Thermakraft Covertek 407 1250mm x 40m (50m2)

Heavy duty self-supporting roof and wall underlay.

Covertek 407 is our strongest synthetic underlay, designed as a means of managing condensation, water vapour transfer and water ingress in the most trying conditions including applications where the roof pitch is 3° and above.

Covertek 407 is fire retardant.

Roof Application

• Suitable with masonry tile, metal tile and profiled metal roof cladding.
• Suitable for timber or steel framed buildings.
• Can be used on roofs up to and including NZS 3604 Extra High wind zones.
• Self-supporting - Refer to installation guide regarding underlay support requirements.
• Not suitable for roof pitch less than 3 degrees.
• Will provide some temporary weather protection during construction (maximum 7 days), same day coverage recommended.

Wall Application

• Can be used with timber and steel framing, either direct or in conjunction with an 18mm minimum drained cavity.
• Suitable with absorbent (e.g. timber, brick or fibre cement) or non-absorbent wall claddings (e.g. metal or plastic).
• Suitable with masonry veneer in accordance with NZBC Acceptable Solution E2/AS1 or NASH Building Envelope Solutions.
• Is suitable for use in Wind Zones of NZS 3604 up to and including ‘Very High’ when used as a standalone flexible underlay, and ‘Extra High’ when used as a flexible underlay over a rigid wall underlay.
• Is suitable as an air barrier in unlined wall spaces.
• Will provide some temporary weather protection during construction (maximum 60 days for wall application).