Insulation on the underside of roofs and sometimes sides of buildings and warehouses. Also used as fire protection on steel and reinforced concrete beams/columns and on underside of floors.
It was very easy to overspray or get a 'splash back' from the equipment used to apply this so there is likely to be debris around the sprayed area.
Usually white or grey in colour with a rough surface, although they may have been painted.
This contains up to 85% asbestos and breaks up very easily. It is one of the most dangerous materials containing asbestos. Even minor disturbance of sprayed coatings can release large quantities of asbestos fibres into the air where they can be breathed in.
Do not attempt to work on this material under any circumstances unless you are a HSE-licensed contractor.