Which construction type typically leads to the fastest spread of fire due to its components?

Lightweight construction typically leads to the fastest spread of fire primarily due to its component materials and design. This type of construction often incorporates materials like wood trusses and engineered wood products, which can burn quickly and lose structural integrity at lower temperatures compared to heavier materials. The overall design of lightweight buildings, which may feature open floor plans and large concealed spaces, can facilitate rapid fire spread by allowing flames and heat to move easily through these areas.

Moreover, the potential for early failure of lightweight structural components, such as trusses and beams, means that fires can escalate more rapidly, presenting significant challenges for firefighting efforts. As these components are designed to be cost-effective and lightweight, they inadvertently create hazards during a fire scenario that can lead to faster fire growth and spread compared to more robust construction types like masonry, steel frame, or heavy timber.