Which type of construction presents the most hazard due to the use of plywood I-beam?

Type 5 construction is characterized by its use of lightweight materials, including plywood I-beams, which are commonly used in framing. These materials can pose significant hazards during firefighting operations because they are prone to rapid failure when exposed to heat. Plywood I-beams often offer a high strength-to-weight ratio, which can deceive firefighters into believing a structure is more stable than it actually is. When subjected to fire, these beams can lose structural integrity quickly, leading to potential collapse and putting firefighters at increased risk.

In contrast, other construction types such as Type 1, Type 3, and Type 4 incorporate heavier and more fire-resistant materials, which typically offer better resilience in fire scenarios. For example, Type 1 construction is made of non-combustible materials and is the most fire-resistant, making it less hazardous than Type 5. Remembering the distinctions in construction types helps in assessing risks during firefighting operations and in determining the best strategies to ensure safety.