In pre-incident planning, which exterior cues help identify the construction type?

• A. Interior layout and room dimensions
• B. Exterior materials, roof type, visible structural elements, and presence of firewalls
• C. Occupant density and egress routes
• D. Color of exterior paint only

Answer: (B)

Exterior cues observed during pre-incident planning are the most reliable way to infer a building’s construction type from the outside. The materials visible on the exterior tell you what the structure is made of—brick or masonry, concrete, protected steel, or wood—each bringing different fire resistance and failure characteristics. The roof type offers clues about the overall construction approach and whether there are concealed spaces that could drive fire spread or compromise roof integrity. Visible structural elements, such as exposed steel beams, columns, or timber trusses, reveal the system the building relies on and indicate where hidden loads or vulnerabilities might exist. The presence or absence of firewalls signals compartmentalization within the building, which affects how fire might be contained and how it will influence ignition points and ventilation decisions.

Interior layout, room dimensions, occupant density, and egress routes require entry or detailed surveying and do not reliably indicate construction type from the outside. Exterior paint color likewise doesn’t reveal structural composition. So, combining exterior materials, roof type, visible structural members, and firewalls provides the best exterior clues for identifying construction type before entering the building.