Which collapse classification corresponds to light-frame partition collapse?

• A. Basic
• B. Moderate
• C. Light
• D. Heavy

Answer: (C)

Light-frame partition collapse is categorized as light collapse because the failure involves interior, non-loadbearing elements rather than the building’s primary structural system. Interior partitions built with light wood framing and drywall can give way under fire conditions, creating a localized collapse and debris, but the main beams, columns, and structural supports remain intact and stable. This keeps the overall integrity of the structure, and the danger is confined to the immediate area of the collapsed partition rather than signaling widespread structural failure.

In contrast, a moderate or heavy collapse would involve failure of structural components—such as beams, columns, or large floor/roof sections—leading to a greater risk of ongoing collapse and broader instability. Basic collapse would imply little to no collapse of structural components, with minimal observable failure.