 
        Depending on how old the insulation is, it could contain asbestos or other harmful materials and would require specialized removal techniques. Asbestos is a mineral fiber. It can be positively identified only with a special type of microscope. There are several types of asbestos fibers. Insulation dating from the 1930s through 1950s could contain asbestos, so it is a good idea to have a specialist check things out if you are concerned. If disturbed, asbestos material may release fibers, which can be inhaled into the lungs.