounded edges for paint adherence). Boards are supplied pre-primed and undercoated, sanded and/or de-nibbed/buffed between coats.
A selection of the above profiles are also available in AshinDura™. Profiles are machined with a “dressed” finish to the front face and the exposed corners are machined to paint quality – PQ (ie. rounded edges for paint adherence). Boards are supplied pre-primed and undercoated, sanded and/or de-nibbed/buffed between coats.
To Hermpac profiles as detailed, with species and grading to NZS 3602, but with all unsound and open split knots excluded by cross cut removal prior to fixing into position. To NZS 3602, table 2, reference 2A.3, Requirements for wood-based building components to achieve a 15-year durability performance.
Not currently available in CedarOne/CedarLine.
To Hermpac profiles, with species and grading to NZS 3602, but with all unsound and open split knots excluded by cross cut removal prior to fixing into position. To NZS 3602, table 2, reference 2A.3, Requirements for wood-based building components to achieve a 15-year durability performance.
Not currently available in CedarOne/CedarLine.
For flexible wall underlays, rigid wall underlays and rigid air barriers, refer to the appropriate separate section(s).
Radiata Pine H3.1 minimum, merchant grade battens, 20mm x 45mm, 40mm x 45mm and 45mm x 40mm, height to match timber framing studs. Refer to SELECTIONS.
Use cavity battens where required by NZBC E2 /AS1 table 3.
Radiata Pine H3.2 Micropro treated square dressed battens, 40mm deep x 45mm wide and 45mm deep x 40mm wide, height to match timber framing studs. Refer to SELECTIONS.
Use cavity battens where required by NZBC E2 /AS1 table 3. For structurally fixed battens to Blockwork, Steel Framing, Concrete or other substrates contact Hermpac for guidance.
Note: H3.2 CCA treated timber is not suitable for use in contact with aluminium flashings.
Hermpac cavity battens H3.2 are Micropro treated - no separation required between cavity battens and aluminium flashings.
Aluminium, PVC or stainless-steel cavity closure strip, punched with 3mm - 5mm holes or slots to provide a minimum ventilation opening area of 1000mm² per lineal metre of wall. Length and width to suit cavity. To NZBC E2/AS1: clause 9.1.8.3 and figure 66.
Delete this clause if specifying direct fix.
Hermpac Crown, Rose or Flat Head, Annular Grooved Silicon bronze fixings to NZBC E2/AS1 Table 24. Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
Delete if specifying Stainless Steel nails.
Hermpac Crown, Rose or Flat Head, Annular Grooved Grade 316 Stainless steel fixings to NZBC E2/AS1 Table 24. Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
Delete if specifying Silicon Bronze nails.
Hermpac Starcap Grade 316 Stainless Steel fixings to NZBC E2/AS1 Table 24. Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes and colours.
Delete if specifying nail fixings.
Hermpac Jolt Head, Annular Grooved Grade 316 Stainless Steel fixings to NZBC E2/AS1 Table 24. Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
Delete if specifying a stain or oil finished weatherboard.
Hermpac Proprietary 40 x 2.0mm, 50 x 2.0mm and 27 x 2.0mm Clinch Nail, Annular Grooved Grade 316 Stainless Steel.
Used in addition to face fixings, clinch nails retain hidden lap tongues of rebated and shiplap weatherboard profiles. Must be used with rusticated and Multi-splay weatherboards in ‘Extra High’wind zones and above
To NZBC E2/AS1, 4.0 Flashings. Material, grade and colour as detailed and scheduled and to NZBC E2/AS1; Table 21: Compatibility of materials in contact and Table 22: Compatibility of materials subject to run-off. Ensure that materials used for flashings are compatible with the window frame materials and fixings and cladding materials and fixings.
To NZBC E2/AS1, 4.0 Flashings. Machine folded stainless steel/AM coated steel / aluminium sheet to profile of weatherboard and mitred corner joints. To NZBC E2/AS1; Table 21: Compatibility of materials in contact and Table 22: Compatibility of materials subject to run-off. Ensure that materials used for soakers are compatible with adjacent materials and fixings, cladding materials and fixings.
