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Covertek 407


Covertek 407 is a fire retardant, absorbent and breathable synthetic self-supporting roof underlay constructed using a microporous water resistant film sandwiched between two layers of spun-bonded polyolefin. Designed as a means of managing condensation, water vapour transfer and water ingress in roof applications.

Key Features

  • BRANZ appraised
  • High water barrier
  • Fire retardant
  • Breathable
  • Absorbent
  • Self-Supporting
  • Strong & Durable


  •  Covertek 407 can be used in direct fix or cavity fix for roof construction. 
  •  It is more stable and more shrink resistant than kraft based products. 
  •  Covertek 407 may be installed during adverse conditions (rain/snow) without affecting durability or performance. 
  •  It will not increase the risk of condensation compared to comparable kraft underlays.    
  •  Has a 150mm lap line printed on each edge.