Rockwool Sound Insulation Slab 1200 x 400 x 100mm (2.88m2)Experience unparalleled acoustic and fire performance with Rockwools Sound Insulation Slabs. Quiet Mark approved, these slabs offer exceptional soundproofing for internal and separating walls. Featuring the highest Euroclass fire rating of A1, they provide superior fire resistance while remaining water repellent and vapour permeable. Designed to resist rot and mould, these slabs are also easy to cut and fit, thanks to their patented FLEXI Edge.