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 Vertical cladding:
- Vertical Shiplap weatherboards
- Board and Batten weatherboards
- Fascia
- Mouldings
- Proprietary flashing systems
- Vertical Shiplap 'Vertibat' cavity batten systems
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 painting sections for finishes to weatherboard cladding.
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 4221HH Hermpac Horizontal Weatherboard Cladding System
Refer to 4221HB Hermpac Accoya® 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 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 E2/AS1 | External moisture |
Timber and wood-based products for use in building | |
Timber-framed buildings | |
Profiles of weatherboards, fascia boards and flooring |
JAS-ANZ CodeMark Certification CMNZ30036 - Hermpac VertiLine Vertical Shiplap 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 B2/AS1 | Durability |
NZBC C/AS1 | Protection from fire |
NZBC C/AS2 | Protection from fire |
Guide to Window Installation as described in E2/AS1 | |
BRANZ BU 411 | Recommended Timber Cladding Profiles |
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 publication | Selecting wall claddings |
BRANZ Good practice guide - Timber cladding
Hermpac VertiLine Vertical Shiplap Weatherboard Cavity System installation Specifications
Hermpac Vertical Shiplap Weatherboard Direct Fix System Installation Specifications
Hermpac Product Technical Statement (PTS) – VertiLine Vertical Shiplap Weatherboard Cavity System (July 2023)
Hermpac Product Installation Checklist – VertiLine Vertical Shiplap Weatherboard Cavity System (Jan 2023 V2)
Hermpac Board and Batten Weatherboard Cavity System Installation Specifications
Hermpac Board and Batten Weatherboard Direct Fix System Installation Specifications
Hermpac Product Technical Statement (PTS) – Board and Batten Weatherboard Cavity System (July 2023)
Hermpac Product Installation Checklist – Board and Batten Weatherboard Cavity System (Jan 2023 V2)
Hermpac Standard and Custom profiles
Hermpac Profile Portfolio
Hermpac Nail/Screw fixings
Hermpac Legal and / or Sustainable Certification
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
BRANZ Appraisal 650 - Hermpac VertiLine Vertical Shiplap Weatherboard Cavity System
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 vertical weatherboard cladding systems |
- Provide this warranty on the installer/applicator standard form (if not available then 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 installer/applicator requirements, options include:
- Modify the form to be used
- Commence the warranty from the date of installation (check with the installer/applicator)
Refer to 1270 CONSTRUCTION for requirements relating to qualifications.
Hermpac vertical weatherboard cladding systems meet the requirements of the NZBC when used within the Conditions and Limitations of their Certificate CMNZ30036.
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 vertical 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: -
- Producer Statement - Construction from the applicator / installer
- Other information required by the BCA in the Building Consent Approval documents.
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 have 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 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 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 or FSC). PEFC is the primary third party certification system for AshinDura™. If FSC is required, please contact Hermpac.
NB; To meet the provisions of the New 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.
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 relevant 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:
- Vertical Standard Shiplap and Hermpac Custom Profiles
- Vertical Standard Board and Batten and Hermpac Custom Profiles
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).
Vertibat Western Red Cedar 18mm deep x 45mm wide castellated and double bevelled cavity battens.
Hermpac Vertibat cavity battens must be used for system compliance, no substitutions. Use cavity battens where required by NZBC E2 /AS1 table 3. V8/V9 WRC contains no treatment.
Delete this clause if specifying other Vertibat option.
Vertibat Radiata Pine, H3.1 and H3.2 treated castellated and double bevelled cavity battens, available in a range of sizes. Refer to SELECTIONS.
Hermpac Vertibat cavity battens must be used for system compliance, no substitutions. Use cavity battens where required by NZBC E2 /AS1 table 3. Vertibat Radiata Pine batten - Treatment to NZBC B2/AS1 and NZS 3602, Table 1, reference 1D.10. Note: Hermpac Vertibat H3.2 is MicroPro® treated and compatible with Hermpac aluminium back flashings.
