What is the main problem with Type V construction?

Type V construction, often referred to as wood-frame construction, is characterized by its extensive use of combustible materials, particularly wood. The primary concern with this type of construction is the presence of extensive combustible voids within its structure. These voids can occur in walls, floors, and roofs and can make the framework susceptible to rapid fire spread. When a fire ignites in a Type V building, it has the potential to spread quickly through these concealed spaces, making it difficult for firefighting efforts to reach and control the fire effectively. This design approach can significantly impact the structure's overall fire safety, necessitating careful attention from firefighters and emergency responders.

The other options, while they may have some relevance in the context of building safety and fire prevention, do not capture the essence of the most pressing issue associated with Type V construction. Specifically, the use of metal components (which are more relevant to Types I and II), limited structural support (which can vary depending on design and engineering standards), and inadequate fire barriers (which could apply to various construction types) do not directly relate to the fundamental problem posed by the combustible voids in Type V buildings.