Which of the following materials is considered Presumed Asbestos Containing Material (PACM)?

Presumed Asbestos Containing Material (PACM) refers to materials that are assumed to contain asbestos unless proven otherwise, typically due to their age or the context in which they were used. Older floor tiles fall into this category because they were commonly manufactured using asbestos until regulations were tightened in the late 1970s. Therefore, if a building has older floor tiles, they are presumed to contain asbestos unless a thorough inspection or testing demonstrates otherwise.

In contrast, newly installed ceiling tiles and asbestos-free drywall are not considered PACM since they were installed after asbestos regulations were enacted and are specifically certified as safe. Known asbestos insulation is recognized for containing asbestos, removing it from the PACM category and placing it in the definitive category of asbestos-containing materials. Thus, older floor tiles are correctly classified as PACM due to the historical use of asbestos in their production and the need for caution in handling them in renovation or demolition activities.