Thermabar 344 is a light-weight, high tensile aluminium foil underlay used in walls and roofs to deflect heat and provide a clean white finish to the interior of commercial or industrial buildings.
Product Specifications
Thermabar 344 comes in three roll sizes:
| Width | Length | Coverage |
|---|---|---|
| 1350mm wide | 37m long | 50m² coverage* |
| 1350mm wide | 56m long | 75m² coverage* |
| 1350mm wide | 75m long | 100m² coverage* |
* Note: m² is the roll size for actual coverage, allow for laps and joins.
Scope of use
Thermabar 344 can be used in commercial and industrial buildings within the following scope:
- Buildings constructed with timber or steel framing.
- Used in conjunction with profiled metal roof and wall claddings. Where adequate ventilation and moisture and condensation control is provided to the building interior for the intended use.
- Situated in NZS 3604 Wind Zones up to and including ‘Extra High’ for roof application and 'Very High' for wall application.
- Thermabar 344 is generally used in buildings where a means of secondary weather defence is not required. In these situations, it can be used under roofing at any pitch. Where it is used as part of the cladding system, the designer is responsible for the design using the product property performance.
- When Thermabar 344 is used as a vapour control layer, all laps and junctions must be sealed with Thermakraft White General Purpose Tape.
General
- Fire retardant.
- Vapour barrier (non-breathable) or vapour control layer in ventilated commercial and industrial buildings.
- Unaffected by LOSP or other solvent based treated timber. However, LOSP or other solvent based treated timber must have sufficient time for the solvent to flash off in a well ventilated area. Recommended minimum 7 days.
- As aluminium based foils have the potential to conduct electricity, care must be taken when installing foils to ensure that there is no possible contact with any electrical cabling or installations. Foils are not suitable for installation in residential or associated buildings.
Limitations
- Thermabar 344 is not self-supporting (consider Thermabar 397 if self-support is required).
- Commercial and Industrial application only.
- Must NOT be exposed to the weather or UV for more than 7 days.
- Must NOT be used under translucent sheeting
- The suitability of Thermabar 344 for any local environment in commercial or industrial application (e.g. where production activities could degrade the product) must be considered by the designer.
- Thermabar 344 must NEVER come into contact with wet concrete or other lime based products.
Compliance
When Thermabar 344 is used, installed and maintained in accordance with Thermakraft literature, the product will meet or contribute to meeting the following provisions of the NZBC:
- Clause B2 Durability: Perfomance B2.3.1 (b), 15 years and B2.3.2. Thermabar 344 meets these requirements.
- Clause C3 Fire Affecting Areas Beyond the Fire Source: Performance C3.4 (c). Thermabar 344 meets this requirement.
Durability
Thermabar 344 will meet the performance requirements of NZBC Clauses B2, B2.3.1 (b) 15 years, providing:
- It is not damaged.
- Is not left exposed for more than 7 days (roof) same day coverage recommended.
- Installed to the MRM Roofing Code of Practice.
- Installed by or under guidance of Licensed Building Practitioners.
- Is compatible with cladding system used.*
* Note: specifiers and product user must confirm roof and wall cladding system compatibility with the underlay before installation.
Internal Moisture
Thermabar 344 is intended for use in commercial and industrial buildings that are subject to specific engineering design. These buildings generally do not require the use of an underlay for internal moisture control. Thermabar 344 must only be used in buildings with adequate means of ventilation, moisture and condensation control. Buildings incorporating high moisture loads such as swimming pools, freezers, cool stores, open liquid containers and moisture generating plants require specific design and are outside the product’s usage and BRANZ Appraisal scope.
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 MRM Roofing Code of
Practice).
Product Warranty
Standard Thermakraft warranty applies. Refer to Thermakraft Warranty Statement for further details. This item is available online here or call 0800 806 595.
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