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Covertek 403 (wall)

Covertek 403 Plus is a fire retardant, absorbent and breathable synthetic wall underlay, constructed using a microporous water resistant film sandwiched between two layers of shrink resistant spun-bonded polyolefin. Designed as a means of managing condensation, water vapour transfer and water ingress in wall applications.

Key Features

  • BRANZ appraised
  • Water barrier
  • Fire retardant
  • Breathable
  • Absorbant
  • Strong & durable
  • Light weight


  •  Can be used as direct fix or cavity fix for wall constructions, more stable and more shrink resistant than kraft based underlays.
  •  May be installed during adverse conditions (rain) without affecting durability or performance.
  •  Will not increase risk of condensation as compared with comparable kraft underlays.
  •  Is light weight with tear resistance.
  •  Has a 150mm printed lap-line