SilverSark 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 a Water Barrier and Class 2 Vapour Barrier, SilverSark acts as a barrier to air, radiant heat, moisture ingress and dust penetration. SilverSark is a flexible four-layer product made with a combination of anti-oxidant UV-stabilised woven polypropylene, 97% reflective aluminium foil and fire-resistant polymer adhesive, backed by a UV-stabilised polymer flood coat.