Which construction type is primarily concerned with fire spread through concealed spaces?

Type III Construction is primarily concerned with fire spread through concealed spaces due to its inherent design characteristics. This construction type typically involves exterior walls constructed of non-combustible materials, while the interior elements, such as framing and floors, are often made from combustible materials like wood. The presence of concealed spaces, such as those found within walls and ceilings, creates pathways for fire and smoke to travel undetected, increasing the risk of rapid fire spread throughout the structure.

Understanding that Type III buildings often have hidden voids or cavities is crucial in identifying the potential fire hazards associated with this construction type. Firefighters and building inspectors focus on these concealed spaces during fire prevention and safety measures, as they can significantly affect how quickly and where a fire spreads within the building. This emphasis on managing fire spread in concealed spaces is a defining feature of Type III Construction, distinguishing it from the other types, which may have different material characteristics and fire safety concerns.