Liquids Versus Melted Solids. Fire Patterns (1 of 2) • Visible or measurable physical changes, or identifiable shapes, formed by a fire effect or group of fire effects • Three basic causes: – Heat – Decomposition – Consumption 4 Fire Patterns (2 of 2) • Analyze fire patterns within the context of all the patterns. fire pattern, affecting the actual shape of the lines of demarcation displayed, or increasing or decreasing the amount of pyrolysis and combustion in different areas. a mixed fire regime of infrequent, high intensity crown fires and periodic low intensity surface fires. For more information, contact: FIRE PATTERN ANALYSIS Gerald Haynes, PE Fire Protection Engineer Forensic Fire Analysis, LLC 20th Annual Fire Investigative Approaches Training Seminar Myrtle Beach, SC October 20, 2016 . Evidence of both types of fire can be seen within the Hourglass perimeter. The correct term for this fire pattern is an irregularly shaped fire pattern. ... V Patterns Hourglass Patterns Fire Plume Damage Correlations 3.1 FIRE PLUMES . The following indicators were present when this pattern was excavated that helped to establish that this pattern resulted from an ignitable liquid pour and was not caused by falling, burning debris or from a flashover effect: 1. Many plastic materials will burn. When the winds increased due to passage of the dry cold front on July 1, the surface fire was propelled into the The presence of an ignitable liquid should be confirmed by laboratory analysis. Structural damage inconsistent with fire loading. 2.3.3 Interior Fire Scene Examination 2.3.4 Fire Patterns or Fire Indicators 2.3.4.1 V and Hourglass Patterns 2.3.4.2 Lines of Demarcation 2.3.4.3 Low Burns and Penetrations 2.3.4.4 Charring 2.3.4.5 Clean Burn 2.3.4.6 Trailers and Pour Patterns 2.3.4.7 Scene Documentation 2.3.5 Forensic Analysis 2.3.6 Fire Cause Classification 2.3.6.1 Accidental Around the late 1970’s there was a movement within the profession to describe fire patterns by descriptions of their geometric shapes (e.g. analysis methodology suggests that the classic V thermal damage pattern is used by analysts to determine the origin of the fire, the base of the V being the likely origin of the fire. If the fire is stopped before the fire reaches the ceiling, an inverted "V" pattern may remain for fire investigators. The determination of the mature of an irregular pattern should not be made by visual interpretation of the pattern alone.

2. Director, Fire Investigation Specialist American Re-Insurance. As the fire progresses, the hourglass pattern becomes a common "V" pattern. V-pattern, U-pattern, hourglass-pattern). For example, if both smooth and rough surfaces of the same material are equally exposed to the same This pattern is not an accurate indicator of an accelerant, or arson. The damage that forms the shape of the V can be a result of soot deposition, direct flame