TradeSelect Heavy Duty Sarking

Foil Wall Wrap & Roof Sarking Membrane

Trade Select™ Sarking HD is a Heavy Duty radiant barrier, designed for multi-purpose use as both roof sarking and a wall wrap. It is suitable for use in all roof and wall types. The reflective foil side provides extra R-value when installed facing an air cavity, and the multi- layer structure provides superior strength, flexibility and durability. Classified as High Water Barrier, Class 2 Vapour Barrier, Trade Select™ Sarking HD acts as a barrier to radiant heat, moisture ingress, draughts and dust penetration.

Product Advantages

  • 97% Reflective
  • High strength, light weight
  • Low flammability


Residential & Commercial Wall Wrap, Roof Sarking.

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Product Details
Product NameTrade Select™ Sarking HD
Roll Size1200 mm x 60 m (81m2)
1350 mm x 60 m (81m2)
1350 mm x 30 m (40.5m2)
1500 mm x 60 m (90m2)
1500 mm x 30 m (45m2)
Duty RatingHeavy
R Values
Declared Total System R-ValuesWinterSummer
Residential Roof
22° Pitch with Trade Select™ Sarking, unventilated
Light Weight Cladding
Battened out with Trade Select™ Sarking + R2.7 Fibrous Batt
Product Testing

Material Properties and Classifications
Trade Select™ Sarking HD classifications in accordance with AS/NZS 4200.1:2017.


Flammability IndexAS 1530.2-1993Low ≤ 5
Nominal Thickness0.12mm
Duty RatingAS/NZS 4200.1:1994Heavy
Vapour ControlAS/NZS 4200.1 Clause 2 Vapour Barrier
Vapour PermeanceASTM E96-2016 Procedure B0.004 µg/N·s
Water ControlAS/NZS 4201.4:1994Water Barrier
Air ControlAS/NZS 4200.1:2017Air Barrier
Resistance to Dry DelaminationAS/NZS 4201.1:1994Pass
Resistance to Wet DelaminationAS/NZS 4201.2:1994Pass
Shrinkage (Repeated wetting & drying)AS/NZS 4201.3:19940.0%
Emmitance ValueAS/NZS 4200.1:2017Printed side: 0.90, Foil side: 0.03
Bushfire Attack Levels
Trade Select™ Sarking Heavy Duty complies with AS 3959-2009 Construction of buildings in bushfire-prone areas for use in all BALs.
Seek independent advice regarding the selection of sarking prior to installation in the BAL design.
Specification Notes
When specifying, state the following:

Product Name: Trade Select™ Sarking HD

The insulation to be installed shall be Trade Select™ Sarking HD single-sided reflective laminate, emittance bright side 0.03. Product is manufactured by Ametalin and shall be installed in accordance with AS/NZS 4200.2:2017 Pliable Building Membranes and Underlays, Part 2: Installation.

Emittance Value: 0.90, 0.03
Emittance Classification: IR Non-reflective, IR Reflective
Vapour Control Classification: Vapour Barrier, 0.004 µg/N·s
Air Control Classification: Air Barrier
Water Barrier Classification: Water Barrier
Duty: Heavy in accordance with AS/NZS 4200.1:2017

Installation Instructions

Trade Select™Sarking HD should be installed in accordance with AS/NZS 4200.2: 1994 Pliable Building Membranes and Underlays, Part 2: Installation Requirements.


Trade Select™ Wall Wrap Sarking is not designed to withstand prolonged direct exposure to the elements. Accordingly, the outer construction envelope should be installed without delay. Aluminium foil should not come into contact with wet concrete or mortar, as the aluminium is susceptible to alkali corrosion. If installed within 500 metres of the sea, or in a non-residential building where foil surfaces may be exposed to a corrosive atmosphere (including agricultural sheds), foil surfaces should face an enclosed, un-vented air space. To ensure optimum thermal insulation performance, as well as satisfactory durability, a 25 mm air space adjacent to the foil side of the product is recommended.


In roofs, Trade Select™ Sarking is to be installed as a continuous membrane, blue side facing out and laid loosely over rafters on 450 mm centres with a minimum drape of 40 mm. For larger rafter spacings in metal roofs, the drape should be increased proportionally. Joins must be overlapped by no less than 150 mm with all top layers overlapping the outside of lower layers to facilitate drainage. AS 3959-2009 Construction of buildings in bush re-prone areas requires that all sarking products be installed under roof battens.

When TradeSelect™ Sarking is used under tiles it must be installed under battens in order to comply with AS/NZS4200.2:1994. Under metal roofing the preferred installation is also under the battens.TradeSelect™ Sarking can be installed above the battens, but performance may be reduced and problems may arise under certain environmental conditions. Specifically, condensation forming under the roof may pool behind battens due to a breach in the integrity of the Trade Select™ Sarking membrane; condensation may also form on the underside of Trade Select™ Sarking where contact is made with the roofing material. Adequate slack in the material must be provided, equal to the specified sag, to accommodate shrinkage of Trade Select™ Sarking due to high temperatures in close proximity to the metal roofing.


In framed walls and gables, Trade Select™ Sarking should be installed horizontally as a continuous membrane by fixing to all framing members with the blue side facing out. Trade Select™ Sarking should extend from the top plate to the bottom plate on concrete slabs or bearers in timber construction. Fixings are to be no more than 450 mm apart and should be galvanised clouts or staples for fastening to timber construction and tech screws for fastening to steel constructions. In high wind areas, it is recommended to install using at punched multi-point fasteners or cap screws. Horizontal, vertical and end overlaps must be 150 mm if not taped or 50 mm taped with Ametalin Insulation/Ducting Tape, with all top layers overlapping the outside of lower layers to prevent water ingress. Stagger any vertical overlaps. Any damage made to Trade Select™ Sarking during installation including holes and tears must be repaired.

Where Trade Select™ Sarking is intended to act as a vapour barrier, tape and seal all overlapped joins, penetrations and discontinuities with Ametalin Insulation/Ducting Tape to prevent air movement. When Trade Select™ Sarking is installed as a sarking membrane, all penetrations shall be sealed or turned up to facilitate drainage around penetration. Ensure window and door openings are cut neatly and carefully and are properly tted at ashing points. Trade Select™ Sarking shall be cut back from any hot flue to avoid being a fire hazard. This can be achieved by a clear space of at least 50 mm, or as recommended by the manufacturer of the flue and approved by the local authority.