Check compatibility of soakers to site exposure elements, chosen timber and timber treatment. Etch primed Aluminium soakers (flat and corner soakers) are available for paint finished weatherboards.Modify as appropriate.
To NZBC E2/AS1, 4.0 Flashings. Machine folded half-hard copper sheet to profile of weatherboard and mitred corner joints. To NZBC E2/AS1; Table 21: Compatibility of materials in contact and table 22: Compatibility of materials subject to run-off. Ensure that materials used for Soakers are compatible with adjacent materials and fixings and cladding materials and fixings.
Check compatibility of soakers to site exposure elements, chosen timber and timber treatment. Etch primed Aluminium soakers (flat and corner soakers) are available for paint finished weatherboards. Modify as appropriate.
The following clauses relate to priming and/or pre-staining/oiling often being carried out by others before the painter arrives on site. Ensure that selections made are compatible with later paint/stain/oil systems.
Flood Coat Inundation: Factory application of selected oil based stain finishes by flood inundation and enhanced penetration of timber surface by roller pressure and fibre saturation.
Refer to: www.hermpac.co.nz/our-products/coatings
Wood X Oil: | Penetrating wood oil - exclusive Machinecoat (NZ) factory formulation, standard and custom colour range. |
Wood X Stain: | Penetrating stain - exclusive Machinecoat (NZ) factory formulation, standard and custom colour range. |
Resene: | Machinecoat (NZ) Waterborne Woodsman oil stain - exclusive pigment and fungicide enriched factory formulation |
Site applications to manufacturers specifications. All Hermpac weatherboards and mouldings must be coated all six sides prior to installation.
Refer to Machinecoat (NZ) Ltd for colours and coating types.
Delete sections not relevant to contract.
Factory spray application of premium primer and undercoat. Option also available for first finishing coat on to pre-primed and undercoated timber surface.
Refer to www.hermpac.co.nz/our-products/coatings
Primer: | Hermpac White or as specified by special contract. |
|
Undercoat: | Hermpac Off White or as specified by special contract. |
|
Factory applied Finishing: | Refer to SELECTIONS. |
|
Refer to Machinecoat (NZ) Ltd for colours and coating types.
Delete sections not relevant to contract.
This finishing option can be applied to Western Red Cedar, Yellow Cedar or DuraLarch™.
CedarOne Mantle, CedarLine Mantle and AshinDura™ are always supplied pre-finished.
All Hermpac weatherboard cladding systems will arrive on site with a minimum of one coat factory finish. Additional coat/s will be required to achieve the desired look. Ensure site coating applications are to coating manufacturers specifications. All Hermpac weatherboards and mouldings must be coated with a specified coating system on all bare surfaces and ends must be minimum double sealed prior to installation. Refer to SELECTIONS.
Note: Kanda weatherboards to be finished with a Wood-X clear oil only, providing the timber with initial protection and then allowing the timber to silver/weather to a light grey finish over time.
Refer to 1270 CONSTRUCTION for requirements relating to delivery, storage and handling of products.
Use this standard generic clause and if appropriate add additional special requirements.
Refer to 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 these standard generic clauses and if appropriate add additional special requirements.
Check work previously carried out and confirm it is of the required standard for this part of the work.
Before fixing commences ensure that the substrate conforms to NZS 3604, section 2, table 2.1, Timber framing tolerances, and the requirements of NZS 3604, section 6, Foundation and subfloor framing, and NZBC E2/AS1, 9.4 Timber weatherboards, governing support for timber board cladding and Hermpac Installation Specifications.
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.
Execution to NZBC E2/AS1: 3.0 Weathertightness risk factors, and 9.0 Wall claddings, 9.1.8 Drained cavities and 9.4 Timber weatherboards and in accordance with Hermpac Installation Specifications.
The BRANZ Good practice guide: Timber cladding is a comprehensive book providing guidance on a number of critical installation issues, particularly where the project is located in an exposed position.
If not pre-finished before delivery, prepare and coat all faces and edges with one coat of premium wood oil or oil stain to coating manufacturers specifications immediately on opening block stack. Once coated, open stack each board to dry (or penetrate) with back facing downwards ensuring faces remain well finished, untouched and unblemished during drying. Once the coating is dry (Resene Woodsman) or penetrated (Wood-X wood oil), stack the boards face to face and back to back in subsequent layers, so as not to damage the face and finish. Keep dry and undamaged.
