PRIMAflex™ Cavity Wall Cladding System
- Appraisal number 635
- Valid from
- Information provider
- BRANZ Limited
- Information type
- BRANZ Appraisal
The PRIMAflex™ Cavity Wall Cladding System is a cavity-based monolithic sheet wall cladding. It is designed to be used as an external wall cladding system for residential and light commercial type buildings where domestic construction techniques are used.
The PRIMAflex™ Cavity Wall Cladding System consists of PRIMAflex™ sheet, which is a fibre cement sheet product, fixed over timber battens to form the cavity. The cladding joints are finished with purpose-made jointers or timber battens and the system is finished with a latex paint system.
The cladding incorporates 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.
The PRIMAflex™ Cavity Wall Cladding System has been appraised as an external wall cladding for buildings within the following scope:
- the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1; and,
- constructed with timber framing complying with the NZBC; and,
- with a risk score of 0-20, calculated in accordance with NZBC Acceptable Solution E2/AS1, Table 2; and,
- situated in NZS 3604 Wind Zones up to, and including 'Extra High'.
The PRIMAflex™ Cavity Wall Cladding System must only be installed on vertical, flat surfaces (except for tops of balustrades and parapets, which must have a minimum 5° slope and be waterproofed in accordance with the Technical Literature).
The PRIMAflex™ Cavity Wall Cladding System is appraised for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills. (The Appraisal of the PRIMAflex™ Cavity Wall Cladding System relies on the joinery meeting the requirements of NZS 4211 for the relevant Wind Zone, or wind pressure.)