Which material is more likely to resist fire and slow the spread?

• A. Masonry walls
• B. Wood-framed walls
• C. Gypsum board
• D. Steel studs

Answer: (A)

Massive masonry walls resist fire and slow spread because they are noncombustible and have substantial heat-absorbing mass. Their dense construction delays heat transfer, maintains structural integrity longer, and acts as a strong fire barrier between spaces. In contrast, wood-framed walls use combustible wood, which can ignite and feed the fire, allowing quicker spread. Gypsum board provides some fire resistance but only for a limited duration and is not as effective a barrier as solid masonry. Steel studs don’t burn, but they can lose strength and stability under high heat, risking collapse unless they’re adequately protected. So masonry walls offer the best combination of fire resistance and slowing of fire spread.