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JSC Vertical Shiplap Timber Weatherboard Cladding

JSC are recognised as leaders in timber cladding and cavity system development in New Zealand, offering an extensive range of carefully selected quality products, profiles, and colour coatings to suit every design need.

The JSC Vertical Shiplap Weatherboard Cladding System is known as JSC VertiClad and this cladding system comprises:

  • Timber weatherboards
  • Cavity battens
  • Flashings
  • Fixings
  • Coatings
  • Mouldings & Accessories

JSC Timber weatherboards come in a variety of profiles, species, and finishes. JSC weatherboards are offered in:

  • Western Red Cedar — Up to 250mm wide | 18.5mm – 39mm thick | Random & select length spread | BSF, DF & Brushed finishes available
  • Alaskan Yellow Cedar — Up to 150mm wide | 18.5mm & 22mm thick | Random length spread | BSF & Brushed finishes available
  • Radiata Pine — Up to 200mm wide | 20mm thick | Random length spread | BSF, DF & Brushed finishes available
  • TMT Taiga LW (Lunawood)* — Up to 200mm wide | 18.5mm thick | Random length spread | BSF & Brushed finishes available
  • TMT Taiga TW* — Up to 200mm wide | 18.5mm thick | Random length spread | BSF & Brushed finishes available

*Increasing environmental awareness and demand for sustainable, natural and chemical-free building products initiated JSC's research into thermal timber treatment methods, recognising that Thermally Modified Timber opens up a truly sustainable resource. The JSC TMT® product range offers a selection of Thermally Modified Timbers that have been specifically sourced for the New Zealand market based on their versatility, durability, aesthetic properties, and environmental credentials to suit the New Zealand weather conditions.

Key Features

Key benefits of using the JSC VertiClad Weatherboard Cladding Systems:

  • Fully tested and CodeMark certified external wall cladding system
  • Random width and depth design options for VertiClad systems
  • Can be custom designed to your specifications including solutions for curved walls
  • Extensive product range
  • In-house factory coating system

JSC Weatherboard Profiles 

JSC's in-house, state-of-the-art machining and highly skilled machinists can provide bespoke and customised solutions for any architectural project. JSC can:  

  • Machine and design custom weatherboard profiles to align with any unique design requirement
  • Machine and design custom profiles to suit curved walls
  • Match existing profiles for renovation projects 
NZ-Owned Business
NZ-Owned Business
Scope of Use

JSC installation and specification guide and CodeMark certificate guidelines must be followed.

JSC VertiClad — Vertical Shiplap Weatherboard Cladding System – CodeMark Certificate: CM-GM30084


  • In wind zones up to and including extra high, as defined in NZS3604:2011 or situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS)of 2.5 kPa, where the building has been specifically engineered
  • In all exposure zones, excluding microclimates as defined in NZS3604:2011.


  • Has the scope limitations of NZBC Acceptable Solution E2/AS1, Third Edition including amendment 9 (27/06/2019), Paragraph 1.1; and,
  • New timber framed buildings with building wrap or rigid air barrier that comply with the NZBC Acceptable Solution E2/AS1 Third Edition including amendment 9 (27/06/2019),
  • Existing timber framed buildings where the designer and installer have satisfied themselves that the existing building is suitable for the intended building work
  • With a risk score of 0-20 when calculated in accordance with NZBC Acceptable Solution E2/AS1, Third Edition including amendment 9 (27/06/2019), Table 2
  • The System must only be installed vertically on vertical, flat, surfaces
  • The System is certified for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills
  • The wall cladding system is located more than 1m from a relevant boundary.

Note: See CodeMark Certificate for full and up to date information. Please refer to installation instructions and maintenance guide available for download under Documents. 

Limitations on Use

JSC weatherboard cladding must be used as an external cladding system within the scope and limitations of JSC Cladding Systems technical literature. All weatherboard and timber components must be installed, maintained, and finished as per the JSC specification.

It is the specifier's responsibility to ensure that the details in this specification are appropriate for the intended application. Additional details must be obtained for areas that fall outside the scope of the JSC VertiClad weatherboard cladding system technical literature and CodeMark certificate.

For the fixing of JSC TMT thermally modified timber weatherboards, only Stainless Steel fastenings must be used.

JSC Cladding systems must be installed by a suitably qualified and experienced trade person. Where Restricted Building Work (RBW) is applied the installer must be a Licensed Building Practitioner (LBP) or supervised by an LBP.

Statement of Building Code Compliance

The JSC Weatherboard Systems if designed and installed as per the JSC VertiClad installation and specifications guide, will meet the following provisions of the New Zealand Building Code (NZBC):

  • Clause B1 Structure: Performance B1.3.1, B1.3.2, B1.3.4 (a), (b), (c), (d) and (e) for the relevant physical conditions of B1.3.3 (a), (e), (f), (h), (j), and (q)
  • Clause B2 Durability: Performance B2.3.1(b) and B2.3.2(b)
  • Clause E2 External Moisture: Performance E2.3.2, E2.3.3, E2.3.5, E2.3.7(b) and (c)
  • Clause F2 Hazardous Building Materials: Performance F2.3.1

JSC Western Red Cedar Weatherboard System, if installed and maintained as per manufacturer’s documentation, will meet the minimum 15-year durability requirement in respect of clauses B1 and B2 of the first schedule of the New Zealand Building Code for external cladding. In a typical installation, it is likely to have a serviceable life exceeding 30 years.

Other Performance Attributes
  • All suitable timber product offerings will eventually weather to shades of grey when subjected to the environmental elements of temperature, moisture, and UV rays. Therefore, to help maintain the fresh, new colour, the use of a premium grade oil stain with a UV protectant is recommended, with a factory-applied envelope coat as the first step to a long and beautiful life.
  • All JSC Timber weatherboards are finished with high-quality exterior grade coating options.
  • JSC weatherboards are available in a range of timber product offerings and profiled to JSC specifications, consistent with NZS 3617 and BRANZ BU411.
  • H3.2 treated timber castellated cavity battens are used
  • Quality Flashings and accessories are used
B1 Structure compliant
B2 Durability compliant
E2 External Moisture compliant
External Moisture
F2 Hazardous Building Materials compliant
Hazardous Building Materials
JSC VertiClad System 20mm Cavity over Flexible underlay Technical Drawings


JSC VertiClad System 20mm Cavity over Rigid underlay Technical Drawings
JSC VertiClad System 45mm Cavity over Flexible underlay Technical Drawings
JSC VertiClad System 45mm Cavity over Rigid underlay Technical Drawings
JSC VertiClad CodeMark Certificate 30084


JSC Exterior Timber Weatherboard Cladding Maintenance Guide


JSC VertiClad Specification and Installation Guide


JSC VertiClad Installation Checklist
JSC Profile Chart


JSC TMT Profile Chart


Alaskan Yellow Cedar Information Sheet
JSC TMT Taiga Information
JSC TMT Taxon Information Sheet
Radiata Pine Information Sheet
Verticlad by JSC
Western Red Cedar Information Sheet

JSC Timber is a trusted and reliable manufacturer and supplier of premium interior and exterior hardwood and exotic softwood timber products and materials.

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