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UNI FR Flexible Air Barrier

UNI®FR is a New Zealand designed Flexible Air Barrier (FAB®) which has unique reinforcing and highly water resistant features allowing work to continue on the inside of the building for up to 90 days, without waiting for the cladding to be complete.

UNI FR is a non-woven breathable synthetic flexible air barrier, reinforced by a mesh scrim. UNI FR is available as a 2.74m x 36.5m roll and a soffit roll.

Key Features
  • No more hold ups due to cladding delays or bad weather — UNI/UNI FR provides temporary protection from UV exposure to timber framing for up to 90 days from installation
  • Secondary Line of Defence — Once installed UNI/UNI FR is a secondary line of defence against moisture over the life of the building. It is highly breathable and passes vapour from inside the building out
  • Saves money — UNI FR is much cheaper than Rigid Air Barriers (materials and labour) yet has most of the benefits
  • Very strong and tear resistant — UNI/UNI FR has a high vapour permeable, water resistant membrane sandwiched between two tough layers of non woven polyolefin fabric.
  • Full training and support — UNI FR is quick and easy to install. Masons is committed to supporting builders with their first time use of UNI/UNI FR. An installation video, written instructions and training is available
  • Fire retardancy — UNI FR is fire retardant
Scope of Use

UNI FR is highly water resistant and designed to provide temporary protection from weather conditions and UV exposure to timber framing without the installation of the cladding, which allows for the continuation of internal work on the house for up to 90 days after installation.

  • Suitable for commercial and residential construction.
  • Absorbent and can be used with all cladding systems.
  • Strong and durable and suitable for all areas of New Zealand including up to ‘Extra High’ wind zones of NZS 3604 using a specific fixing method. (See UNI/UNI FR installation instructions on
  • Performs well over timber or steel framing
  • Suitable as a non rigid backing for stucco plaster
  • Suitable as an air barrier on walls that are not lined including gable ends


Statement of Building Code Compliance

New Zealand Building Code Standard (NZBC) 

The following tests have been carried out in accordance with NZBC Acceptable Solution E2/AS1 Table 23

Resistance to water vapour transmission in accordance with ASTM E96 Pass
Resistance to water penetration in accordance with AS/NZS 4201.4:1994 Pass
Surface water absorbency in accordance with AS/NZS 4201.6:1994 Pass
Air resistance to BS 6538.3:1987 Pass
UNI FR has been tested to AS1530.2. It is rated as fire retardant Pass


Since being established in 1999, Masons has become a key supplier in the New Zealand building industry, offering a variety of quality products and tools for a whole range of building requirements.

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