Description

The Craftstone Real Stone Veneer System is a cavity-based external wall cladding system for residential and light commercial type buildings where domestic construction techniques are used.

The system consists of a natural stone veneer using pre-chosen and prepared elements of natural quarried stone. The stone is bonded to fibre cement backing sheets which are fixed over timber battens to form a 20 mm cavity. The stone veneer and mortar are mechanically anchored through to the structural wall framing by stainless steel anchor ties and screws.

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 drained cavity.  The first line of defence is the sealant coated fibre cement (and associated tapes and flashings), the second being the 20 mm drained cavity separating the cladding from the wall framing. 

Scope

The Craftstone Real Stone Veneer System has been appraised as an external wall cladding system 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 Craftstone Real Stone Veneer System has also been appraised for weathertightness and structural wind loading when used as an external wall cladding for buildings within the following scope:

• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to floor area and building height; and,
• constructed with timber framing 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.

The Craftstone Real Stone Veneer System must only be installed on vertical surfaces (except for sills which must have a minimum 10° slope and be waterproofed in accordance with the Technical Literature).

The 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 Craftstone Real Stone Veneer System relies on the joinery meeting the requirements of NZS 4211 for the relevant Wind Zone or design wind pressure.)

Installation of components and accessories (excluding battens, fibre-cement board and screws) supplied by Petros Holdings Ltd and approved installers must be carried out only by installers approved by Petros Holdings Ltd.