CertClad | Bevelback Cavity System | Radiata Pine | Installation Manual
© ITI Timspec Ltd | BC-RP-IM-V5 | CertClad is a registered Trademark of ITI Timspec Ltd
Last Updated March 2021
9
MATERIALS -
CAVITY SYSTEM COMPONENTS
5.1
CAVITY SYSTEM COMPONENTS
All cavity system components must be supplied by, or approved by ITI Timspec. This is to ensure that all
items are up to a suitable standard and to ensure the compatibility and suitability of all items. Any
alternative or competitor supplied product will invalidate the Certclad Warranty.
5.2 TIMBER SPECIES: RADIATA PINE
5.2.1 MATERIAL
New Zealand grown Radiata Pine (Pinus Radiata) which has been preservative treated to a minimum H3.1
(ACQ, CCA, etc.) level.
5.2.2 DURABILITY
ITI Timspec Radiata Pine is warranted for between 15
– 40 years depending on coating selected.
The above Warranty assumes regular maintenance. Please refer to the On
–Going Maintenance Section
12 for more information.
Please note, some timber boards may require replacement over the lifetime of the cladding as part of
normal maintenance.
5.2.3 COATING
Dark colours attract more heat which will exacerbate any timber movement and/or resin bleed. Therefore
only coatings which have an LRV (light reflectance value) of 45% or higher can be used. Any coating that
has an LRV less than 45% will void the warranty.
5.2.4 IMPORTANT NOTES
Timber treated with a copper-based treatment (ACQ, CCA, etc.) should not be in contact with metal wall
claddings as this may lead to corrosion. Separation is required in the form of an approved DPC.
Material selection to be in accordance with NZBC Clause E2/AS1 Table 21 compatibility of materials in
contact and Table 22.
5.3
RADIATA PINE BEVELBACK WEATHERBOARDS
Radiata Pine can be machined into a variety of profiles, including the range of Bevelback weatherboards as
listed on our Website.
5.3.1 COATING DRESSED AND/OR TREATED WEATHERBOARDS
H3.1 or H3.2 treated painted finish Radiata Pine must have a dressed surface and must be coated with two
coats of primer and two further coats of a suitable alkyd or 100 percent acrylic paint. All relevant sections of
standard AS/NZS 2311 (Guide to the painting of buildings) should be adhered to.
All cut ends must be coated with a minimum of one coat of primer before installation. Immediately after
fixing the weatherboards, all nail holes should be spot-primed and filled, and sanded smooth prior to
painting.
