• Cavity or Direct Fix

H-Clad KiwiTEC Shiplap Vertical are suitable as a vertical external fixed wall cladding, meet the requirements and limitations of the following:

• NZBC Acceptable System — E2/AS1, Paragraph 1.1
• Timber framing compliant with NZS 3604:2011
• Risk score of 0-20 calculated from NZBC Acceptable Solution E2/AS1, Table 2; and,
• NZS 3604:2011, Sec5.2 Wind Zones, including 'Very High'
• All materials and processes contained in the NZS 3604:2011 building scope 

All HTL H-Clad Weatherboards meet the requirements of the NZ Building Code for Clauses B1 Structure, B2 Durability and E2 Exterior Moisture when installed in accordance with the HTL installation guide.

H-Clad KiwiTEC Vertical Shiplap must be designed and installed in accordance with the HTL Vertical Shiplap Technical Guide for Specifiers and Installers.

H-Clad KiwiTEC is manufactured with care and inspected to ensure quality. However, it is a natural wood product and subject to variations in weight, density, colour, grain and performance. Care must be taken in installation and maintenance to allow for movement.

Storage and Handling

Care must be taken to ensure that timber and accessories are kept clean and dry, and are not damaged whilst in storage awaiting application. Extra care is to be taken while handling timber to ensure that they are not damaged. Timber is to be stacked on flat level bearers that are a maximum of 900mm apart and at least 100mm off the ground.

Timber should either be stored inside an enclosed building or covered and protected from the elements when stored outside

Important: Timber weatherboards should not be installed if their moisture content is outside the range of 14 - 18 %

Coating Requirements

It is not recommended that HTL weatherboards be left uncoated.

HTL recommends that all timber H-clad cladding should be envelope coated before installation, including all cut ends and exposed fresh timber. Avoid coating the top surface only, once installed as this will likely cause movement (cupping) in the timber surface.

HTL do not recommend the use of dark paints or coatings as this may accentuate movement and splitting of the timber, especially if it is exposed to the sun or hot temperatures.  Timber generally requires a coating with a Light Reflective Value (LRV) of 40% or greater to minimise the amount of heat build-up in the timber and the resultant thermal movement.  (NB: Black ≈ 5% & White ≈ 95%)

Dryden WoodOil Note:

• For fire rating — Two coats of Dryden WoodOil coated on 18.5mm Western Red Cedar as Group 3 (NZBC) Test Report 7-599140-CO
• Light Reflective Values (LRV) — LRV cannot be determined for semi-transparent coatings, as the colour of the timber coated and the number of coats applied impacts measured LRV.

When designed, installed and maintained in strict accordance with the HTL Vertical Shiplap Technical Guide for Specifiers and Installers, the H-Clad KiwiTEC Vertical Weatherboard Drained Cavity System complies with the following clauses of the New Zealand Building Code for cladding in residential and light commercial buildings within the scope of NZS 3604. 

• Clause B1 — Structure: Meets the requirements for loads arising from self weight, wind and impact.
• Clause B2 — Durability: Meets requirements for Performance B2 3.1 (b) ,15 years and B2.3.2.
• Clause E2 — External Moisture: Performance E.3.2.

The H-Clad KiwiTEC Vertical Weatherboard Drained Cavity System is an Alternative Solution and has been tested in an appropriately certified test facility and has shown to meet the requirements of E2/VM1 using the details and materials prescribed in the Technical Guide.

HTL NZ Macrocarpa Weatherboards are manufactured from New Zealand Macrocarpa (hesperocyparis macrocarpa since October 2013 (previously cupressus macrocarpa)) and comply with NZS 3602:2003; Table 2:2A1-Species. Weatherboards are supplied in Dressing Heart Grade (NZS 3602:2003; Table 2:2A1-Grade) which comprises of Heartwood with sound tight knot

HTL H-Clad KiwiTEC Vertical Shiplap Weatherboards are supplied dry, moisture content at 18% or less (see NZS 3602:2003, Table 2:2A1-Moisture).