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COVERTEK 401
Self-supporting synthetic roof and wall underlay.
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Product Specifications
Covertek 401 comes in four roll sizes:
Width | Length | Coverage |
---|---|---|
1350mm wide | 18.6m long | 25m² Coverage* |
1350mm wide | 37m long | 50m² Coverage* |
1350mm wide | 55m long | 75m² Coverage* |
2700mm wide | 33.4m long | 90m² Coverage * |
* Note: m² is the roll size for actual coverage, allow for laps and joins.
Roof Application
Wall Application
Roof Application:
Designed for use as a roof underlay within the following scope:
Wall Application:
Contributes to meeting the Performance Requirements of NZBC Clauses B2, Durability (B2.3.1 (a) 50 years, B2.3.1 (b) 15 years and B2.3.2), E2 External Moisture E2.3.2) and F2 Hazardous Building Materials F2.3.1, providing:
* Note: specifiers and product user must test for wall cladding system compatibility with the underlay before installation.
In climatic regions where condensation risks are high, such as cold or high humidity areas, care needs to be taken in specifying the correct design and installation to prevent moisture build-up in the roof cavities.
Factors which adversely affect the condensation risk in roofing systems include:
Skillion and Warm Roof Construction are particularly sensitive to moisture accumulation and the design and installation of roof construction needs to take into account the higher condensation risks. Refer to the NZ Metal Roof and Wall Cladding Code of Practice (COP) for details.
For passive ventilation of the roof space, it is recommended that all roof underlays are terminated at the ridge, and if not it should be slit or slotted to allow for passive ventilation. For further information refer to the NZ Metal Roof and Wall Cladding COP.
Standard Thermakraft warranty applies. Refer to Thermakraft Warranty Statement for further details. This item is available online here or call 0800 806 595.
NZBC E2/AS1 Table 23 (NZ2295)Wall Underlay Properties | Absorbency | Vapour Resistance | pH of Extract | Shrinkage | Water Resistance | Air Resistance |
---|---|---|---|---|---|---|
Property Performance Requirement | ≥ 150gsm | ≤ 7MN.s/g | ≥ 5.5 and ≤ 8 | ≤ 0.5% | ≥ 100mm | ≥ 0.1 MN. s/m3 |
Property Performance | Pass | Pass | Pass | Pass | Pass | Pass* |
* Note: Can be used as an air barrier.
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