Vacant Warehouse Fire Threatening an Occupied Apartment
At 15:40, a four-story vacant brick warehouse is burning with fire through the roof. A 25 mph wind pushes smoke and embers toward a 40-unit occupied apartment building 12 feet away. The incident commander sets a defensive strategy, but a crew leader requests permission to enter with a 2½-inch line to stop extension into the exposure. The ISO observes a cracked parapet, a bowing east wall, and visible fire in the attic. There is no savable life inside the vacant warehouse; the apartment building has not yet been evacuated. Only two aerials are on scene, and the water supply is from a hydrant 800 feet away. The crew leader argues that property conservation and the exposure justify an interior attack. The IC asks the ISO for a risk-benefit recommendation while residents are still moving out.
1. Apply risk-benefit analysis to decide whether the ISO should support the interior attack or a defensive strategy.
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Risk-benefit analysis. Risk management compares the risk to be taken with the value to be gained. There is no savable life in the vacant warehouse, and the building has already failed defensively: fire through the roof, a cracked parapet, a bowing wall, and an attic fire in a brick shell. The expected gain from an interior attack is property protection only, and the probability of collapse or wall failure is high. That fails the risk-benefit test. The 40-unit occupied apartment 12 feet away is a savable exposure and changes the plan: protect it with heavy streams, aerials, and evacuation, not by sending a crew inside the vacant building.
Tactical direction. The ISO should support a defensive strategy, recommend immediate evacuation of the exposure, establish a collapse zone at least 1.5 times the wall height, and keep apparatus and personnel out of the zone. Place aerial streams to protect the exposure and wet down the east wall from outside. If the crew leader still wants an interior line, the ISO should explain that the line would place firefighters under a falling wall with no life-safety benefit.
Safety integration. The ISO should ensure the incident action plan or tactical worksheet lists the collapse zone, exposure evacuation, water supply, accountability, and a safety message. Document the recommendation, the IC decision, and any dissenting view. Reassess the parapet continuously; if the wall bulges further, withdraw all personnel from the collapse zone.
2. What safety actions and documentation should the ISO require if the IC adopts the defensive strategy?
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The ISO should confirm that evacuation of the apartment building is underway, with a designated evacuation group and a safe refuge area. Establish a collapse zone based on the full wall height plus a margin, and mark it with tape or apparatus placement so crews do not drift into it. Ensure aerial streams are positioned outside the collapse zone and that the water supply is adequate for master streams. Assign a collapse observer if staffing allows, and set a trigger for withdrawal if the east wall moves or the parapet cracks widen.
The safety message in the incident action plan should state the collapse zone, the exposure evacuation status, the defensive strategy, and the no-entry rule for the vacant building. Document the time of the risk-benefit decision, the IC's order, and any crew leader dissent. If the crew leader continues to argue, the ISO should repeat the hazard and let the IC enforce the order. Post-incident, include the wall condition and evacuation timeline in the critique so the department can review its exposure-protection decisions.