What is largely the concern regarding fire loads in Type IV construction?

In Type IV construction, the primary concern regarding fire loads stems from the large spans between walls. This construction type is characterized by the use of heavy timber and is often referred to as "ordinary construction." The large spans can create open spaces that, while structurally beneficial, also allow for the rapid spread of fire across substantial areas. When a fire occurs, these expansive areas can lead to a greater accumulation of combustible materials and fuel sources, which in turn increases the potential for higher fire loads and more severe fire behavior throughout the building.

The design features associated with Type IV construction may leave areas more susceptible to fire spread, as the heavy timber elements may burn and weaken, leading to structural failure if not properly managed. Understanding these concerns is crucial for fire prevention and safety measures in buildings constructed using this method. This context is integral to effective firefighting strategies and ensuring protection for both occupants and firefighters.