Space Combi-Roll 100mm is a glass mineral wool product with pre-cut perforations, enabling use between either 400mm or 600mm ceiling joists. It is compression packed to minimise handling and will expand to the required thickness when unwrapped. Lightweight and economic insulation. Greatly improves the thermal efficiency of your home. Made using recycled glass bottles. R-value 2.25 m2K/W. Area per roll 13.89m2. Made with ECOSETM Technology- a new benchmark in sustainability. Size (H)1218, (W)114, (D)10cm. NB: For DIY use only - This product is subsidised by E.ON under the Carbon Emissions Reduction Target. It is not for use in new buildings. Further subsidies cannot be claimed by professional installers on this product. Max purchase 100m2 per customer.