How is damaged friable surfacing ACM characterized?

Damaged friable surfacing Asbestos Containing Material (ACM) is characterized primarily by its physical condition, which includes visible injuries such as flaking, cracking, or signs of moisture damage. This type of damage indicates that the material has deteriorated, making it more likely to release asbestos fibers into the air when disturbed. This is crucial as friable ACM is defined by its ability to crumble easily and release fibers, posing a higher risk for exposure.

In the context of the other options, a smooth exterior does not signify damage but rather that the material may still be intact and less likely to cause fiber release. Reinforcement typically suggests an improvement in the material's structural integrity, thereby reducing the friability. Lastly, the presence of asbestos fibers is a fundamental characteristic of friable ACM, so stating that it contains no asbestos fibers contradicts the definition of what constitutes friable ACM. Therefore, option C accurately captures the essential characteristics of damaged friable surfacing ACM, reflecting the risks associated with its integrity and condition.