Which circumstance does NOT typically require wet methods in asbestos abatement?

In asbestos abatement, the use of wet methods is primarily to minimize the release of asbestos fibers into the air. These methods involve wetting asbestos-containing material to stabilize it, thus reducing potential exposure during removal or disturbance.

The circumstance where less than 25 square feet of material is involved does not typically require the use of wet methods because, under certain regulations and guidelines, smaller amounts of asbestos may be managed using dry or alternative methods without the same stringent requirements for fiber suppression. This exception exists as smaller areas are often considered low-risk for significant fiber release compared to larger contaminated areas.

In contexts involving high humidity, the application of wet methods can be unnecessary due to the already prevalent moisture in the environment, which may aid in fiber control. When heavy equipment is present, the potential for fiber disturbance increases, thereby necessitating wet methods for safety. The presence of visible airborne fibers strongly indicates a situation that requires wetting techniques to control fiber release. Therefore, less than 25 square feet stands out as a circumstance that typically allows for alternative approaches to wet methods in asbestos abatement procedures.