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:

Refer to the general section 1233 REFERENCED DOCUMENTS.  The following documents are specifically referred to in this section:

Hermpac Construction Drawings:

Hermpac Bevelback & Rebated Bevelback Weatherboard Cavity System Installation Specifications

Hermpac Bevelback & Rebated Bevelback Weatherboard Direct Fix System Installation Specifications

Quality Assurance Checklist - Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System

Hermpac Rusticated, Splaycut & Multi-Splay Weatherboard Cavity System Installation Specifications

Hermpac Rusticated, Splaycut & Multi-Splay Weatherboard Direct Fix System Installation Specifications

Quality Assurance Checklist - Hermpac Rusticated, Splaycut & Multi-Splay Weatherboard Cavity System

Hermpac Standard and Custom Profiles

Hermpac Profile Portfolio

Hermpac Grade descriptions

Hermpac Nail fixings

Hermpac Legal and / or Sustainable Certification

Hermpac Product Technical Statement

Machinecoat - Flood Coat Inundation versus Spray Application

Maintenance of selected Wood Oil / Oil Based Stain finishes

BRANZ Appraisal 524 - Cavity Batten System

BRANZ Appraisal 658 - Hermpac Rusticated, Splaycut and Multi-Splay Weatherboard Cavity System

BRANZ Appraisal 663 - Hermpac Bevelback and Rebated Bevelback Weatherboard Cavity System

CodeMark Certificate of Conformity for Hermpac Rusticated, Splaycut and Multi-Splay Weatherboard Cavity System Certificate Number GM-CM30037-RevG

CodeMark Certificate of Conformity for Hermpac Bevelback & Rebated Bevelback Weatherboard Cavity System Certificate Number GM-CM30038-RevG

Cavity System Certificate Number GM-CM30036-RevG

Hermpac Limited - FSC Licence No FSC-C102539, Certificate Code SGS-COC-008082, expires 30 Nov 2019

PEFC Forestry Sustainable Certification - contact Hermpac Limited

Manufacturer/supplier contact details

Requirements

Abbreviations and definitions:

FSC 100%

• FSC-certified material originating in FSC-certified forests or plantations that has not been mixed with material from another category throughout the supply chain.FSC 100% products can be used in FSC Mix product group.

FSC Mix % or FSC Mix Credit

• A mixture of the following - FSC 100%, FSC recycled timber, FSC Controlled Wood - and supplied with a percentage claim or Credit claim.

FSC Controlled Wood

• Forest of origin risk-assessed against FSC Controlled Wood standards and deemed low risk of being:illegally logged, violating traditional/civil/conservation rights, change of use or GM planting.All non-FSC certified timber plantations in NZ have been assessed and deemed low risk by FSC.

FSC Forest Management (FM) Certification

• A forest management unit independently FSC inspected and certified that it complies with the internationally-agreed FSC Principles.

FSC Chain of Custody (COC) Certification

• COC certification applies to those who process, transform or trade forest products, providing a guarantee about the production and source of FSC-certified products and tracking the production and distribution of the products.

Organisation website details:

Forest Stewardship Council website:- https://nz.fsc.org/en-nz

Hermpac Limited - FSC Licence No FSC-C102539, Certificate Code SGS-COC-008082, expires 30 Nov 2019

PEFC Forestry Sustainable Certification - contact Hermpac Limited

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 SELECTIONS for details of amount, type, suppliers.

Certified responsibly sourced FSC-COC Certified timber from forest to installation.Contractor to obtain timber supplier's FSC-COC certificate, delivery notes and/or invoices showing FSC-COC code and FSC Claim identified against product item(s).Also include signed FSC outsourcing agreements between parties (eg FSC timber broker and non-FSC door joiner) if applicable.

Hermpac Limited - FSC Licence No FSC-C102539, Certificate Code SGS-COC-008082, expires 30 Nov 2019

PEFC Forestry Sustainable Certification - contact Hermpac Limited

Hermpac Canadian Coastal Western Red Cedar (Thuja plicata) harvested from the sustainable managed forests of British Columbia, Canada.  Hermpac Western Red Cedar is supplied from forest sources, certified legal and sustainable under one or more independent third party verified certification systems (PEFC, CSA, SFI or FSC).

Hermpac DuraLarch™ (Larix Sibirica) harvested from the sustainable managed forests of Northern Europe.  Hermpac DuraLarch™ is supplied from forest sources, certified legal and sustainable under one or more independent third party verified certification systems (FSC).

Hermpac Single Species Ashin-Dura™ is harvested from the sustainable managed forests of British Columbia, Canada.  Hermpac Ashin-Dura™ is supplied with Quarter Sawn grain orientation, from forest sources certified legal and sustainable under one or more independent third party verified certification systems (PEFC, CSA, SFI or FSC).  Ashin-Dura™ is specific to Hermpac.