Apply a second coat to the boards once they have been installed if using Wood-X or a second and third additional coat if using Resene Waterborne Woodsman. Coating timeframes for oils/stains will vary. Check timeframe requirements for the second or third coats with the coating manufacturer.
Delete this clause if specifying paint.
If not pre-primed and/or undercoated before delivery, prepare and coat all faces and edges with one coat of primer and then once dry-to-re-coat, apply one coat of a primer undercoat. Consult with the nominated paint manufacturer for specification on paint system for the timber specified. Open stack each board to dry with the back facing down, ensuring faces remain well finished, untouched and unblemished. Once dry, place boards in fillet stack, laid flat and true, until fixed. Keep dry and undamaged. Allow to re-coat if exposed for more than one month before the final coating is applied.
Delete this clause if specifying wood oil/oil stain finish.
Fit cavity battens over wall underlay vertically, centred over studs and nail tack in place at 600mm maximum centres.
Options include; 20mm deep x 45mm wide, 40mm deep x 45mm wide or 45mm deep x 40mm wide battens. Amend clause to delete batten/fixing options not used.
Note: where rigid wall underlay is used, fixing length must be increased by a minimum of the thickness of the rigid wall underlay.
Provide separation between H3.2 CCA treated timber and aluminium flashings. Amend clause if required.
Delete this clause if using another option or direct fixed.
Fit cavity battens over wall underlay vertically, centred over studs. Permanently fix battens using 304 stainless steel screws at 600mm maximum centres, with 25mm minimum fixing penetration into framing.
Options include; 40mm deep x 45mm wide or 45mm deep x 40mm wide battens. Amend clause to delete batten/fixing options not used.
Note: where rigid wall underlay is used, fixing length must be increased by a minimum of the thickness of the rigid wall underlay.
Hermpac cavity battens are H3.2 Micropro treated - no separation required between cavity battens and aluminium flashings. Provide separation between H3.2 CCA treated timber and aluminium flashings. Amend clause if required.
Delete this clause if using another option or direct fixed.
For structurally fixed battens to Blockwork, Steel Framing, Concrete or other substrates contact Hermpac for guidance.
Refer to Hermpac Cavity System Installation Specification. Seal the top of the cavity and install cavity closer/vermin-proofing at base of walls, open horizontal (or raking) junctions, over openings (windows, meters etc). Use cavity spacers where fixing is required between cavity battens.
Delete this clause if direct fixed.
Confirm that exterior wall openings have been prepared ready for the installation of all window and door frames and other penetrations through the cladding. Required preparatory work includes the following:
Hermpac Construction Drawings call for a compressible bond breaker closed cell PVC foam seal to NZBC E2/AS1 9.1.10.7.
Refer to the Window & Glass Association NZ (WGANZ) Window Installation Guide. This covers the WGANZ recommendations on the preparation of window/door openings, minimum clearances between rough openings and the window/door frame, dressing of the wall underlay into the prepared opening, application of flexible flashing tape to the sill and top corners of the opening, installation of window/door frames and flashings, sealing of the window/door frame into the opening to create a pressure equalisation cavity, installation of flashings and the maintenance of appropriate clearances between the frame and the surrounding construction.
Penetrations through drained cavities to NZBC E2/AS1: External moisture, 9.1.9 Penetrations and 9.1.10 Windows and doors.
Use a string line, laser or mechanical device to set out all fixing that will be visible in the finished work. Align accurately in straight lines. Refer to relevant Hermpac Installation Specification and Construction Drawings to establish correct angle of fixing and consistent, accurate placement relative to visible edge of board.
These fixing clauses are written for general work. Read BRANZ Good practice guide: 'Timber Cladding' and use them as a model for particular design and location requirements and the relevant Hermpac Installation Specification and Branz Appraisal before commencing installation. .
Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards. Double coat all cut ends before fixing. Provide one face fixing per weatherboard at each cavity batten over stud location. Pilot drill all fixings slightly smaller than gauge of fixing to ensure a snug fit and to minimise risk of moisture entry. Finish the heads of Hermpac Crown, Rose and Flat head nails or Hermpac Starcap screws flush onto and not into the board surface. Do not over drive the nail/screw head and crush the timber surface beneath and surrounding the nail/screw.
Depending on personal preference and the type of nail head chosen "flush" may not accurately describe the desired finish for fixings; particularly where there is a danger of bruising the board surface. Modify to suit the preferred method.
Delete if specifying paint finish. Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards. Double coat all cut ends before fixing. Provide one face fixing per weatherboard at each cavity batten over stud location. Pilot drill all fixings slightly smaller than gauge of fixing to ensure a snug fit and to minimise risk of moisture entry. When using stainless steel jolt head nails, punch all fixings and prime all raw, exposed timber surfaces. Using an appropriate primer and filler, fill all nail holes flush with board surface.
Delete this clause if specifying oil/stain finish.
Hermpac Western Red Cedar, Yellow Cedar, DuraLarch™ or AshinDura™ weatherboards fixed with Hermpac Crown, Rose and Flat Head nails or Hermpac Starcap screws and Kanda weatherboards fixed with Hermpac Starcap screws, are limited to use in NZS 3604 Wind Zones up to and including Extra High when studs are at maximum 600mm centres.
Hermpac Western Red Cedar weatherboards fixed with jolt head nails are limited to use in NZS 3604 Wind Zones up to and including Medium when studs are at maximum 600mm centres, and NZS 3604 Wind Zones up to and including Very High when studs are at maximum 400mm centres.
Hermpac Yellow Cedar, DuraLarch™ and AshinDura™ weatherboards fixed with jolt head nails are limited to use in NZS 3604 Wind Zones up to and including Extra High when studs are at maximum 600mm centres.
Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
Delete this clause if specifying oil/stain finish.
Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards. Single face fix weatherboards to every fixing point, clear of the adjacent lapped board. Fixing to be driven in with a slightly upward slope. Line fixings vertically across the boards. Pilot drill all fixings slightly smaller than gauge of fixing to ensure a snug fit and to minimise risk of moisture entry. Refer to Hermpac Construction Drawings for accurate weatherboard fixing information.
Using a Hermpac specialty clinch nail, restrain the top edge of the Rebated Bevel Back by driving the clinch nail positioned hard up against the edge but not into the Rebated Bevel Back weatherboard. Drive the clinch nail into the frame so that the clinch head settles flush into the weatherboard’s surface, prior to the next row of boards being fixed above (studs at maximum 600mm centres). The clinch nail head must not sit proud of the timber surface nor prevent the correct separation of each adjacent row of boards.
Refer to Hermpac Construction Drawings and Installation Specification for suitable face fixings (options include Hermpac Silicon Bronze nails or Grade 316 Stainless Steel nails or Starcap screws. Kanda weatherboards are fixed with Hermpac Starcap screws), correct placement of fixings, size, length and minimum penetration requirements, and for external and internal corner construction and fixing details.
Where wall surfaces are too high for a single board length, specify an appropriate flashing line and retain the requirement for "full length boards" in between flashing lines and/or wall openings.
Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards. Single face fix weatherboards to every fixing point, clear of the adjacent lapped board. Fixing to be driven in with a slightly upward slope. Line fixings vertically across the boards. Pilot drill all fixings slightly smaller than gauge of fixing to ensure a snug fit and to minimise risk of moisture entry. Refer to Hermpac Construction Drawings for accurate weatherboard fixing information.
Using a Hermpac specialty clinch nail, prior to the next row of Rusticated, Splaycut or Multi-Splay boards being fixed alongside (studs at maximum 600mm centres) and at a position hard up against but not into the hidden lap board edge at every fixing point, restrain the hidden lap tongue by driving the clinch nail into the frame so that the clinch head settles flush into the weatherboard's surface. The clinch nail head must not sit proud of the timber surface nor prevent the correct separation of each adjacent row of boards.
