UNI PRO Flexible Air Barrier

• Helps keep construction moving. Once installed it allows the continuation of internal work on the build, without cladding in place for up to 150 days after installation. 

• Once installed, UNI PRO is a secondary line of defence against moisture over the life of the building.

• Highly breathable, passing vapour from the inside of the building out.

• A fraction of the cost of rigid air barriers (materials and labour) whilst having most of the benefits.

• 22% thicker than UNI and much thicker and stronger than standard building paper/wrap. 

• Quick and easy installation with many resources to assist first-time users.

• Codemark Certified.

• A non-woven, absorbent, water-resistant, synthetic wall underlay.

• Comprised three polypropylene layers: two outer layers of non-woven polypropylene with a middle layer of a functional-technical film.

• Has a blue front face and a white rear face - and a middle membrane which is dark grey. Both sides of the sheet have a fine embossing pattern. The sheet is 2.74 metres wide and marked UNI PRO Flexible Air Barrier.

Masons UNI PRO Flexible Air Barrier is certified for use as a wall underlay and air barrier on buildings:

a) within the scope limitations of:

i. NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area for timber-framed construction; or
ii. NZBC Acceptable Solution E2/AS4 with regards to building height and floor plan area for light-steel framed construction, and

b) situated in wind zones (as defined in NZS 3604:2011) up to and including ‘Extra High’, provided stud and fixing centres are no greater than specified in the Masons UNI® PRO Flexible Air Barrier Design and Installation Guide V1.0, November 2021, and

c) with absorbent or non-absorbent wall claddings directly fixed to the frame, or installed over an 18mm minimum drained cavity; or with masonry veneer, in accordance with NZBC Acceptable Solution E2/AS1 for timber-framed buildings or NZBC Acceptable Solution E2/AS4 for steel-framed buildings, and

d) where the underlay is not exposed to view in an occupied space.

Masons UNI PRO Flexible Air Barrier shall be:

a) installed in accordance with the MASONS UNI® PRO Flexible Air Barrier Design and Installation Guide V1.0, November 2021, and

b) 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, and

c) protected from sunlight within 150 days

Contribution to compliance with Building Code clause H1.3.1(b) is conditional on

a) the element incorporating UNI PRO Flexible Air Barrier being part of the thermal envelope of the building, and

b) horizontal and vertical laps being securely taped.

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).

• 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.

• Suitable as an air barrier on walls that are not lined.

• For vertical use only, not suitable as a roof underlay.

• UNI must be covered with a suitable wall lining to any occupied spacings.

• UNI (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 must always be installed in conjunction with an internal lining.

• UNI must be covered within 90 days from installation.

UNI PRO meets or exceeds the requirements of the NZBC. For details, please visit the MBIE website to view the Codemark

Product Assurance Supplier Statement; PASS. Documentation is available from the downloads button on this page.

Masons UNI PRO, whether on or off-site should be stored on end and under a cover, in a clean, dry area. Protect the rolls from crushing or damage.

Take care when fixing the product in windy conditions, due to the large sail area created by wide roll widths.

UNI Flexible Air Barrier must be installed by a Licensed Building Practitioner using Mason's full installation instructions available as a video or a printed version on this page. On-site training can also be arranged if appropriate through your Masons Rep.

• Fix with the printed side out.

• Run the wrap horizontally and pull it taut over the framing before fixing

• Only to be fixed with Mason's UNI Fasteners either with a gun or hammer. Staples must not be used.

• For timber frames: use a 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 the bottom plate or bearer