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The recommended material for use as sarking is a Reflective Foil Laminate which provides weather-proofing as well as insulation. It has a high reflection and low emission factors for low temperature (thermal) radiation found within buildings. The Reflective Foil Laminate is a flexible sheet material which is supplied as a roll. It is installed over the rafters, under the tile battens and has many benefits to offer when used under the roof covering. Sarking reflective foil insulation material should be a double sided, anti-glare type with a maximum flammability index of 5 in accordance with AS/NZS 4200.1-1994. Using reflective foil laminate as a sarking material is recommended because of its excellent insulating and weatherproofing properties. Sarking reduces approximately 90% of radiant heat in the summer and between 30% to 40% heat loss in the winter. It has excellent water proofing qualities and when installed properly prevents damage occurring to ceiling materials and interior fixtures and fittings. Sarking eliminates dust intrusion and reduces sound penetration. It also helps prevent fire, from an outside source, igniting inside the roof space. Its use is highly recommended in buildings which are located in high risk bush fire areas. When wind gusts occur, sarking reduces the impact of uplift forces on the roof tiles.
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