Batten sizes: V1 (20mm deep x 45mm high), V2 (20mm deep x 70mm high), V3 (40mm deep x 45mm high), V4 (40mm deep x 70mm high), V5 (45mm deep x 45mm high) and V6 (45mm deep x 70mm high).
Delete this clause if specifying other Vertibat option.
Vertibat Radiata Pine, H3.2 treated castellated and double bevelled cavity battens, available in a range of sizes. Refer to SELECTIONS.
Hermpac Vertibat cavity battens must be used for system compliance, no substitutions. Use cavity battens where required by NZBC E2 /AS1 table 3. Vertibat Radiata Pine batten - Treatment to NZBC B2/AS1 and NZS 3602, Table 1, reference 1D.10. Note: Hermpac Vertibat H3.2 is MicroPro® treated and compatible with Hermpac aluminium back flashings.
For structurally fixed battens to Blockwork, Steel Framing, Concrete or other substrates contact Hermpac for guidance.
Batten sizes: V3 (40mm deep x 45mm high), V4 (40mm deep x 70mm high), V5 (45mm deep x 45mm high) and V6 (45mm deep x 70mm high).
Delete this clause when specifying non structurally fixed cavity battens.
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 21. 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 vertical shiplap weatherboard profiles. Must be used in ‘Extra High’ wind zones and above. Can also be used with Board and Batten profiles.
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.
Note: Flashings in contact with CCA treated timber require separation / bond break such as DPC. Hermpac cavity battens are not CCA treated.
Polyurethane or silane terminated polymers (PU-hybrid technology) construction sealant.
Sikaflex 11FC, Sikaflex 123 MS Bond or Gorilla MS Sealant are suitable options. For a complete list refer to the Hermpac Installation Specifications.
The following clauses relate to priming and/or pre-staining/oiling which is often 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 clause if 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 clause if 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.
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.
Application in accordance with Hermpac Installation Specifications.
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 finish.
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 premium 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.
Note: CedarOne/CedarLine Mantle weatherboards are supplied pre-primed & undercoated.
Install 18mm minimum thickness drained cavity. Fit Vertibat V8/V9 WRC cavity battens horizontally over wall underlay to wall framing, centred over nogs at 400mm - 480mm vertical centres with top edge sloping away from wall underlay and nail tack in place.
Delete this clause if using other Vertibat option.
Install 20mm minimum thickness drained cavity. Fit Vertibat cavity battens horizontally over wall underlay to wall framing, centred over nogs at 400mm - 480mm vertical centres with top edge sloping away from wall underlay and nail tack in place.
Delete this clause if using other Vertibat option.
Install 40mm minimum thickness drained cavity. Fit Vertibat cavity battens horizontally over wall underlay to wall framing at 400mm - 480mm vertical centres with top edge sloping away from wall underlay. Permanently fix battens to studs using 304 stainless steel screws at 600mm maximum centres, with 25mm minimum fixing penetration into framing.
Note: Nogs are not required behind Vertibat structurally fixed cavity battens. For structurally fixed battens to Blockwork, Steel Framing, Concrete or other substrates contact Hermpac for guidance.
Delete this clause when specifying non structurally fixed Vertibat cavity battens.
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:
- wall underlay to openings finished and dressed off ready for the installation of window and door frames and other penetrations
- claddings neatly finished off to all sides of openings
- installation of flashings (those required to be installed prior to installation of penetrating elements).
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. For vertical shiplap boards, where possible the exposed lap should face away from the prevailing wind.
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 Vertibat cavity batten over nogging or structurally fixed cavity batten 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.
Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
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.
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 Vertibat cavity batten over nogging or structurally fixed cavity batten 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.
Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
Delete this clause if specifying oil/stain finish.
Hermpac Western Red Cedar, Yellow Cedar, DuraLarch™ or AshinDura™ weatherboards fixed with Stainless Steel or Silicon Bronze 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 dwangs or structurally fixed Vertibat cavity battens are at maximum 480mm centres.
