How do firemen know the cause of a fire after everything has burnt down?

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Often times you hear about the cause of a fire being a cigarette for example. However, isn’t the cigarette already long gone after the house/forrest/etc. has burnt down? How is it still possible find out what started the fire?

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Anonymous 0 Comments

I took fire investigation, albeit for wildland fires. Most often fires don’t entirely incinerate the scene. In fact the fire is usually burning LESS intense at it’s point of ignition making the location of the start easiest to investigate. One can reconstruct the fire in many ways often by gauging the intensity of the burn which tells investigators how fast it was moving, if fuels were left behind, whether it had enough ventilation, if there were accelerants. You can often determine the direction of the fire’s movement based on soot deposits which remain on one side of a wire/fence and not the other.

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