Under what circumstance is sampling of thermal insulation not necessary?

Sampling of thermal insulation is not necessary if the insulation is fiberglass. This is because fiberglass is not classified as an asbestos-containing material (ACM). Under regulatory guidelines, materials that do not contain asbestos do not warrant sampling for asbestos presence. Therefore, when dealing with thermal insulation that is clearly identified as fiberglass, there's no need for testing to determine asbestos content.

Other conditions, such as whether the insulation is damaged, its length, or its location, do not necessarily exempt it from sampling, particularly if there is a potential for asbestos fibers to be present in the material in question. Thus, recognizing fiberglass as a non-asbestos material is key to understanding why sampling is not required in this scenario.