Size Rolls Per Pack Pack Coverage 25mm x 11.1m x 4/600mm 4 26.64m2 50mm x 13.5 x 2/600mm 2 16.2m2 75mm x 14.5m x 2/600mm 2 17.4m2 100mm x 10.3m x 2/600mm 2 12.36m2 This Knauf acoustic roll is part of the Knauf acoustic insulation range and provides a high level of sound absorption, whilst also improving the thermal and fire performance of the wall, floor or partition. Using glass mineral wool as a sound absorbent layer in partitions and floors significantly improves their acoustic performance, whilst only adding minimally to the overall mass of the structure. In partitions glass mineral wool complements the plasterboard linings by absorbing airborne sound in the cavity and reducing reverberation, it is particularly effective at preventing the hollow sound that can occur in partitions with unfilled cavities.