The type of construction that presents the most hazard due to use of plywood I-beams is:

The type of construction that presents the most hazard due to use of plywood I-beams is:

• A. Type I
• B. Type V
• C. Type III
• D. Type II

Answer: (B)

In wood-frame construction, the fire hazard is tied to how quickly the structural members burn and fail. Plywood I-beams are an engineered wood product used in light-frame Type V construction. Their flame exposure leads to rapid ignition and loss of strength because the wood and the plywood web fire together and can delaminate under heat. That quick degradation means floors or roofs can collapse with little warning, trapping firefighters and enabling the fire to spread more rapidly behind walls and ceilings. Other construction types rely more on noncombustible or fire-rated materials—noncombustible exterior and structural members, or fire-resistive assemblies—which slow flame spread and give more time for suppression. While any fire in a Type III or Type II building is dangerous, the combination of lightweight framing and plywood I-beams in Type V makes it the most hazardous in this context.

In wood-frame construction, the fire hazard is tied to how quickly the structural members burn and fail. Plywood I-beams are an engineered wood product used in light-frame Type V construction. Their flame exposure leads to rapid ignition and loss of strength because the wood and the plywood web fire together and can delaminate under heat. That quick degradation means floors or roofs can collapse with little warning, trapping firefighters and enabling the fire to spread more rapidly behind walls and ceilings.

Other construction types rely more on noncombustible or fire-rated materials—noncombustible exterior and structural members, or fire-resistive assemblies—which slow flame spread and give more time for suppression. While any fire in a Type III or Type II building is dangerous, the combination of lightweight framing and plywood I-beams in Type V makes it the most hazardous in this context.