Hermpac Western Red Cedar weatherboards fixed with stainless steel jolt head nails are limited to use in NZS 3604 Wind Zones up to and including Medium when dwangs or structurally fixed Vertibat cavity battens are at maximum 480mm centres, and NZS 3604 Wind Zones up to and including Very High when dwangs or structurally fixed Vertibat cavity battens 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 dwangs or structurally fixed Vertibat cavity battens are at maximum 480mm centres.
Refer to Hermpac Construction Drawings for fixing details and to SELECTIONS for fixing sizes.
Crown, Rose and Flat Head nails MUST be used for all oil/stain finished weatherboard applications. Delete clause if specifying jolt head nails with paint finished weatherboard.
Jolt head nails are generally used for paint finished weatherboard applications. Delete 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 horizontally 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 Vertical Shiplap boards being fixed alongside (nogs or dwangs at maximum 480mm 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 cavity batten 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. Do not pin laps or weatherboard faces.
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 must be 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. Face fix in the centre of the board width (nogs or dwangs at minimum 400 centres to maximum 480mm centres). Fixing to be driven in with a slightly upward slope. Line fixings horizontally 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.
Using a Hermpac 50 x 2.0mm speciality clinch nail, restrain both hidden board edges by driving the clinch nail positioned hard up against the board edge but not into the board. Drive the clinch nail into the cavity batten so that the clinch head settles flush into the board surface, prior to the weatherboard batten being fixed over top (nogs or dwangs at maximum 480mm centres).
Do not pin boards or battens.
Space boards with a 6-8mm gap for correct alignment of battens over each board beneath. Face fix the centre of the batten with a single fixing through the gap between boards at every fixing point. Fixing to be driven in with a slightly upward slope. Line fixings horizontally across the battens and boards.
NB: One fixing in the centre of each board and one fixing in the centre of each batten at each fixing point.
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 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.
Coated weatherboards laid over Mill Finish Grade 316 Stainless Steel:
Sika: Wipe weatherboard surfaces with a clean rag. Using an abrasive pad, rub down Stainless Steel in a single pass before cleaning with Sika Aktivator-205. Coat both weatherboards and Stainless Steel with Sika Primer 3N and apply a continuous 5mm bead of Sikaflex-11FC or Sikaflex 123 MS Bond.
Soudal: Wipe weatherboard surfaces with a clean rag before wiping Stainless Steel only with Gorilla 696 Surface Activator, being careful not to coat any powder coated surfaces. Apply a minimum 5mm thick continuous bead of Gorilla MS Sealant.
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: | |
Timber species: | Western Red Cedar (Thuja plicata) |
Origin: | British Columbia, Canada |
Claim: | 100% PEFC Origin |
Product: | Hermpac Yellow Cedar products |
Certification type: | |
Timber species: | Yellow Cedar (Chamaecyparis nootkatensis) |
Origin: | British Columbian coast, through to Alaska |
Claim: | 100% PEFC Origin |
Product: | Hermpac AshinDura™ products |
Certification type: | |
Timber species: | AshinDura™ |
Origin: | British Columbia, Canada |
Claim: | 100% PEFC Origin |
Location: | ~ |
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Species: | ~ |
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Grade: | HERMPAC Premium Clears No.1 (PC1) |
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Profile Number/Series: | ~ |
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Profile type: | Vertical Shiplap |
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Cover dimensions: | ~mm |
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Thickness: | ~mm |
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Cavity Fixing system: | ~ |
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Surface finish: | Band Sawn Face (BSF) |
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Moisture content: | ≤18 % at fixing |
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Species: | Western Red Cedar, Yellow Cedar, DuraLarch™ and AshinDura™ (limited profiles - refer Hermpac for confirmation). Kanda (CP3096, CP3196). |
Grade options: | HERMPAC WRC Prem Select, Finger Joint (CedarOne), HERMPAC DuraLarch™ (EKF1), and AshinDura™ (PC1, QS PQ). |
Profile Number/Series options: | Select Standard (HP) and Custom (CP) Profiles from website or Hermpac Profile Portfolio or specified nominated alternative custom profile - Series numbers SV1-6 or SV20-25. |
