ROCKWOOL ceilingrock is a stone wool slab which provides thermal , acoustic insulation and fire safety.It is used  for ceilings in non-heated spaces like cellars or garages, one side sheathed with increased hardness special glass mat and water repellent throughout the whole section. For mounting without an additional substructure, directly to the ceiling, with mechanical fastening. Like all Like all ROCKWOOL products it protects against fire; provides acoustic comfort due to its fibrous structure; is uniquely durable against all forms of weather and is only sourced from sustainable materials.