Where are multiple layers of drywall typically found?

Multiple layers of drywall are commonly found in elevator shafts due to fire safety regulations and soundproofing requirements. Elevator shafts often require additional fire protection to prevent the spread of fire between floors, and multiple layers of drywall help achieve this by providing greater fire resistance. The thickness and layering of the drywall contribute to the overall structural integrity and safety of the elevator system.

In contrast, while other areas like bathrooms, lobbies, and break rooms may have drywall, they typically do not require the same level of fire protection or soundproofing as elevator shafts. This makes the use of multiple layers in those locations less common or unnecessary. Thus, elevator shafts stand out as the primary area where multiple layers of drywall are utilized in commercial construction.