Which construction type presents almost unlimited potential for fire extension?

Type V Construction presents almost unlimited potential for fire extension primarily due to the materials used and the inherent characteristics associated with this construction type. Structures classified as Type V are typically constructed with entirely wooden framing, which is highly combustible. The use of wood studs, beams, and joists allows fire to spread rapidly throughout the building, especially when there are open spaces and limited fire barriers.

In Type V construction, the absence of non-combustible and fire-resistant materials further facilitates fire's progression. Factors such as attic spaces, voids, and the arrangement of interior materials can contribute to creating a pathway for flames to travel. Consequently, the structural integrity can be compromised quickly, leading to catastrophic fire spread.

In comparing this with other construction types, Type I is characterized by fire-resistive materials like concrete and steel, which are designed to limit fire extension. Type II also utilizes non-combustible materials but may still have areas of vulnerability that mitigate potential spread. Type III incorporates both combustible and non-combustible materials but is generally considered more resistant to fire than Type V. Meanwhile, Type IV combines heavy timber construction, which has better fire-resistance properties compared to lightweight wooden framing. Thus, the unique features of Type V Construction make it