CRIM 451 Lecture 3: Week 3 Fire Investigations

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Fire patterns: are the visible effects of thermal energy on materials that remain after a re has been extinguished. Types of fire patterns: movement patterns, heat patterns. Fire burns up and out look for a v" pattern. To understand re patterns, you need to understand re behaviour. Fire development: stages, ignition: ignition describes the period when the four elements of the re tetrahedron come together and combustion begins. Backdraft indicators: puf ng smoke, yellow-tray smoke, walls too hot to touch, dull orange glow or visible re, darkened windows, rattling windows. Week 3: forensic fire investigations: damage by, flame, radiant heat, hot gases and, smoke. Physical effects: charring, oxidation (rusting, distortion, melting, colour changes, structural collapse. Factors affecting fire patterns: structures, ignition factors, ventilation, fuel load, air ow, others. Indicators: smoke / soot, lines of demarcation, glass it will get a lm on it, clean burns, furniture, v patterns, liquid pour patterns, trailer, melted materials.

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