Masonry construction can collapse in one piece or crumble.

• A. One piece or crumble
• B. Shatter into fragments
• C. Break apart
• D. Fail gradually

Answer: (A)

Understanding how masonry fails helps firefighters anticipate collapse and choose safe tactics. Masonry construction can fail in two common ways: as a single piece or crumble. A collapse that happens in one piece means the wall or section lets go and drops as an intact unit, often because of a sudden loss of support or a critical bond failure. Crumbling describes the wall breaking down into smaller pieces or rubble, usually as mortar deteriorates or the units detach gradually under load. The other options don’t fit these typical patterns: shattering into fragments implies a glass-like break that masonry doesn’t usually do; breaking apart is too vague and doesn’t capture the distinct single-mass vs. crumbling behavior; failing gradually suggests a slow, progressive failure rather than the abrupt modes described.