Rockwool Slab 10 Insulation. This product is a high-density rock wool insulation slab. It is perfect for use in a variety of applications including thermal insulation and soundproofing. This is a new product with full technical specifications and documentation for building professionals. The dimensions are 1000mm x 600mm x 190mm and it has a thermal conductivity of 0.035 W/mK. This pack contains 5 slabs, each measuring 1.2m.