Relfectashield is an air and vapour permeable walling underlay that is suitable for use on both timber and steel frame buildings. It has an enhanced foil surface and unique patented three-layer composition, providing high thermal performance. Reflectashield TF 0.81 should be installed on the external face of the timber frame, with the foil side facing out. It provides excellent breathability and secondary protection during construction as well as enhanced thermal performance when placed next to a cavity. Once Reflectashild TF 0.81 is applied to the walls, the primary wall covering should be installed within 3 months. Features and Benefits Improved thermal resistance Creates surface void Enhanced foil surface Complies with BS4016, TRADA & NHBC requirements Water resistant Vapour permeable Complies with BS5250 Product Specifications Length: 50m Width: 1450mm Roll Coverage: 72.5m2 Thickness: 0.55mm R-Value: 0.81 m2K/W Water Vapour Resistance Sd: 0.083m