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SOG-152Fireground OperationsSOG

Defensive / Exterior Operations

When to operate from outside — and how to do it safely.

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This is a template. It is not your department's policy.

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Every placeholder marked [BRACKETED] must be completed before adoption. Every section must be reviewed against your department's staffing, apparatus, water supply, EMS scope, geography, and the specific laws of your state. What applies to a career department in a city may not apply to a volunteer department in a rural jurisdiction, and vice versa.

Standards, regulations, and best practices are updated regularly. Verify the current edition of every standard cited before adopting this document. Once adopted, this document becomes your department's responsibility — not Tailboard's.

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Number

SOG-152

Version

1.0

Last reviewed

2026-01-01

Next review

2027-01-01

Summary

This guideline governs operations when interior attack is not indicated. It covers the risk-benefit framework, collapse-zone establishment, master-stream deployment, exposure protection, and the transition between offensive and defensive strategy.

Definitions

Defensive Strategy
Exterior-only operations. No crews inside the structure. Focus: exposure protection, fire containment, and eventual building management.
Collapse Zone
A perimeter around the fire building, with a minimum radius of 1.5 times the height of the structure, into which no personnel may enter during defensive operations.
Master Stream
A high-volume stream (deck gun, ladder pipe, portable monitor) capable of flowing ≥350 gpm.
Exposure
A structure, vehicle, or other property threatened by the fire. Exposure protection means positioning streams and personnel to prevent fire extension.

Purpose

To conduct safe, effective exterior operations when interior attack is not justified, and to establish consistent rules for transitioning between offensive and defensive strategy.

Scope

Applies to all members at structural fires where Command has declared defensive strategy, and to operations during the transition from offensive to defensive.

When Defensive is Required

  • Structural integrity is compromised: fire impinging on load-bearing members, visible sag, walls bowing, floors pancaking.
  • Fire volume exceeds interior-capable attack lines.
  • No known or reasonably suspected occupants alive.
  • Staffing is insufficient for safe interior operations with Two-Out / RIT in place.
  • Hazards make interior operations unjustifiable (structural alterations, hoarding, heavy hazmat, active threats).

Transition from Offensive to Defensive

  1. Command announces the change on the tactical channel: "All units, this is Command, we are moving to defensive strategy."
  2. Sound the emergency evacuation signal on the fireground (extended air-horn blast pattern per department standard).
  3. All interior crews withdraw immediately via their planned egress and muster at a predetermined area.
  4. Command calls PAR — every unit accounts for every member.
  5. Collapse zones are established. No personnel, tools, or apparatus remain inside them except to reposition streams.
  6. Master streams are repositioned and put into service.

Collapse Zone

  • Minimum radius: 1.5× the height of the fire building. More for tall or unstable construction.
  • Mark with cones, rope, or apparatus to create a clear visible boundary.
  • Apparatus in the collapse zone is repositioned or withdrawn.
  • Personnel enter the collapse zone only briefly to reposition streams, and only with IC authorization.

Master Stream Operations

  • Deploy as many master streams as water supply allows.
  • Position streams for maximum effect without exposing personnel to flying debris or structural collapse.
  • Prefer fixed / unmanned streams (deck guns, ladder pipes, portable monitors) over hand-held in the collapse zone.
  • Coordinate stream direction — do not push fire into exposures or into areas crews may later search.

Exposure Protection

  • Identify exposures before repositioning master streams.
  • Assign crews and streams specifically to exposures — separate from fire-attack crews.
  • Water curtain and rooftop protection are common tactics; ensure personnel are not placed on adjacent roofs in danger of collapse.

Building Management

Once the primary fire is knocked down, defensive operations often shift to building management — watching for rekindle, cooling structural members, monitoring for occupancy-related hazards. Crews remain outside the collapse zone until a structural assessment authorizes entry.

Responsibilities

Incident Commander

  • Announce and justify the strategy change.
  • Call PAR on every transition.
  • Establish collapse zones and authorize any entry into them.
  • Coordinate master streams and exposure protection.

Company Officers

  • Ensure crew withdrawal is immediate and complete.
  • Report PAR clearly.
  • Manage crews assigned to exposure protection.

Members

  • Follow evacuation orders without delay.
  • Respect collapse-zone boundaries.
  • Report fatigue, injuries, or changed conditions.

Training Requirements

  • Annual training on strategy transition and evacuation signaling.
  • Master-stream deployment drills at least annually.
  • Officer-level training on risk-benefit analysis and defensive decision-making.

References

  • NFPA 1500Standard on Fire Department Occupational Safety, Health, and Wellness Program
  • NFPA 1710 / 1720Deployment standards — staffing thresholds that affect strategy

Adapt this template

Before this template becomes your department's policy, review the following items and adjust accordingly. Anything else that does not match your operation should be updated as well.

  • Specify your department's evacuation signal (air horn pattern, radio tone) in an attachment.
  • If your department routinely uses a specific master-stream tactic (e.g., blitz attack from outside before interior entry), document it here.
  • Cross-reference your Structural Interior, Water Supply, and Accountability SOGs.

Adoption signature

Adopted by (Name, Rank)
Signature
Effective date
Next scheduled review

Before adoption checklist

  • ☐Replace [DEPARTMENT NAME] throughout the document.
  • ☐Complete every [BRACKETED] placeholder.
  • ☐Confirm the current edition of every cited standard.
  • ☐Check against your state statutes and state fire marshal rules.
  • ☐Route for chief review. Topics with significant exposure (use of force, medical scope) also go through qualified counsel.
  • ☐Confirm alignment with any mutual-aid agreements.
  • ☐Schedule a training plan for the new policy before effective date.
  • ☐Announce adoption in writing to all members. Archive the prior version.
  • ☐Set the next review date — annually at minimum.