MASONS Roof Underlays – VHP Value, VHP Strong, VHP Ultra & VHP Maxi
- Abbreviation
- CMNZ70098 version 4
- Version
- 4
- Valid from
- 22/07/2024
- Information provider
- Ministry of Business, Innovation and Employment,
- Author
- Bureau Veritas Australia Pty Ltd
- Information type
- Product Certificate (CodeMark),
- Format
- PDF,
Description
Masons Roof Underlays are for use as a self-supporting roofing underlay and as a flexible air barrier.
Masons roof underlays are manufactured from synthetic multi-laminate spun-bonded, non-woven polypropylene membranes.
This certificate covers the following products:
- VHP Value (125 gsm)
- VHP Strong (140 gsm)
- VHP Ultra (180 gsm)
- VHP Maxi (220 gsm)
These products are described in section 10.
Scope
1. Masons Roof Underlays are certified for use as a roof underlay and air barrier:
- a) on buildings situated in wind zones up to and including Extra High (as set out in NZS3604) with a minimum roof pitch of 3°,
- b) under masonry or metal tile and profiled metal roof claddings,
- c) in all locations including where it is exposed to view.
2. Masons Roof Underlay shall be:
- a) installed in accordance with the manufacturers Roof Underlay Installation Instructions, version 3.0 February 2024, and
- b) installed run vertically or horizontally with or without support for roof pitches greater than 10°, run horizontally with or without support or run vertically with support for roof pitches less than 10°, provided that support is provided where the span is greater than 1200mm, and
- c) protected from direct sunlight within 21 days of installation.