What type of materials are classified as PACM?

The classification of PACM, which stands for Presumed Asbestos-Containing Materials, specifically refers to materials that are commonly known to contain asbestos based on their type and the period when they were installed. The most pertinent types of materials classified as PACM are thermal system insulation and surfacing materials. This encompasses a wide range of products that were typically used in construction and building maintenance before the use of asbestos was heavily regulated, particularly in the mid to late 20th century.

Thermal system insulation is designed to insulate pipes, boilers, and other components to prevent heat loss or gain, while surfacing materials often involve drywall, plaster, or spray-on materials used for fireproofing, soundproofing, or aesthetics. Both of these categories have a higher likelihood of containing asbestos.

In contrast, the other options do not accurately reflect the broad spectrum of materials classified as PACM. While floor tiles and spray-applied coatings can sometimes contain asbestos, they fall under further scrutiny and testing for confirmation rather than being classified directly as PACM. The classification of all insulation materials is too broad, as not all insulation contains asbestos, especially newer materials. Thus, the correct answer focuses on the specific categories known to be predominantly composed of asbestos, solidifying