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:

• Horizontal Standard Bevel Back and Hermpac Custom Profiles
• Horizontal Standard Rebated Bevel Back and Hermpac Custom Profiles
• Horizontal Standard Rusticated and Hermpac Custom Profiles
• Horizontal Standard Splaycut, Multi-Splay and Hermpac Custom Profiles

A selection of the above profiles are also available in Western Red Cedar Finger-Joint (CEDARONE) and Ashin-Dura™, 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.

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.

For flexible wall underlays, rigid wall underlays and rigid air barriers, refer to the appropriate separate section(s).

Radiata Pine H3.1 or H3.2 minimum 20mm thickness, width and height to match timber framing studs.  Temporary fix battens before being fixed into the framing with the cladding fixings.  Treatment to NZBC B2/AS1 and NZS 3602, table 1, reference 1D.10, Requirements for wood-based building components to achieve a 50-year durability performance.

Radiata Pine H3.1 or H3.2 battens, minimum 20mm thickness, width and height to match timber framing studs.  Structurally fix Radiata Pine cavity battens to BRANZ BU 582, part 4.2.  To NZS 3602, table 1, reference 1D.10, Requirements for wood-based building components to achieve a 50-year durability performance.

Cavibat extruded fluted polypropylene cavity batten system.  Refer to BRANZ Appraisal 524.

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.

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.

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.

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.

Hermpac Proprietary 40 x 2.0mm, 50 x 2.0mm and 27 x 2.0mm Clinch Nail, Annular Grooved Grade 316 Stainless Steel.

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/zinc coated steel 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.

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.

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

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

Coating applications to manufacturers specifications.  All Hermpac weatherboards and mouldings must be coated with a specified coating system on all six sides prior to installation.  Refer to SELECTIONS.

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.

Take delivery of Hermpac timber products, dry, unmarked and undamaged from freight and handling (Grade characteristics excluded).  Stack Hermpac weatherboards flat and true, clear of the ground by a minimum of 150mm and supported on dry, clean timber bearers at maximum 900mm centres.  Keep weatherboards dry at all times, either by storing within an enclosed building, or when stored externally place an additional secondary cover on the plastic wrapping.  Care must be taken to avoid damage to weatherboard edges and surfaces.

Before starting fixing ensure that the substrate conforms with 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.

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 the block stack is opened.  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.  Re-coat the boards once they have been installed.

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.

Install 20mm minimum thickness drained cavity to NZBC E2/AS1: 9.0 Wall claddings, where required.  The Radiata Pine battens are temporarily fixed over the wall underlay using galvanized nails and then firmly fixed by the cladding fixings which will penetrate the wall framing studs.

Install 20mm minimum thickness drained cavity to NZBC E2/AS1: 9.0 Wall claddings, where required.  The Radiata Pine battens are permanently fixed using grade 304 Hermpac stainless steel Hex head screws ensuring minimum 25mm penetration into framing or as per BRANZ BU582 Structurally fixed cavity battens.

Install Cavibat 18mm drained cavity.  Wall framing studs lined with Cavibat battens vertically and horizontally.  The Cavibat battens are temporarily fixed over the wall underlay using galvanized nails and then firmly fixed by the cladding fixings which will penetrate the wall framing studs.

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.

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.

Use a string line, laser or mechanical device to set out all nailing that will be visible in the finished work.  Align all nailing accurately in straight lines.  Refer to relevant Hermpac Installation Specification and Construction Drawings to establish correct angle of nail and consistent, accurate placement relative to visible edge of board.

Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards.  Double coat all cut ends before fixing.  Pilot drill all fixings slightly smaller than gauge of fixing to ensure a snug fit and to minimize risk of moisture entry.  Finish the heads of Hermpac Crown, Rose and Flat head nails flush onto and not into the board surface.  Do not over drive the nail head and crush the timber surface beneath and surrounding the nail.

Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards.  Double coat all cut ends before fixing.  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.

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 DuraLarch™ and Ashin-Dura™ 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.

When using Hermpac Crown, Rose or Flathead nails, flush fix heads onto and not into the board surface.  Do not over drive the nail head and crush the timber surface beneath and surrounding the nail.

Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards.  Single nail weatherboards to every fixing point, just clear of the adjacent lapped board.  Nails to be driven in with a slightly upward slope.  Line nails 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 external and internal corner construction and fixing details.

Install level, true to line and face, to NZBC E2/AS1: 9.4 Timber weatherboards.  Single nail weatherboards to every fixing point, just clear of the adjacent lapped board.  Nails to be driven in with a slightly upward slope.  Line nails 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 website 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 external and internal corner construction and fixing details.

Install flashings, covers and soakers as detailed on the drawings and to NZBC E2/AS1.

Ensure the work is complete with all flashings, finishings and trim properly installed so the cladding system is completely weathertight.

Replace all damaged or marked elements.

Leave work to the standard required for following procedures.

Remove all debris, unused materials and elements from the site.

The following timber from sourced to installed to be FSC COC Certified.

Delivery notes and/or invoices must clearly show the FSC-COC Certificate Code of the company supplying the product, and the FSC Claim against the relevant product  description: eg FSC 100%, FSC Mix, FSC Mix Credit or FSC Recycled.

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