Isover's Spacesaver Attic Insulation G3 is a pre-perforated insulation roll designed for use in attic flooring with either 400mm or 600mm centre joists. It features a thermal performance of 0.044 W/mK, making it suitable for reducing heat loss and improving energy efficiency in homes. This product also boasts good acoustic properties, excellent fire safety with an A1 fire rating, and is vapour permeable and breathable. The insulation has a thickness of 200mm and covers an area of 6.03m2.