Refer to Hermpac Construction Drawings and Installation Specification for suitable face fixings (options include Hermpac Silicon Bronze nails or Grade 316 Stainless Steel nails or Starcap screws), correct placement of fixings, size, length and minimum penetration requirements, and for external and internal corner construction and fixing details.
Where wall surfaces are too high for a single board length, specify an appropriate flashing line and retain the requirement for "full length boards" in between flashing lines and/or wall openings
Install flashings, covers and soakers as detailed on the drawings and to NZBC E2/AS1.
If wall surface is too high for a single aluminium flashing length, Overlap by 75mm minimum.
Ensure the work is complete with all flashings, finishings and trim properly installed so the cladding system is completely weathertight.
Refer to 1270 CONSTRUCTION for completion requirements and if required commissioning requirements.
Use this standard generic clause and if appropriate add additional special requirements.
Substitutions are not permitted to the following, unless stated otherwise. Contact technical@hermpac.co.nz for assistance or more information.
Product: | Hermpac Western Red Cedar products |
Certification type: | PEFC |
Timber species: | Western Red Cedar (Thuja plicata) |
Origin: | British Columbia, Canada |
Claim: | 100% PEFC Origin |
PEFC is the primary third party certification system for Western Red Cedar. If FSC is required, please contact Hermpac.
Product: | Hermpac Yellow Cedar products |
Certification type: | PEFC |
Timber species: | Yellow Cedar (Chamaecyparis nootkatensis) |
Origin: | British Columbian coast, through to Alaska |
Claim: | 100% PEFC Origin |
PEFC is the primary third party certification system for Yellow Cedar. If FSC is required, please contact Hermpac.
Product: | Hermpac DuraLarch™ products |
Certification type: | FSC |
Timber species: | DuraLarch™ (Larix Sibirica) |
Origin: | Northern Europe |
Claim: | FSC Mix |
Product: | Hermpac AshinDura™ products |
Certification type: | PEFC |
Timber species: | AshinDura™ |
Origin: | British Columbia, Canada |
Claim: | 100% PEFC Origin |
PEFC is the primary third party certification system for AshinDura™. If FSC is required, please contact Hermpac.
Product: | Hermpac Kanda products |
Certification type: | FSC |
Timber species: | Kanda (Beilschemiedia ssp) |
Origin: | Central Africa |
Claim: | FSC Mix |
Location: | ~ |
Species: | ~ |
Grade: | ~ |
Profile Number/Series: | ~ |
Profile type: | ~ |
Cover dimensions: | ~mm |
Thickness: | ~mm |
Cavity Fixing System: | ~ |
Surface finish: | ~ |
Moisture content: | ≤18% at fixing |
Species: | Western Red Cedar |
| Yellow Cedar |
| DuraLarch™ (limited profiles - refer Hermpac for confirmation) |
| AshinDura™ (limited profiles - refer Hermpac for confirmation) |
| Kanda (only available in bevelback profile HP61) |
Grade: | HERMPAC Premium Clears No.1 (PC1), HERMPAC WRC PremSelect, Finger Joint (CedarOne), HERMPAC DuraLarch™ (EKF1), AshinDura™ (PC1, QS, PQ), and Kanda Select and Better |
Profile Number/Series: | Select Standard (HP) and Custom (CP) Profiles from website or Hermpac Profile Portfolio or specified nominated alternative custom profile - Series numbers SH1-6 or SH20-25. |
| Kanda Bevelback HP61 |
Profile type: | Bevelback, Rebated Bevel back, Rusticated, Splaycut or Multi-Splay. |
Cavity Fixing System: | None (Direct fix), or over drained cavity (20mm deep x 45mm wide, 40mm deep x 45mm wide or 45mm deep x 40mm wide battens). |
