What is a major fire concern regarding Type II construction?

In Type II construction, which often involves non-combustible materials such as steel and concrete, a significant fire concern arises from the behavior of these materials under extreme heat. Steel, while it is not combustible, loses its structural integrity and strength when exposed to high temperatures. When a fire occurs, the steel can reach critical temperatures that lead to a dramatic decrease in its ability to support loads. This phenomenon can result in structural failure, posing hazards to life safety and property.

Thus, the concern centers around the performance of the structural framework during a fire event, particularly how the content fire—such as furnishings and equipment—can generate flames and heat that impact the steel. The possibility of flame strike, where flames directly contact the steel, exacerbates this concern, as prolonged exposure can lead to quick degradation.

In contrast, the other options primarily focus on elements such as the presence of combustible materials, flame spread to wooden structures, or insulation effectiveness, which while important in fire safety, do not capture the primary risk associated specifically with Type II construction methods. Understanding the relationship between fire conditions and steel performance is essential for effective fire prevention and structural design in these types of buildings.