BGC Stratum™ Vertical Cavity Cladding System

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 20 mm cavity.

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.
• 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 BGC Stratum™ Vertical Cavity Cladding System has also been appraised for weathertightness and structural wind loading when used as an external wall cladding system for buildings within the following scope:

• The scope limitations of NZBC Acceptable Solution E2/AS1 paragraph 1.1 with regard to building height and floor plan area.
• Constructed with timber framing subject to specific engineering design.
• 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.

Stratum, Stratum Duo, Stratum Trio - Horizontal and Vertical Installation Stratum Contour, September 2019

Architectural details

• SV-01 Foundation Detail May 2019
• SV-02 Typical Plank Joint Detail May 2019
• SV-03 Internal Corner Detail May 2019
• SV-04 External Corner Detail May 2019
• SV-05 Window Head May 2019
• SV-06 Window Jamb Detail May 2019
• SV-07 Window Sill Detail May 2019
• SV-08 Soffit Detail May 2019
• SV-09 Inter-Storey Drainage Detail May 2019
• SV-10 Plank Joint Detail (Longitudinal) May 2019
• SV-11 Enclosed Deck Detail Cavity Construction May 2019
• SV-12 Window Head/Jamb Junction Detail Cavity Construction May 2019
• SV-13 Window Sill/Jamb Junction Detail May 2019
• SV-14 Soffit Detail Cavity Construction May 2019
• SV-15 Eaves With No Soffit Detail Cavity Construction May 2019
• SV-16 Meter Box Head Detail Cavity Construction May 2019
• SV-17 Meter Box Jamb Detail May 2019
• SV-18 Meter Box Sill Detail May 2019
• SV-19 Enclosed Balustrade - Wall Junction 3D Cavity Construction May 2019
• SV-20 Enclosed Balustrade/Parapet Detail Cavity Construction May 2019
• SV-21 Enclosed Balustrade - Wall Junction Detail Construction May 2019
• SV-22 Gutter to Wall Junction Cavity Construction May 2019
• SV-23 Parallel Apron Flashing Detail Cavity Construction May 2019
• SV-24 Transverse Apron Flashing Detail Cavity Construction May 2019
• SV-25 Pipe Penetration Detail Cavity Construction May 2019
• SV-GA1 Batten Layout - Elevation May 2019
• SV-GA2 Plank Layout - Elevation May 2019

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