Isover Spacesaver Roll glass fibre insulation is a high quality glass fibre mineral wool insulation, it comes in roll form for thermal application in cold roof and loft floors. Rolls are pre-perforated at 3 x 386mm and 2 x 580mm to allow easy installation between joist centres of 400mm or 600mm. Isover Spacesaver glasswool provides thermal insulation for cold roof constructions in both new-build and renovation projects. Rolls are installed in two layers, the first layer between the joists and the second layer cross laid over the joists InstallationIsover Spacesaver is manufactured from high quality glass mineral wool which makes it lightweight and easy to handle, cut and install. Water resistantResilient to moisture damage in storage, during transportation and on site during installation. QualityAll Isover products are manufactured under Quality Management Standard - ISO 9001:2008.Isover Spacesaver is manufactured under BS EN13162:2012 and BS EN13172:2012 (Thermal insulation products for buildings - Factory made mineral wool (MW) products). Recylced contentIsover glass mineral wool insulation is manufactured from up to 86% recycled glass that would otherwise go to landfill. This makes Isover one of the most environmentally sustainable insulation products on the market today. EnviromentalAll Isover products are manufactured under Environmental Management System - ISO 14001:2004.Zero ODP (Ozone Depletion Potential), GWP < 5 (Global Warming Potential).The manufacturing process does not use or contain CFCs, HCFCs or other damaging gases. Properties Thickness: 200mm.Length: 1160mm X 5200mmCoverage: 6.03m2.Thermal resistance: 4.65 m²K/W.Thermal conductivity: 0.044 W/mK.Fire rating: Euroclass A1 to BS EN13501-1.Class &apos;O&apos; compliance.