Cavity Fixing systems: | None (Direct fix), or over drained cavity (18mm, 20mm, 40mm, 45mm). |
Surface finish options: | 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 a small pencil round is machined to top edges of the profile for paint to adhere and ensure adequate micron build is achieved. |
Surface finish: | “Combed” (for CedarOne Evove/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: | ~ |
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Species: | ~ |
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Grade: | HERMPAC Premium Clears No.1 (PC1) |
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Profile Number/Series: | ~ |
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Profile type: | Board and Batten |
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Fixing system: | ~ |
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Board dimensions: | ~mm x ~mm |
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Batten dimensions: | ~mm x ~mm |
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Cavity fixing system: | ~ |
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Surface finish: | Band Sawn Face (BSF) |
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Moisture content: | ≤18% at fixing |
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External corner battens: | HP201 and HP202 |
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Internal corner battens: | HP201 and HP202 |
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Species: | Western Red Cedar, Yellow Cedar, DuraLarch™ and AshinDura™ (limited profiles - refer Hermpac for confirmation). Kanda (BB18 - 65mm x 22mm batten CP4252, 135mm x 22mm board CP4251 only). |
Grade: | HERMPAC WRC Prem Select, Finger Joint (CedarOne), HERMPAC DuraLarch™ (EKF1) and AshinDura™ (PC1, QS PQ). |
Profile Number/Series options: | Select Standard (HP) and Custom Profiles (CP) from website or Hermpac Profile Portfolio or specifed nominated alternative custom profile. Series numbers BB10-16. |
Cavity Fixing systems: | None, (Direct fix), or |
| over drained cavity (18mm, 20mm, 40mm, 45mm). |
Surface finish options: | 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 a small pencil round is machined to top edges of the profile for paint to adhere and ensure adequate micron build is achieved.. |
Surface 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: | ~ |
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Species: | ~ |
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Grade: | HERMPAC Premium Clears No.1 (PC1) |
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External Corner Mould: | ~ |
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Internal Corner Mould: | ~ |
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Cover boards: | HP 201 and HP 202 |
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Scriber: | HP11 - HP18 |
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Surface finish: | Band Sawn Face (BSF) |
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Moisture content: | ≤18% at fixing |
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Alternative species: | Western Red Cedar, Yellow Cedar, DuraLarch™, Kanda (limited profiles - refer Hermpac for confirmation). |
Grade: | Yellow Cedar (PC1), HERMPAC DuraLarch™ (EKF1) – limited profiles. |
Profile options: | Select Standard (HP) and Custom (CP) Profiles from website or Hermpac Profile Portfolio or specified nominated 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 mould options: | HP40, HP42, HP201, HP202, HP300, HP301, HP310, HP321, HP330, HP399 |
Internal corner mould options: | HP41, HP110, HP201, HP202, HP350, HP351, HP352, HP360, HP370, CP2828, HP399 |
Species: | ~ |
Grade: | HERMPAC Premium Clears No.1 (PC1) |
Profile: | ~ |
Surface finish: | Band Sawn Face (BSF). |
Species: | Western Red Cedar, Yellow Cedar, DuraLarch™ (limited profiles - refer Hermpac for confirmation). |
Grade: | Yellow Cedar (PC1), HERMPAC DuraLarch (EKF1) – limited profiles. |
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 options: | DF (Dressed Face), SF (Sanded Face - on the Broad Flat Face). |
Moisture content: | Refer to NZS 3602 Table 4. |
Nails: | ~ |
Type: | Grade 316 stainless steel |
Size:~ |
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Nails: | Crown Head, Rose Head, Flat Head. |
Refer to Hermpac literature for size and location of fixing.
Delete if using Silicon Bronze nails.
Nails: | Crown Head |
Type: | Silicon Bronze |
Size:~ |
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Nail type options: | Rose Head, Flat Head. |
Refer to Hermpac literature 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 literature for size and location of fixing
Screw fixing for Kanda weatherboards.
