Description

Bayonet BayoWrap Roof 03 Underlay is a self-supporting synthetic building underlay for use under roof (including durable) claddings.

Bayonet BayoWrap Roof 03 Underlay is a synthetic underlay and consists of a micro-porous water resistant film laminated to two layers of nonwoven spun-bonded polyolefin. It is coloured black on the top face and white on the bottom face and is supplied in rolls 1.5 m wide x 34 m long.

Scope

1. Bayonet BayoWrap Roof 03 Underlay is certified for use on timber or light steel framed roofs on buildings:

• a) within the limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area, and
• b) situated in wind zones up to and including Extra High (as defined in NZS3604), and
• c) with masonry tile, metal tile or profiled metal roof cladding, and
• d) with a minimum roof pitch of 3 degrees, and
• e) where the underlay is not exposed to view in occupied spaces.

2. Bayonet Bayowrap Roof 03 Underlay shall be:

• a) installed in accordance with the Bayonet Bayowrap Self Support Roof 03 Product Technical Statement & Installation Guide V3, September 2022, and
• b) where the roof pitch is between 3 degrees and 10 degrees, be installed horizontally or vertically when supported by a corrosion resistant roof underlay support, or
• c) where the roof pitch is greater than 10 degrees, installed horizontally or vertically, spanning no greater than 1200mm between supports, and
• d) separated from fireplaces, heating appliances, flues and chimneys in accordance with the requirements of NZBC Acceptable Solutions C/AS1 and C/AS2, Paragraph 7.5.9 for the protection of combustible materials.

3. Bayonet BayoWrap Roof 03 Underlay shall not be exposed to the weather or UV light for more than 7 days.