Description

Oblique^TM Weatherboard Cladding is a cavity-based fibre cement weatherboard wall cladding system.

Oblique^TMWeatherboard Cladding consists of ObliqueTM Weatherboard, which is a 14mm profile fibre cement weatherboard, fixed horizontally or vertically over battens to form a nominal 20 mm cavity.

Proprietary ventilated timber battens are used in the vertical application. The cladding is finished with a latex paint system.

The cladding system incorporates a primary and secondary means of weather resistance (first and second lines of defence) against water penetration by separating the cladding from the external wall framing with a nominal 20 mm cavity. The cavity allows for any occasional ingress of water that may get past the external skin to drain to the exterior of the building, and any remaining moisture to dry by evaporation.

The system is designed to be used as part of an external cladding system on timber framed building.

Scope

1. The system is certified:

• a. as a cavity fixed external wall cladding for buildings:
  
  • i. within the scope limitations of the NZBC Acceptable Solution E2/AS1, 3rd Edition, amendment 10, 5 November 2020, Paragraph 1.1,
  • ii. with a risk score of up to 20, calculated in accordance with the NZBC Acceptable Solution E2/AS1, 3rd Edition, amendment 10, 5 November 2020, Table 2,
  • iii. situated in in NZS 3604:2011 Wind Zones up to, and including Extra High, and
• b. as a cavity fixed external wall cladding for buildings specifically engineering designed (SED):
  
  • i. up to 25m in height, and
  • ii. with an inter-storey drift of span/180 maximum, and
  • iii. the design ultimate limit state (ULS)differential wind pressure does not exceed 3.2 kPa; and
  • iv. with the stud and batten spacing no more than 600mm centres,
• c. located:
  
  • i. in all exposure zones (except microclimates) as defined in NZS3604:2011 section 4.2, and
  • ii. anywhere in relation to the relevant boundary for Importance Levels 1 to 4 buildings within the scope of:
    
    • C/AS1, Second edition, 2 November 2023 paragraph 1.1.1 or
    • C/AS2, amendment 3, 2 November 2023 paragraph 1.1.1.

2. The system shall be specified, installed, inspected and maintained in accordance with the following sets of documents collectively referenced as the Applicable Technical Specification to the extent that their scope covers that for this Certificate:

• a. For the Horizontal applications:
  • i. ObliqueTM Weatherboard 14mm Horizontal Installation – Technical specification, June 2024;
  • ii. Fire & Acoustic Design Manual (September 2024) by James Hardie section 4:16 Control of External Fire Spread, figures No’s. 2 to 11, 14 to 18 and 21 to 26, specifically details JHETGO30h and JHETGO60h. These details have only been assessed and certified with respect to external fire spread via ObliqueTM Weatherboard Cladding. For walls located within 1.0 m of a relevant boundary, ObliqueTM Weatherboard Cladding may be used as an external façade/cladding attached to the exterior of fire rated wall systems as depicted within the Fire and Acoustic Design Manual (September 2024). Fire Resistance rating performance of the wall assembly falls outside the scope of this certificate;
• b. For the Vertical Application:
  • i. ObliqueTM Weatherboard 14mm Vertical Installation – Technical specification, June 2024;
  • ii. Fire & Acoustic Design Manual (September 2024) by James Hardie section 4:16 Control of External Fire Spread, figures No’s. 2 to 11, 14 to 18 and 21 to 26, specifically details JHETGO30v and JHETGO60v. These details have only been assessed and certified with respect to external fire spread via ObliqueTM Weatherboard Cladding. For walls located within 1.0 m of a relevant boundary, ObliqueTM Weatherboard Cladding may be used as an external façade/cladding attached to the exterior of fire rated wall systems as depicted within the Fire and Acoustic Design Manual (September 2024). Fire Resistance rating performance of the wall assembly falls outside the scope of this certificate.

(Note: Provisions within the documents above related to the use of the system with steel-frame construction are outside the scope of this certification).

3. In wind zones greater than Very High a rigid air barrier which complies with Table 23 of E2/AS1 3rd Edition, amendment 10, 5 November 2020 shall be used. In buildings exceeding 10 m in height RABTM Board must be used including horizontal control joints in accordance with the requirements of the Codemark certificate for RABTM Board. (Refer to GM-CM30130).

4. The system is certified for use:

• a. with the ancillary components as described in this certificate, and
• b. with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills. Only joinery compliant with the requirements of NZS 4211:2008 including amendment 1 for the relevant Wind Zone or wind pressure shall be used.

5. ObliqueTM Weatherboard Cladding shall only be installed on vertical surfaces.

6. All exposed faces, including top edges at sills and all bottom edges of ObliqueTM Weatherboard Cladding Weatherboards and fibre cement ancillary components shall be finished with a latex exterior paint system complying with any of Parts 7, 8, 9, or 10 of AS 3730.

7. E2.3.5 and E2.3.6 compliance is limited to cavities created between the internal surface of the weatherboards and the underlay or RABTM Board’s.