Asbestos is a naturally occurring mineral that comes in six different forms and is made up of fibres up to 200 times thinner than human hair. When it comes to asbestos in homes, not all types are as equally dangerous to humans but most can be found within any domestic building built before 1990. Each type of asbestos comes with certain precautionary measures that should be carefully considered. For the purpose of this article, only the types of asbestos commonly used in construction and therefore subject to an asbestos risk assessment, will be outlined.

Asbestos only becomes harmful to health when the fibres become disjointed from building material and are inhaled into the body (usually through the lungs). The best way to define asbestos is according to the specific level of danger it presents and the nature of its use.