Which construction feature used in some factory-built homes is susceptible to early failure in a fire?

• A. Bow truss systems
• B. Lightweight building material
• C. Glue-laminated elements
• D. Small-dimensioned lumber

Answer: (B)

Lightweight construction in factory-built homes carries less heat-absorbing mass, so these members heat up and lose strength more quickly than heavier, traditional framing. Engineered components often use adhesives and laminates that can degrade at relatively low temperatures, causing structural elements to fail sooner in a fire. Because of this, roof and wall assemblies made with lightweight materials are at higher risk of early failure, creating a rapid shift from growth to collapse potential. For a fire officer, this means recognizing the vulnerability of these assemblies during size-up and when planning an attack, often favoring defensive operations sooner to protect crew safety.