Description

Masons UNI® PRO Flexible Air Barrier is a wall underlay and flexible air barrier, and is suitable for use as temporary weather protection to allow interior works to continue inside the building without the exterior wall cladding being fully in place for up to 150 days.

Masons UNI® PRO Flexible Air Barrier is a tri-laminate synthetic sheet consisting of two outer non-woven layers - a blue front face and a white rear face - and a middle synthetic 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".

Scope

1. 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.

2. 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.

3. 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.