The Kingspan Kooltherm K108 Cavity Board is a performance rigid thermoset fibre-free phenolic insulation core faced on both sides with a low emissivity composite foil. It is designed to limit thermal bridging and uncontrolled airleakage via junctions in cavity wall constructions. It is unlikely to become ignited within the cavity. However, if fire does penetrate into an unventilated cavity, the amount of air present will be insufficient to support combustion, and flame spread will be minimal. It has a thermal conductivity of 0.019W/mK across all different types of thicknesses with a thermal resistance of 5.55m2K/W.