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 options include 40mm, 50mm and 27mm.
Refer to Hermpac construction drawings for size and location of fixing.
Used in addition to face fixings, clinch nails retain hidden lap tongues of vertical shiplap weatherboard profiles. Recommended for all Vertical Shiplap weatherboard Installations. Mandatory for Vertical Shiplap weatherboard installations in Éxtra High’ wind zones and above.
Product: | Vertibat V8/V9 WRC |
Timber species: | Western Red Cedar (FJ) |
Size: | 45mm wide x 18mm thick x 2700mm long |
Fixings: | ~ |
Note:Hermpac Vertibat cavity battens must be used for system compliance, no substitutions.
Fixings: | 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 |
Delete if using direct fixing method or structurally fixed options.
Product: | Vertibat (V1) |
Material: | ~ |
Size: | 45mm wide x 20mm thick x 2700mm long |
Fixings: | Flat head nails |
Fixing size: | 40mm x 2.0mm |
Note: Hermpac Vertibat cavity battens must be used for system compliance, no substitutions.
Product option: | Vertibat (V2) 70mm wide x 20mm thick. Vertibat (V3) 45mm wide x 40mm thick). Vertibat (V4) 70mm wide x 40mm thick. Vertibat (V5) 45mm wide x 45mm thick. or Vertibat (V6) 70mm wide x 45mm thick. |
Material: | H3.1 LOSP Radiata Pine |
| H3.2 Micropro Radiata Pine |
Nail size option: | 40mm x 2.5mm, 50mm x 2.8mm, 60mm x 2.8mm. |
Fixing option: | Finishing Brads |
Delete if using direct fixing method or structurally fixed options.
Product: | Vertibat (V3) |
Material: | H3.2 Radiata Pine |
Size: | 45mm wide x 40mm thick x 2700mm long |
Fixing: | Grade 304 Stainless Steel Hex drive screws |
Fixing size: | ~ |
Product: | Vertibat (V5), 45mm wide x 45mm thick. (V2), 70mm wide x 40mm thick. |
| (V4), 70mm wide x 45mm thick (V6). |
Fixing size: | 12 gauge x 65mm long (for 40mm x 45mm battens), 12 gauge x 75mm long (for 45mm x 45mm battens). Ensure minimum embedment into studs is achieved. |
Delete if using direct fix 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: | ~ |
Type: | Unhemmed |
Size options: | To suit specified corners, refer to Hermpac construction drawings. |
Length options: | 2.4m or 3.0m length |
Type options: | Hemmed - as per NZBC E2/AS1. Note hemmed flashings are required in Extra High Wind Zone. |
Primer: | ~ |
Sealant: | ~ |
Primers; SikaPrimer 3N, Sika Aktivator-205, Gorilla 696 Surface Activator,
Sealants; Sikaflex 11FC, Sikaflex 123 MS Bond, Gorilla MS Sealant, Gorilla Grip 1 Hour
Brand: | Machinecoat (NZ) Ltd |
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Product: | Wood-X penetrating wood oil |
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Coating process: | Machinecoat (NZ) Ltd. Flood Coat Inundation |
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Colour: | ~ |
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Factory coats: | One |
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On site coats: | One, or as per coating manufacturers specification |
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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 |
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Product: | Dulux |
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Coating process: | Machinecoat (NZ) Ltd. Spray Application |
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Primer: | HERMPAC White |
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Undercoat: | HERMPAC Off White |
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Top coat product and colour: | ~ |
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Product: | Dulux, Resene |
Top coat colour: | Refer Manufacturers specifications |
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 |
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Colour: | ~ |
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On site manual coats: | Refer Manufacturers specifications |
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Option: | Wood X penetrating stain |
| Resene Woodsman Oil Stain |
Brand: | Refer to painting sections |
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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: | ~ |
Brand: | Dulux, Resene |
Type: | Refer Manufacturers specifications |
Primer, undercoat & topcoat | Refer Manufacturers specifications |
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.