What material is considered TSI in buildings constructed before 1980?

Thermal System Insulation (TSI) refers to materials used to insulate heating and cooling systems, piping, and ducts to enhance energy efficiency and prevent heat loss or gain. In buildings constructed before 1980, it is common for TSI to contain asbestos due to the material's effective insulating properties. Asbestos was frequently used in thermal insulation products during this period.

Understanding TSI is vital for safety and health considerations in renovating or maintaining older buildings, as disturbance of these materials can release hazardous asbestos fibers into the air. This significance is underscored by the regulatory framework established to protect workers and building occupants from asbestos exposure.