BGC Duragroove™ and Durascape™ Facade Systems (Cavity)

The BGC Duragroove™ and Durascape™ Facade Systems (Cavity) are cavity-based, shiplap-jointed wall cladding systems. They are designed to be used as an external wall cladding systems for residential and light commercial type buildings where domestic construction techniques are used.

The BGC Duragroove™ and Durascape™ Cavity Facade Systems (Cavity) consist of Duragroove™ or Durascape™ fibre-cement sheets fixed with mechanical fasteners and adhesive sealant over timber battens to form a cavity. The fibre-cement sheet is finished with a paint system.

The systems incorporate a primary and secondary means of weather resistance (first and second line of defence) against water penetration by separating the cladding from the external wall framing with a nominal 20 mm cavity.

BGC Duragroove™ and Durascape™ Facade Systems (Cavity) have been appraised as external wall cladding systems for buildings within the following scope:

• The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1.
• Constructed with timber framing complying with the NZBC.
• With a risk score of 0-20 calculated in accordance with NZBC Acceptable Solution E2/AS1 Table 2.
• Situated in NZS 3604 wind zones up to and including extra high.

BGC Duragroove™ and Durascape™ Facade Systems (Cavity) have also been appraised for weathertightness and structural wind loading when used as external wall cladding systems for buildings within the following scope:

• The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1 with regards to building height and floor plan area.
• Constructed with timber framing complying with the NZBC.
• Situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS) of 2.5 kPa.

BGC Duragroove™ and Durascape™ Facade Systems (Cavity) must only be installed on vertical surfaces (except for tops of sills and balustrades, which must have a minimum slope as defined by NZBC E2/AS1 or NZBC F4/AS1 and be waterproofed in accordance with the technical literature).

BGC Duragroove™ and Durascape™ Facade Systems (Cavity) are appraised for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills. (The Appraisal of BGC Duragroove™ and Durascape™ Facade Systems (Cavity) relies on the joinery meeting the requirements of NZS 4211 for the relevant wind zone or design wind pressures.)

• Duragroove Facade System Brochure, September 2017
• Architectural details, BGC Duragroove D00-D28, November 2011

Always refer to the Appraisal in full and the technical literature.