The Rockwool Rockfloor Acoustic Floor insulation is a great insulation for ground floors and separating floors. It can be installed underneath or on top of the load bearing slab. It offers fantastic acoustic dampening. The Rockwool Rockfloor really is a unique product. Typically used in apartments and flats it really helps in reducing noise. The Rockwool Rockfloor is sold in a variety of thicknesses from 25mm, 30mm & 50mm.