Penetration Seals

Airtight Solution for Round Penetrations
Documentation Downloads

Mason Penetration Seals are air seal flashings designed for cavity construction where pipes or wires penetrate building cladding and pass through the air seal membrane such as synthetic building wrap, or a flexible or rigid air barrier.


  • Commercial and Residential construction
  • UNI FR is absorbent and can be used with all cladding systems.
  • UNI FR is strong and durable, suitable for all areas of
  • New Zealand including up to ‘Very High’ wind zones of NZS 3604 and “Extra High” over rigid wall underlays.
  • UNI FR performs over timber or steel framing.
  • UNI FR is suitable to be used as a non rigid backing for stucco plaster.
  • UNI FR is suitable as an air barrier on walls that are not lined.
  • Vertical use only, not suitable as a roof underlay.

Available in-store at:

TRADIES: This product might not necessarily be a stocked item by your merchant however can be ordered in.

MERCHANTS: To enquire about this product or to place an order, please contact your local Mason’s rep >