Surface finish options: | Band Sawn Face (BSF), DF (Dressed Face), SF (Sanded Face - on the Broad Flat Face). For oils and stains a bandsawn face finish is recommended. However if a dressed finish is preferred, Hermpac recommend specifying a Sanded face finish, (to gently raise timber fibres and allow better penetration of the coating). For paint finished weatherboards a dressed face finish is recommended and small pencil round is machined to seen edges of the profile for paint to adhere and ensure adequate micron build is achieved. |
Surace finish: | “Combed” (for CedarOne Evolve/CedarLine Evolve) |
Moisture content: | Refer to NZS 3602 Table 4. |
Available in CedarOne Evolve/CedarLine Evolve for oil/stain finish and regular CedarOne Mantle/CedarLine Mantle for paint finish
Location: | ~ |
Species: | HERMPAC Western Red Cedar |
Grade: | HERMPAC Premium Clears No.1 (PC1) |
External Corner Mould: | ~ |
Internal Corner Mould: | ~ |
Cover boards: | HP 201, HP202 |
Scriber: | HP11 - HP18 |
Surface finish: | Band Sawn Face (BSF) |
Moisture content: | ≤18% at fixing |
Alternative species: | Yellow Cedar, DuraLarch™, Kanda - limited profiles - refer Hermpac for confirmation. |
Grade: | Yellow Cedar (PC1), DuraLarch™ EKF1 – limited profiles |
Profile: | Select Standard (HP) and Custom (CP) Profiles from website or Hermpac Profile Portfolio or specified alternative custom profile (CP Profiles). |
Surface finish options: | DF (Dressed Face), SF (Sanded Face - on the Broad Flat Face) |
Moisture content: | Refer to NZS 3602 Table 4. |
External corner: | HP40, HP42, HP201, HP202, HP310, HP321, Corner Soakers |
Internal corner: | HP41, HP110, HP201, HP202, HP360, HP370, CP2828 |
Species: |
|
Grade: | ~ |
Profile standard / custom: | ~ |
Surface finish: | Band Sawn Face (BSF) |
Species: | Western Red Cedar, Yellow Cedar, DuraLarch™, Kanda - (limited profiles - refer Hermpac for confirmation). |
Grade: | HERMPAC Premium Clears No.1 (PC1), Yellow Cedar (PC1), DuraLarch™ (EKF1 or PC1). |
Profile Standard: | HP 69 (135mm x 18.5mm), HP 70 (180mm x 18.5mm.) |
| HP 71 (135mm x 28mm), HP 72 (180mm x 28mm). |
| HP 73 (230mm x 28mm). |
Profile Custom: | Custom profiles from website, - some considerations apply. |
Surface finish: | DF (Dressed Face), SF (Sanded Face - on the Broad Flat Face). |
Moisture content: | Refer to NZS 3602 Table 4. |
Nails: | Crown Head |
Type: | Grade 316 stainless steel |
Size: | ~ |
Nail type options: | Rose Head, Flat Head |
Refer to Hermpac construction drawings for size and location of fixing.
Delete if using Silicon Bronze nails.
Nails: | Crown Head |
Type: | Silicon Bronze |
Size: | ~ |
Nail type options: | Rose Head, Flat Head |
Refer to Hermpac construction drawings for size and location of fixing.
Delete if using stainless steel nails.
Screws: | Hermpac Starcap |
Type: | Grade 316 Stainless Steel |
Colour: | ~ |
Size: | ~ |
Colour: | Traditional Stainless |
| Bronzed |
| Black |
| Grey |
Alternative colours are available on request.
Refer to Hermpac construction drawings for size and location of fixing.
Screw fixing for Kanda weatherboards.
Delete if using nails.
Nails: | Jolt Head |
Type: | Grade 316 stainless steel |
Size: | ~ |
Refer to Hermpac construction drawings for size and location of fixing.
Jolt head nails are not to be used when a stain/oil finish to weatherboards is specified. Delete if not required.
Nails: | Clinch nails |
Type: | Grade 316 stainless steel |
Size: | ~mm x 2.0mm |
Size: | 40mm, 50mm or 27mm. |
Refer to Hermpac construction drawings for size and location of fixing.
Recommended for all Rusticated and Multi-Splay installations. Mandatory for installations in Éxtra High’ wind zones and above.
