Roof slab PAROC ROS 30 is non-combustible stone wool insulation for use as a load bearing thermal insulation layer of existing and new flat roofs. The roof insulation slab is developed to provide sustainable, hard and fire safe bedding for rigid top insulation layers as well as insulating the bearing layer in renovation sites. The suitable roof slab for flat roof will be chosen based on the product's mechanical properties and thermal conductivity. The compressive stress of PAROC ROS 30 is 30 kPa, which means that the slab can carry a 3000 kg/m2 load during installation and use. This means that it is suitable for normal level loads.