A glass mineral wool roll providing high levels of acoustic insulation in partitions, walls and floors to meet acoustic requirements in domestic and non-residential applications. The product carries a system lifetime performance guarantee when used in British Gypsum SpecSure warranted drywall and floor systems. The rolls push-fit between 600mm stud centres making it easy to install. Properties Thickness: 25mm. Length: 20m. Width: 600mm. Pack quantity: 2x rolls. Pack coverage: 24m2. Thermal conductivity: 0.039 W/mK. Thermal resistance: 0.60 mK/W. Fire rating: Euroclass A1 fire rating when classified with BS EN 13501-1.