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Thermakraft CoverTek 405 is a fire retardant self supporting synthetic roofing underlay for use under all claddings. Consisting of a microporous water resistant film, sandwiched between two layers of mould and shrink resistant spun-bonded polyolefin. It is intended for use as an alternative to the conventional kraft paper roof underlays, which are fixed over timber or steel framed roofs in order to limit the entry of wind into the roof cavity and to assist in the moisture management of the cladding system.
Thermakraft CoverTek 405 Fire Retardant Self-Supporting Roof Underlay has been appraised for use as a self-supporting roof underlay on buildings within the following scope:
Suitable for use as a roof underlay:
Clause B2 Durability: Performance B2.3.1 (a), not less than 50 years, B2.3.1 (b), 15 years and B2.3.2. Thermakraft CoverTek 405 meets these requirements.
Clause E2 External Moisture: Performance E2.3.2. When used as part of the cladding system, Thermakraft CoverTek 405 will contribute to meeting this requirement.
Clause F2 Hazardous Building Materials: Performance F2.3.1. Thermakraft CoverTek 405 meets this requirement and will not present a health hazard to people.
Thermakraft CoverTek 405 Roof Underlay has an AS 1530 Part 2 flammability Index of not greater than 5 and therefore meets the requirements of NZBC Acceptable Solutions C/AS2 to C/AS6, Paragraph 4.17.8 b), for the surface finish requirements of suspended flexible fabric used as an underlay to exterior cladding that is exposed to view in occupied spaces. It may therefore be used with no restrictions in all buildings.
Thermakraft Ltd are a leading New Zealand manufacturer of Synthetic and Bituminous underlays for the roof and wallProduct Enquiries