COVERTEK 407
Self-supporting roof sarking
Thermakraft Covertek 407 is our strongest synthetic underlay, designed as a means of managing condensation, water vapour transfer and water ingress in trying conditions, including applications where the roof pitch is 3° and above.
Product Specifications
Covertek 407 comes in one standard roll size:
| CT4071250040 | 1250mm wide | 40m long | 50m² coverage* |
|---|
* Note: m² is the roll size for actual coverage, allow for laps and joins.
Cut to length available - contact your Kingspan Representative.
Scope of use
Covertek 407 can be used as a roof sarking on both residential and commercial buildings within the following scope.
- Class 1 and Class 10 buildings; and,
- Class 2 to Class 9 buildings subjected to specific weathertightness design; and,
- Constructed with timber and steel framing in accordance with BCA; and,
- With masonry tile, metal tile and profiled metal roof cladding; and,
- Situated in non-cyclonic wind zones up to, and including N3.
- Building designers are responsible for the building design and for the incorporation of Thermakraft Covertek 407 roof sarking into their design in accordance with the declared properties and the instruction of Kingspan Insulation.
- Self-supporting - Refer to installation guide regarding underlay support requirements.
- Not suitable for roof pitch less than 3 degrees.
- Will provide temporary weather protection during construction (maximum 28 days), same day coverage recommended.
General
- Low Flammability Index when tested to AS 1530.2:1993.
- Unaffected by LOSP or other solvent based treated timber. However, LOSP or other solvent based treated timber must have sufficient time for the solvent chemical to flash off in a well-ventilated area. Recommended minimum 7 days.
- Tear resistant and strong.
Limitations
- Cannot be used as a wall wrap.
- Must NOT be exposed to the weather or UV for more than 28 days.
- Must NOT be used under translucent sheeting.
Compliance
Covertek 407 is an alternative solution in terms of BCA compliance. Refer to BRANZ appraisal No. 904 for further details. When Covertek 407 roof sarking is used, installed and maintained in accordance with the statements and conditions outlined in Kingspan Insulation literatures and BRANZ appraisal, the product will contribute to meeting the following provisions of the BCA:
- BCA Volume 1 – Class 2 to Class 9 Buildings
- Part F3P1 – Weatherproofing
- BCA Volume 2 – Class 1 and Class 10 Buildings
- Part H2P2 - Weatherproofing
Full BCA compliance details can be found in BRANZ Appraisal No. 904.
Control of Condensation
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;
- Humid, and/or cold climatic regions.
- Warm/Skillion roof construction.
- Low roof cavity air volume and restricted air movement.
- Omitting Vapour Control Layers.
- Occupancy activities which have high moisture loading on conditioned spaces.
- Ceiling penetrations and entry of warm air into roof cavities.
- Low pitched roof.
- Bulk insulation.
- Building structures ability to naturally dry construction moisture.
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.
Durability
Covertek 407 is expected to have a serviceable life equal to that of the roof cladding provided:
- It is not damaged.
- Installed in accordance with installation guide.
- Is not left exposed to the weather or UV for more than 28 days.
- Is compatible with cladding system used.*
* Specifiers and product user must test for roof cladding system compatibility with the underlay before installation.
Product Warranty
Standard Kingspan Insulation warranty applies. Call 1300 247 235 for further details on Kingspan Insulation Warranty Statement.
Product Performance
| Properties AS/NZS 4200.1:2017 | Test Method/Standard | Property Performance Requirement | Actual Property Performance | Classification AS/NZS 4200.1:2017 |
|---|---|---|---|---|
| Moisture Shrinkage | AS/NZS 4201.3:1994 | ≤ 0.5% | Pass | - |
| Surface Water Absorbency | AS/NZS 4201.6:1994 | ≥ 100 g/m² | Pass | - |
| Water Vapour Resistance | ASTM E96 Part B - 2016 | ≤ 7 MN s/g | Pass | - |
| Resistance to Water Penetration | AS/NZS 4201.4:1994 | ≥ 100mm | Pass | - |
| Emittance | AS/NZS 4201.5:1994 | - | - | Non-reflective |
| Flammability | AS 1530.2:1993 | ≤ 5 | Pass | Low |
| Edge Tear Resistance | AS/NZS 4200.1:2017 | - | Machine direction (average) > 247 N | Extra Heavy |
| - | Cross direction (average) > 92 N | Extra Heavy | ||
| Tensile Strength | AS 1301.448s:1991 | - | Machine direction (average) > 9.6 kN/m | Medium |
| - | Cross direction (average) > 4.0 kN/m | Extra Light |
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