UNI® PLUS is a fire retardant flexible wall underlay, with the following suitability:

Location:

• In locations with a wind design pressure (ULS) of up to and including 4.6 kPa (which includes all NZS 3604:2011 wind zones).
• For 'Very High' wind zones over rigid wall underlays
• In seismic zones up to and including seismic zone 3
• In all exposure zones
• Further than 1 m from a relevant boundary

Building:

• For commercial and residential construction
• Designed for use with all cladding systems
• Performs on timber and steel framed buildings
• As a temporary cladding for up to 90 days
• With buildings of all building heights, up to the permissible wind design pressure of 4.6 kPa
• With cladding and joinery that complies with the relevant provisions of the NZ Building Code for the site and location
• Suitable for use as a non-rigid backing for stucco plaster
• UNI® PLUS is suitable as an air barrier on walls that are not lined
• For vertical use only, not suitable as a roof underlay
• UNI® PLUS Must be covered with a suitable wall lining to any occupied spacings

• UNI PLUS (or any flexible air barrier) cannot provide seismic (bracing or racking), and fire-resistance
• For lightweight steel, a thermal wrap must be installed
• Where a building height is greater than 10 m and upper levels contain sleeping uses or other property the external wall must be subject to specific fire engineering
• In occupied spaces, UNI PLUS must always be installed in conjunction with an internal lining
• UNI® PLUS must be covered within 90 days from installation

NEW ZEALAND BUILDING CODE STANDARD (NZBC)

• UNI PLUS meets or exceeds the requirements of the NZBC
• Product Assurance Supplier Statement; PASS. Documentation is available from the downloads button on this page

If designed, installed and maintained in accordance with all Masons Plastabrick’s requirements, UNI PLUS will comply with or contribute to compliance with the following performance claims:  

B1 STRUCTURE: B1.3.1, B1.3.2, B1.3.3 (a, e, f, h, j, m, q, & UV), B1.3.4 (a, b, c, d, e)

• Meets requirements of NZS 2295:2006; tested to ASTM D882 for tensile properties, TAPPI T470 for resistance to tearing. NZS 2295:2006 is referenced in E2/AS1 for flexible underlays [Scion, 01/2022].

B2 DURABILITY: B2.3.1 (a), B2.3.2 (b)

• Meets requirements of NZS 2295:2006; tested to ASTM G154 for accelerated UV ageing [Scion, 01/2022].

FIRE AFFECTING AREAS BEYOND THE FIRE SOURCE: C3.4 (c)

• Meets requirements of NZS 2295:2006; flammability index of 1 when tested to AS 1530.2:1993 [NZWTA, 01/06/2021].

E2 EXTERNAL MOISTURE: E2.3.2, E2.3.5, E2.3.7 (a, b, c)

• Meets requirements of NZS 2295:2006; tested to AS/NZS 4201.4 for water penetration, tested to AS/NZS 4201.6 for surface water absorbency, tested to ASTM E96 Procedure B for Water vapour resistance [Scion, 01/2022].
• Installation details and requirements in accordance with E2/AS1.

F2 HAZARDOUS BUILDING MATERIALS: F2.3.1

• Manufactured to EN 13859-2:2014; product does not emit harmful materials based on supplier’s technical data and testing specification and material safety information [Masons Plastabrick, 30/08/2021a, 30/08/2021b].
• Use in accordance with the supplier’s requirements [Masons Plastabrick, 01/2022].

Masons Building Products has been in the industry for over 20 years. Customer satisfaction is paramount. A dedicated team of Masons Representatives cover NZ nationwide to assist and instruct customers in using Masons products. 

Installation

Masons UNI PRO is to be installed with the correct components: 

• Masons 40 Below flashing tapes (ensuring weather-tightness around windows and joinery), 
• Masons UNI Fasteners or UNI Cap Nails (to an engineer specified fixing pattern which ensures wind-loading up to ‘Extra High’)
• Masons Penetration Seals
• Masons Corner Guards
• Masons PEF Backing Rod
• Masons BrickTies

Collectively these products complete the weather-tightness of the building membrane. 

General Installation Instructions:

• Fix with the printed side out
• Run the wrap horizontally
• Pull taut over the framing before fixing
• Only to be fixed with Masons UNI Fasteners either with a gun or hammer. Staples must not be used.
• For timber frames: use 32mm Nail/washer. For steel frames: use UNI washers with either a Phillips or square drive self-drilling screw.
• Be lapped, not less than 75mm at horizontal joints; Have upper sheets lapped over lower sheets to ensure that direction of laps will allow water to be shed to outside of the wall underlay
• Be lapped, not less than 150mm over studs at vertical joints 
• Extend 50mm below bottom plate or bearer

UNI PLUS must be installed by a Licensed Building Practitioner using Mason's full installation instructions.

These instructions are available as a video or a printed version in the downloads button of this page. Training on-site can also be arranged via a Masons Rep.

Storage and Handling

Masons UNI PLUS, whether on or off-site should:

• Be stored on end under a cover, in a clean and dry area 
• Protect the rolls from crushing or damage
• When fixing the product in windy conditions, care must be taken due to the large sail area created by wide roll widths