Asbestos is a natural mineral made up of microscopic fibers that are heat-resistant, durable, and non-conductive of electricity. It used to be a popular material for commercial and residential building construction before the health risks associated with it were discovered. Common asbestos-containing materials (ACMs) include:

• Felt roofing
• Vinyl floor tiles
• Ceiling tiles
• Corrugated cement roof sheets
• Insulation boards
• Textured coatings, such as Artex

It's important to note that not all materials containing asbestos are unsafe. ACMs are only hazardous when they are disturbed, causing the asbestos fibers to become airborne and inhaled, which can lead to serious health problems.