Isover Spacesaver Attic Insulation G3 is a pre-perforated insulation roll designed for use in attic flooring with either 400mm or 600mm centre joists. It helps reduce heat loss and improve energy efficiency in homes, thanks to its good thermal performance and acoustic properties. This product also features excellent fire safety, with an A1 fire rating, and is vapour permeable for breathable insulation. The insulation roll has a thickness of 150mm and covers an area of 9.34m2.