Timber species: | Radiata Pine - merchant grade |
Treatment: | ~ |
Batten size: | ~ |
Fixings: | ~ |
Treatment: | H3.1 |
| H3.2 (Provide separation between H3.2 CCA treated timber and aluminium flashings) |
Batten size: | Fixings: |
20mm deep x 45mm wide | 40mm x 2.5mm flat head hot-dipped galvanized nails |
| 50mm x 2.8mm flat head hot-dipped galvanized nails or stainless steel finishing brads |
| 60mm x 2.8mm flat head hot-dipped galvanized nails or stainless steel finishing brads |
40mm deep x 45mm wide | 60mm x 2.8mm flat head hot-dipped galvanized nails or stainless steel finishing brads |
45mm deep x 40mm wide | 60mm x 2.8mm flat head hot-dipped galvanized nails or stainless steel finishing brads |
Delete if using direct fixing method or structurally fixed battens.
Timber species: | Radiata Pine - square dressed |
Treatment: | H3.2 Micropro treated |
Batten size: | ~ |
Fixings: | ~ |
Note: Provide separation between H3.2 CCA treated timber and aluminium flashings.
Hermpac cavity battens H3.2 are Micropro treated - no separation required between cavity battens and aluminium flashings.
Batten size: | Fixings: |
40mm deep x 45mm wide | 12g x 65mm Grade 304 Stainless steel Hex drive screws |
45mm deep x 40mm wide | 12g x 75mm Grade 304 Stainless steel Hex drive screws |
Delete if using direct fixing method or non structurally fixed options.
Brand/type: | Sigma cavity closure |
Material: | Aluminium |
Options: | PVC or Stainless steel |
Delete if using direct fixing method.
Material: | Aluminium |
Size: | ~ |
Length: | 2.4 or 3.0m lengths |
Type: | Unhemmed |
Size options: | 75 x 75mm, 100 x 100mm, 140 x 140mm, To suit specified corners, refer to Hermpac construction drawings for size requirements. |
Type option: | Hemmed - as per NZBC E2/AS1. Note hemmed flashings are required in Extra High Wind Zone. |
Location: | External corners / board ends |
Material: | ~ |
Finish: | ~ |
Material selection: | Copper, Stainless steel or Colorsteel on AM coated steel. Etch primed aluminium corner and joint soakers available for use with paint finished weatherboards. |
| For Bevel Back, Rebated Bevel Back, Splaycut and Multi-Splay weatherboards only. |
Brand: | Machinecoat (NZ) Ltd |
|
Product: | Wood-X penetrating wood oil |
|
Coating process: | Machinecoat (NZ) Ltd. Flood Coat Inundation |
|
Colour: | ~ |
|
Factory coats: | One |
|
On site coats: | One, or as per coating manufacturers specification |
|
Option: | Wood X pentrating stain |
| Resene Waterborne Woodsman Oil Stain |
Factory coat: | One coat for Wood-X, one or two coats for Resene Waterborne Woodsman Oil Stain. |
Brand: | Machinecoat (NZ) Ltd |
|
Product: | Dulux |
|
Coating process: | Machinecoat (NZ) Ltd. Spray Application |
|
Primer: | HERMPAC White |
|
Undercoat: | HERMPAC Off White |
|
Top coat product and colour: | ~ |
|
Product: | Dulux, Resene |
Top coat colour: | ~ |
First top coat can be factory applied. Second and subsequent top coats (as required by paint manufacturer) are applied on site after installation. Delete or amend as required.
Note: Resene Cool Colour paint system primer & undercoat must be used when Resene Cool Colour top coats are used.
Brand: | Wood-X penetrating wood oil |
|
Colour: | ~ |
|
On site manual coats: | Refer Manufacturers specifications |
|
Option: | Wood X penetrating stain |
| Resene Woodsman Oil Stain |
Brand/type: | Refer to painting sections |
Can be factory applied, via Machinecoat NZ Ltd, check with Hermpac
Ensure the correct paint system is chosen for the timber specified.
Note: Resene Cool Colour paint system primer & undercoat must be used when Resene Cool Colour top coats are used.
Brand: | ~ |
Type: | ~ |
Primer: | ~ |
Undercoat: | ~ |
Topcoat colour: | ~ |
First finish/top coat can be factory applied, via Machinecoat NZ Ltd, check with Hermpac
Ensure the correct paint system is chosen for the timber specified.
Note: Resene Cool Colour paint system primer & undercoat must be used when Resene Cool Colour top coats are used.