ARDEX Butynol® Butyl Rubber Roofing Membrane System
- Valid from
- Information provider
- Ministry of Business, Innovation and Employment
- SAI Global
- Information type
- Product Certificate (CodeMark)
ARDEX Butynol® is a flexible synthetic rubber waterproofing membrane supplied in rolls of 1.4m width and 17.86m long. Available in a range of thicknesses and colours:
- 1.0mm (black)
- 1.5mm (black)
- 2.25mm (black)
- 1.2mm (dove grey)
- 1.5mm (various colours).
ARDEX Butynol® is a single layer membrane applied to the outside of a substructure of a building for waterproofing decks, roofs, and box gutters.
The Ardex Butynol Membrane system must be installed by an Ardex NZ approved installer as per the ‘ ARDEX Butynol® Installation Instructions (May 2018)’.
The Ardex Butynol Membrane system may be used:
- a) In all exposure zones excluding microclimates (as per NZS 3604:2011 para 4.2).
- b) Up to 6.0 kPa ULS wind pressure differential for buildings subject to specific engineering design.
- c) Where the substrate is plywood sheet or suspended reinforced concrete slab, or polyiso insulation board.
- d) for all wind zones up to and including extra high for buildings within the scope limitations of NZBC. Acceptable Solution E2/AS1 para 1.1; or within the scope limitations of NZBC acceptable Solution. E2/AS1 with regards to building height and floor plan area subject to specific engineering design.
Unless protected by pavers or other protection, a minimum 1.5mm thick membrane must be used on a trafficable deck, in accordance with the Manufacturer’s Install Instructions ‘ARDEX Butynol® Installation Instructions (May 2018)’ & product datasheet ‘ ARDEX Butynol® Butyl Rubber Membrane (August 2019)’.
LOSP treated plywood must NOT be used as a substrate, as per the ‘Substrate Specifications For membrane Applications (December 2018)’.
The substrate structure must be designed to shed precipitated moisture. Allowance for deflection and settlement of the substrate must be made in the design to ensure falls are maintained and no ponding of water can occur. For buildings designed in accordance with NZS 3604:2011 the following meet these requirements:
- a deck constructed to a fall not less than 1.5 degrees (1:40)
- a roof constructed to a fall not less than 2 degrees (1:30)