50mm Thermal Rockwool Rockfloor Insulation Slab is a tissue faced, high compressive dual density insulation slab made from mineral stone wool, and meets Part L Building Regulations in ground floors, and for acoustic applications, meets Building Regulations Part E, in intermediate and separating floors. Due to its dual density structure, it can be laid over slightly uneven floors -- the lower density absorbs imperfections and the high-density top layer layer provides a strong point load resistance. The Rockfloor slab is an economical solution for conserving heat in dwellings.

Rockfloor slabs should be laid lengthways to the longest wall, in a staggered joint pattern, tissue face upwards. The off cut at one end of the first row is then used to start the next row and similarly with subsequent rows.