vermiculite insulation

Vermiculite insulation is a type of loose, lightweight material made from expanded mineral flakes. When heated, the mineral expands into bubble-like shapes, creating a natural, fire-resistant insulation that traps air to reduce heat transfer. It’s often used in attics and wall cavities to improve energy efficiency. Historically, some vermiculite insulation contained asbestos, which can pose health risks, so it's important to test for asbestos if the material is old. Overall, vermiculite provides effective thermal insulation, but safety considerations depend on its specific composition.