When should a collapse zone be established at a fire incident?

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A collapse zone is a safety perimeter created around a building when there is a real risk of structural failure, so that debris from a collapse does not injure firefighters or bystanders. The best time to establish this zone is when a defensive strategy has been adopted. At that point, crews are operating from the outside to contain the fire and protect exposures, and interior entry is not being pursued. Setting up the collapse zone ensures everyone outside stays well clear of potential collapse debris and gives responders a clear, safe area to work from if the building gives way.

If you’re still pursuing interior operations or an offensive attack, the immediate needs and safety measures inside the structure take priority, and the trigger for a collapse zone isn’t the same. Distances for the zone are based on building height and configuration, and should be established and communicated early as conditions dictate.