Acquired Structure Burn: Permit Missing, Roof Questionable
You are the safety officer for a live-fire training exercise using an acquired single-family dwelling. The structure was built in 1958, has a lightweight truss roof over the addition, and a basement. A structural engineer's report is two years old and notes 'no obvious deficiencies' but recommends a re-evaluation if the building has been unoccupied for more than 12 months. It has been vacant for 26 months. The weather forecast is 18°F with 15 mph wind; the hydrant is 900 feet away and flows 1,100 gpm. Twenty-four students and six instructors are assigned. NFPA 1403 requires a pre-burn plan, a safety officer, and a backup line. One instructor asks to skip the pre-burn walkthrough because 'we've done this house before.' The AHJ has not yet issued the burn permit. What do you do?
1. Should you authorize the live-fire exercise as planned? Identify the specific conditions that must be met before any ignition.
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Do not authorize ignition as planned. The conditions are not met: the structural report is two years old and the building has been vacant for 26 months, which triggers the report's own re-evaluation recommendation; the addition has a lightweight truss roof, a known collapse risk; the AHJ permit has not been issued; and an instructor wants to skip the pre-burn walkthrough. Before any ignition, require a current structural evaluation by a qualified person, a valid burn permit, a completed pre-burn plan and walkthrough with all participants, confirmation of water supply and backup line, and a safety briefing. Verify the 900-foot lay actually delivers the needed flow after friction loss; 1,100 gpm at the hydrant is not 1,100 gpm at the nozzle. If any item cannot be met, postpone. Safety officer authority includes stopping the exercise.
2. What compliance and safety documentation must exist before, during, and after the burn?
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Before the burn: AHJ permit, current structural report, pre-burn plan, site walkthrough sign-in, weather forecast, water supply test, instructor qualifications and student-to-instructor ratios, JHA, emergency evacuation plan, and apparatus staging. During: safety officer log, ignition and fire behavior records, backup line charged, accountability, entry control, and stop-work authority. After: post-burn critique, injury/exposure reports, apparatus and equipment check, and training records for all participants. Include OSHA respiratory protection and live-fire training requirements, NFPA 1403, and local AHJ rules. Retain the permit, plan, attendance, and critique per records retention. If the burn is canceled, document the reason and the safety decision; that is also a record.
3. How should you handle the instructor who wants to skip the walkthrough and the 900-foot water supply concern?
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Refuse the shortcut clearly and in writing if needed: the pre-burn walkthrough is not optional because the building has changed since the last use, the roof is a lightweight truss, and the permit is not issued. For water, calculate friction loss for the 900-foot lay and required nozzle flow; if a relay or tanker shuttle is needed, test it before ignition or reduce the evolutions. If the instructor persists in bypassing safety controls, remove that instructor from the live-fire safety role and refer the conduct to the training chief for coaching or discipline under policy. Do not make it personal; frame it as a compliance decision. Document the interruption, the reason, and the corrective actions. A canceled or delayed burn is cheaper than a collapse or a failed water supply.