Use premium-performance Kooltherm products to save space in wall, floor, soffit/structural ceiling, and sandwich wall applications. Kooltherm K8 cavity board has a fiber-free rigid thermoset phenolic core, faced on both sides with a low emissivity composite foil that is used for insulation in partially filled cavity walls. Kooltherm K20 sandwich board’s rigid thermoset insulation is ideal for tilt-up and precast concrete wall applications and is designed to enable thinner wall assemblies by offering an R-value of 17 on 2 inches.