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Appraisal number: 550 (2019)

Date issued: 15 Oct 2019

Nu-Wall Aluminium Cladding Cavity System

Description

The Nu-Wall Aluminium Cladding Cavity System is a cavity-based, interlocking powder-coated aluminium weatherboard system. 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 system includes horizontally fixed Nu-Wall weatherboards, cavity battens, internal and external corner mouldings, starter strip, board jointers, board locators, soffit caps, joinery flashings and accessories.

The system 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.

Scope

The Nu-Wall Aluminium Cladding Cavity 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.
  • 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.

The Nu-Wall Aluminium Weatherboard Cladding Cavity System has also been appraised for weathertightness and structural wind loading when used as an external horizontally fixed wall cladding system for buildings within the following scope:

  • The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1.
  • Constructed with timber and steel 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.

The Nu-Wall Aluminium Cladding Cavity System must only be installed horizontally on vertical, flat surfaces. The tops of parapets and balustrades must have a minimum 5° slope and be waterproofed with metal cap flashings in accordance with the technical literature.

The Nu-Wall Aluminium Cladding Cavity 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 Nu-Wall Aluminium Cladding Cavity System relies on the joinery meeting the requirements of NZS 4211 for the relevant wind zone or wind pressure.)

Technical literature

Nu-Wall Aluminium Cladding - Installation Reference (horizontal on cavity), Issue 11 (03/2012)

Nu-Wall Extruded Aluminium Cladding Installation Specifications - Horizontal orientation (over cavity), March 2012, for the following weatherboard profiles: 

  • Classique
  • Shiplap
  • Ripple 150, Ripple 190, Ripple 200
  • Aero 70, Aero 115, Aero 190, Aero 200
  • Louvre 60, Louvre 120, Louvre 150
  • Mono100, Mono190, Mono200
  • E100, E200, E70/130
  • Ullos
  • AliClad

Consenting instructions

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

Appraisal holder

Aluminium Product Brands NZ Ltd
Address:
Phone: 0800 689 255

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