Description

The BGC Stratum™ Vertical Cavity Cladding System is a cavity-based, shiplap-jointed wall cladding 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 BGC Stratum­™ Vertical Cavity Cladding System consists of Stratum™ fibre cement planks fixed over castellated timber battens to form a ventilated cavity.  The fibre cement planks are finished with a paint system. 

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 20mm cavity.

Scope

The BGC Stratum™ Vertical Cavity Cladding 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,
• 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 BGC Stratum™ Vertical Cavity Cladding System has also been appraised for weathertightness and structural wind loading when used as a wall cladding system 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; and,
• constructed with timber framing subject to specific engineering design; and,
• situated in specific design wind pressures up to a maximum design differential ultimate limit state (ULS) of 2.5 kPa.

The BGC Stratum™ Vertical Cavity Cladding System must only be installed vertically on vertical surfaces.

The BGC Stratum™ Vertical Cavity Cladding System has been appraised for use with aluminium window and door joinery that is installed with vertical jambs and horizontal heads and sills. (The Appraisal of the BGC Stratum™ Vertical Cavity Cladding System will rely on the joinery meeting the requirements of NZS 4211 for the relevant Wind Zone or wind pressure.)

NOTE: BGC Stratum™ Vertical Planks can be used to provide fire resistance rated construction, but this aspect has not been assessed by this Appraisal and is outside its scope.