Description

The CertClad Weatherboard Cladding System is exterior wall cladding on a nominal 20 mm drained cavity.

The CertClad Weatherboard Cladding System consists of weatherboards fixed to cavity battens forming a nominal 20 mm drained cavity.

Weatherboard with Bevelback, Rusticated and Vertical Shiplap profiles are manufactured from the following materials and with the following finishes:

• Accoya® Wood Weatherboards (supplied coated or uncoated)
• Radiata Pine, H3.1 and H3.2 Weatherboards (supplied pre-primed)
• Western Red Cedar Weatherboards (supplied coated or uncoated)
• Thermally Modified Radiata Pine Weatherboards (supplied coated or pre-primed)

Other system components include:

• Cavity battens
• Nails
• Flashings
• Moulding profiles

Scope

1. The CertClad Weatherboard Cladding System is certified for timber-framed buildings:

• a. with walls designed
  • i. in accordance with NZS3604:2011 Timber-framed buildings, as modified by Acceptable Solution B1/AS1 Amendment 20 and within the scope of Acceptable Solution E2/AS1, 3rd Edition including amendment 10 (5/11/2020) Paragraph 1.1, or of at least equivalent stiffness to the framing provisions of NZS3604:2011, and situated in Wind Zones (as defined in NZS 3604:2011) up to and including Extra High; or
  • ii. in accordance with Verification MethodB1/VM1 Amendment 20 up to a maximum design differential ultimate limit state (ULS) wind pressure of 2.5 kPa, and
• b. up to 10 m in height, and
• c. with a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1, 3rd Edition including amendment 10, 5 Nov 2020 Table 2, and
• d. situated:
  • i. in all exposure zones (excluding microclimates) as defined in NZS3604:2011, Paragraph 4.2.4, and
  • ii. more than 1m from a relevant boundary.

2. The CertClad Weatherboard Cladding System shall be installed and maintained according to the applicable Installation Manual (see documents).

3. The CertClad Weatherboard Cladding System shall:

• a. be fixed over a flexible building underlay or rigid air barrier in accordance with Acceptable Solution E2/AS1 and the applicable Installation manual, and
• b. incorporate a nominal 20 mm drained cavity formed by H3.2 radiata battens for weatherboards installed horizontally (Bevelback and Rusticated) castellated H3.2 radiata battens or polypropylene ventilated cavity battens for weatherboards fixed vertically (Vertical Shiplap), and
• c. be installed on vertical, flat surfaces.

4. Nails for fixing the weatherboards shall be either Stainless Steel (316) for all materials, or Silicon Bronze for Western Red Cedar, or Stainless Steel (304) for Radiata pine.

5. All joinery used in conjunction with the CertClad Weatherboard Cladding System shall

• a. meet the requirements of NZS 4211:2008 including Amendment 1 for the relevant Wind Zone or wind pressure, and
• b. be installed with vertical jambs and horizontal heads and sills.