Kooltherm Kooltherm K103 is a premium performance floor insulation board, with a lower lambda value and a fibre-free rigid thermoset phenolic core. Benefits: Premium performance rigid thermoset insulation – Thermal conductivities as low as 0.018 W/m.K Negligible smoke obscuration. Class O / low risk fire rating. No requirement for a vapour control layer. Quick response floor heating – prevents heat loss through ‘heat sump’. Minimises the cost of related items – soil removal, DPMs, service connections. Front Face of board is Foil Faced. Reverse Face of the board is Glass Tissue Core - Premium performance lower-lambda rigid thermoset phenolic insulation manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP)