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Covertek 401


Covertek 401 is an absorbent and breathable synthetic roof underlay, constructed using a microporous water resistant film sandwiched between two layers of shrink resistant spun-bonded polyolefin. Designed and made in New Zealand, a lightweight high strength underlay suitable for use unsupported where fire retardancy is not required.


Key Features

  • BRANZ appraised
  • High water barrier
  • Breathable
  • Absorbant
  • Self supporting
  • Strong & Durable


  •  Can be used in direct fix or cavity fix for roof construction.
  •  Is more stable and more shrink resistant than kraft paper based underlays.
  •  May be installed during adverse conditions (rain/snow) without affecting its durability and performance.
  •  Will not increase the risks of condensation as compared with comparable kraft paper underlays.
  •  Has a high tear resistance and is light weight.
  •  Has a 150mm lap line printed edge.