Description

The PXR Residential Cavity Rail System is an express jointed, cavity-based cladding system that incorporates an aluminium rail support system to achieve a 20 mm cavity depth. The cavity is drained and vented at every horizontal junction/joint. It is designed to be used as an external cladding system for residential and light commercial type buildings.

The PXR Residential Cavity Rail System features fibre cement panels referred to as Swisspearl and Shera Board, or wood fibre laminate panels referred to as Parklex. Panels are fastened to aluminium rail supports with either an adhesive fixing system, or a combination of adhesive fixing and mechanical fasteners, dependent on the installation height above ground level.

The cavity 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 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.

Scope

Timber Framing

The PXR Residential Cavity Rail System has been appraised as external wall cladding for timber-framed buildings within the following scope:

• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 for timber-framed buildings; 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’
• with a building height of ≤ 10 m and at a distance of ≥ 1 m to the relevant boundary.

Steel Framing

The PXR Residential Cavity Rail System has been appraised for use as an external wall cladding for steel-framed buildings within the following scope:

• the scope limitations of NASH Building Envelope Solutions Paragraph 1.1 for steel-framed buildings; and,
• with a risk score of 0-20, calculated in accordance with NASH Building Envelope Solutions; and,
• situated in NASH Standard Part 2 Wind Zones up to, and including ‘Extra High’; and
• with a building height of ≤ 10 m and at a distance of ≥ 1 m to the relevant boundary.

Specific Design

The PXR Residential Cavity Rail System has also been appraised for use as an external wall cladding for buildings within the following scope:

• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 for timber-framed buildings or NASH Building Envelope Solutions, Paragraph 1.1 for steel-framed buildings with regard to building height and floor plan area; and,
• constructed with framing or infill framing subject to specific design complying with the NZBC; and,
• situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS) of 2.5 kPa.

General

1. The PXR Residential Cavity Rail System must only be installed on flat, vertical surfaces.

2. The PXR Residential Cavity Rail System is appraised for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills. (Note: The Appraisal of the PXR Residential Cavity Rail System relies on the joinery meeting the requirements of NZS 4211 for the relevant Wind Zone.)

3. Building designers are responsible for the incorporation of the PXR Residential Cavity Rail System into their design in accordance with the instructions of CLAD Solutions Limited, using the details given in the Technical Literature, and for designing all details not covered by this Appraisal.