Building wind zones up to and including Extra High.

Recommended for standing seam or low profile roof cladding applications in skillion roof type constructions or any application where extra ventilation is required.

It is recommended for use as a self supporting roof underlay (R2) on roof pitches greater than 3º.

Suitable for the following roof applications:

• Direct fixing on all roof cladding types including concrete and clay tiles, profiled metal and pressed metal tiles
• Roofs using plywood or other rigid air barrier type solid substrate under the cladding

To meet the requirements of NZBC, DuPont Tyvek Metal must be:

• Installed as per the datasheet
• Installed on roof pitches greater than 3º

DuPont Tyvek Metal should not be:

• Installed horizontally on purlin spacings of greater than 1350mm to allow for 150mm laps
• Used as a vapour barrier

The use of DuPont Tyvek Metal is considered an alternative solution complying with NZBC Clause E2.

DuPont Tyvek Metal, when installed in accordance with the recommended guidelines will meet or contribute to meet the following provisions of NZBC:

• NZBC Clause B2: Durability. Meets the requirement of NZBC B2/AS1 Table 1 (Building Wraps/Roof Underlay).
• NZBC Clause E2: External Moisture. Contributes to meet these requirements for use as a roof underlay and air barrier.
• NZBC Clause F2: Hazardous Building Materials. Meets this requirement and will not present a health hazard to people according to F2.3.1.

Used in Europe for over 10 years. New Zealand for 18 months.