Structure triage classifies structures based on what factors?

• A. Fire behavior, location, construction, and adjacent fuels
• B. Water supply, access, and civilian presence
• C. Roof material, siding, and landscaping
• D. Proximity to roads and utilities

Answer: (A)

Structure triage centers on four factors that determine how likely a structure is to ignite and how hazardous the exposure is to firefighters. First, fire behavior around the structure—how intense the flames are, how fast the fire is spreading, and whether embers are being carried by wind to ignite the structure. This tells you how quickly conditions can change and where the greatest ignition risk comes from.

Second, location on the landscape—where the structure sits relative to the fire front, terrain, wind direction, and surrounding fuels. A structure on a slope or in the path of the fire with nearby fuels is more at risk than one in a cleared, protected setting.

Third, construction of the structure—how resistant it is to ignition, including materials, roof type, vents, and overall ignition potential. More fire-resistant construction with proper ember protection reduces the chance of ignition.

Fourth, adjacent fuels around the structure—what flammable materials and vegetation are immediately nearby, and how well defensible space is maintained. Dense or continuous fuels close to the structure raise the risk of ignition from radiated heat or embers.

Together, these factors help determine the level of risk and guide decisions about whether to defend, prepare the structure, or release it to burn. Other elements like water supply, access for crews, or nearby civilian presence are important for operations, but they do not form the primary basis for triage classification.