Which type of wall is more susceptible to faster fire growth due to its tendency to burn and weaken quickly?

• A. Masonry walls
• B. Steel framed firewall
• C. Wood-framed walls
• D. Concrete walls

Answer: (C)

Wood-framed walls are more susceptible to faster fire growth because wood is a combustible material that provides substantial fuel. When a fire reaches these walls, the studs, sheathing, and interior finishes can rapidly feed flames, increasing heat release and speeding flame spread. As the wood burns, it loses structural strength quickly, allowing the wall to weaken and fail sooner. In contrast, masonry and concrete walls are noncombustible and do not supply fuel for the fire, and steel components don’t burn (though they can weaken at high temperatures). This is why wood-framed walls tend to permit faster fire growth and earlier structural compromise.