In what situation is enclosure most commonly used?

Enclosure is most commonly used when immediate removal of asbestos-containing materials is not feasible. This approach is employed as a temporary control measure to prevent the release of asbestos fibers into the air while a more permanent solution, such as removal, is planned or scheduled. Enclosure involves constructing airtight barriers around the material to contain it and minimize exposure to individuals in the vicinity.

This method allows for the continued use of a building or area while ensuring that hazardous materials do not pose a risk to health. Enclosure is often chosen in situations where time constraints, safety concerns, or logistical challenges prevent immediate removal. It serves as a practical interim solution until a safe and effective abatement can be arranged.

In contrast, the other options do not typically necessitate the use of enclosure as a primary method. For instance, if asbestos is undetectable, it may not warrant enclosure since the risk cannot be assessed accurately. Similarly, if safety equipment is unavailable, alternative measures might need to be considered rather than simply enclosing asbestos. Lastly, in a demolition scenario, removal is often prioritized to eliminate hazards before any structural work occurs, making enclosure less common in that context.