SF19 multi-layer foil insulation is an advanced version of SuperFOIL's favourite reflective insulation SF19 for use in roofs and walls for both new build and retrofit applications. SF19 benefits from improved performance and uses the advanced production techniques as developed for their other new products. SF19 achieves R values of 2.97 for walls and 2.49 for Roofs. Providing better options and solutions as low as U0.10. SF19 comes in new convenient rolls that are 1.5m by 10m. Properties Length: 10m.Width: 1.5m.Roll size: 15m2.Thickness installed: 45mm.Weight per roll: 13kg.Thermal Resistance - rValues:For pitched roofs: 2.49m2K/W.For Walls: 2.97m2K/W.Core rValue: 1.54m2K/W.Layers:Polypropylene reinforced heavy outer laminated foil: 2x layers.Aluminium coated reflective foil PET layers: 4x layers.Loft quilt: 5x layers.Total layers: 11x layers. Application Air seal & radiant barrier.Building regs compliant.Horizontal or vertical fitting.25mm air gap required.Cut with knife or scissors.