Reading the Pre-Plan
You are reviewing a pre-plan for a garden-style apartment complex. The document states: "Building C is a three-story, wood-frame structure with 24 units. Access is from the north parking lot only; the south side is a retaining wall 8 feet high. Standpipes are located at each end of the building. The attic is a continuous common space running the full length of the building with no fire stops. Occupancy load is estimated at 60."
A later paragraph notes: "Building C was re-roofed in 2019 with a lightweight truss system. The original 1970s roof was conventional lumber." The pre-plan's "Hazards" section still lists only "cooking fires" and does not mention the roof.
1. What does the pre-plan tell you about vertical fire spread in Building C, and how should that shape strategy?
Read the worked answer
Two details matter. First, the attic is a continuous common space with no fire stops, so fire that reaches the attic can run the full length of the building unchecked. Second, the 2019 lightweight truss roof means the roof can fail suddenly under fire conditions with little warning. Together, these mean vertical spread into the attic is the dominant life-safety and structural risk.
Strategy: prioritize stopping fire before it reaches the attic, ventilate or open up only with an understanding of the truss layout, and do not place crews on the roof of a lightweight truss building that has been burning long enough to affect the trusses. Defensive posture should be considered earlier than for a conventional roof.
2. The Hazards section omits the roof change. Why is that a problem, and what should you do about it?
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A pre-plan is only useful if it reflects current conditions. A firefighter reading the Hazards section would see "cooking fires" and not know the roof is now lightweight truss, which is exactly the kind of fact that changes whether a crew goes to the roof. The omission creates a false sense of security.
Action: flag the discrepancy to the company officer, update the Hazards section to note the lightweight truss roof and the attic's lack of fire stops, and communicate the change at the next shift briefing so crews operating there know before the fire.
3. Access is from the north only, with an 8-foot retaining wall to the south. What operational constraints does that create?
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All apparatus must approach and stage from the north, so the south side has no aerial access and no ground-level egress for occupants or crews on that side. An 8-foot retaining wall is not a usable firefighter access point without ladders, and it may block hose lays and outside ventilation on the south.
Constraints: expect congestion in the north lot, plan for hand-stretching lines around the building, pre-identify ladder placement on the north and any gaps to the south, and account for the longer time to reach south-side units. If occupants are trapped on the south side, a ladder crew will need to be assigned specifically to that side.