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CONSTRUCTIONOSHANFPA

Fire Watch
When, Why & How

A complete guide to fire watch requirements, hot work safety, and compliance documentation

By Stanislav Samek, Samektra · 8 min read · Last updated April 26, 2026

What Is a Fire Watch?

A fire watch is a dedicated individual or team assigned to monitor an area for fire hazards when normal fire protection systems are impaired or when hot work is being performed. The fire watch person must be trained, equipped with a fire extinguisher, and have no other duties during the watch period.

Fire watch is not optional — it is mandated by NFPA 101 §9.7.6, OSHA 29 CFR 1910.252(a)(2)(iii) for hot work, and NFPA 51B (Standard for Fire Prevention During Welding, Cutting, and Other Hot Work). In healthcare facilities, CMS and The Joint Commission require fire watch as part of Interim Life Safety Measures (ILSM) when sprinkler or fire alarm systems are taken out of service NFPA 101, §9.7.6.

When Is Fire Watch Required?

Hot Work Operations

Welding, cutting, brazing, soldering, grinding — fire watch must continue for a minimum of 30 minutes after hot work is completed to detect smoldering fires.

OSHA 1910.252(a)(2)(iii)

Sprinkler System Impairment

When all or part of a sprinkler system is taken out of service for more than 10 hours in a 24-hour period, fire watch is required in the affected area.

NFPA 25, §15.5

Fire Alarm System Impairment

When the fire alarm system or notification system is out of service, fire watch provides the detection and notification function.

NFPA 72, §14.2.2

Construction in Occupied Buildings

During renovation or construction in healthcare facilities when life safety features are compromised — part of ILSM requirements.

TJC PE.02.06.05

Fire Marshal Order

The Authority Having Jurisdiction (AHJ) can require fire watch for any building or event where fire risk is elevated.

IFC §901.7

Hot Work Permit Process

Before any hot work begins, a Hot Work Permit must be issued. This is required by OSHA and reinforced by NFPA 51B. The permit documents that all precautions have been taken NFPA 51B, §8.1.

1

Pre-Work Inspection

Clear combustibles within 35 feet. Protect what cannot be moved with fire-resistant covers.

2

Issue Hot Work Permit

Authorized person inspects area and signs permit. Valid for one shift or specific time period.

3

Assign Fire Watch

Trained person with extinguisher stationed at work area. No other duties during watch.

4

Post-Work Monitoring

Fire watch continues minimum 30 minutes after hot work completion. 60 minutes recommended by NFPA 51B.

Fire Watch Log Form

Every fire watch must be documented. Fire watch forms and requirements vary by jurisdiction — always check with your Authority Having Jurisdiction (AHJ) for local requirements. Select the form that matches your county:

Important: Fire watch requirements are determined by your local AHJ (Authority Having Jurisdiction). Forms, patrol intervals, notification timelines, and submission procedures differ by county and municipality. The forms below are specific to their respective jurisdictions. If your facility is outside these areas, contact your local fire marshal for their specific requirements.

▶ Watch on YouTube

See fire watch procedures explained on What The Fire Code — including hot work safety, ILSM during construction, and real-world scenarios.

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Frequently Asked Questions

When is a fire watch legally required?
NFPA 51B §5.4 requires a fire watch during all hot work in or adjacent to ordinary combustibles, and NFPA 25 §15.5 requires one whenever a fire-suppression system is impaired. NFPA 101 §4.6.10.2.4 (TJC PE.02.06.05 / ILSM) requires an interim fire watch when a building life-safety feature is out of service. OSHA 1910.252(a)(2)(iii) extends the rule to all welding, cutting, brazing, and grinding operations within 35 ft of combustibles.
How long after hot work must the fire watch continue?
NFPA 51B §5.4.6 requires the fire watch to continue at least 30 minutes after hot work ends, with frequent inspections of the area for the first hour. Many AHJs and insurance carriers require 60 minutes or longer. Healthcare ILSM watches per CMS guidance are typically continuous for the duration of the impairment.
What training does a fire watch person need?
NFPA 51B §5.4.8: trained on the use of fire-extinguishing equipment, the alarm-raising procedure, and the recognition of incipient-stage fire. There is no formal certification; the employer is responsible for documenting competency. The watcher must have an unobstructed view of the work area and a means to signal a general alarm immediately.
Can one person watch and work at the same time?
No — NFPA 51B §5.4.2 explicitly requires the fire watch to have NO other duties during the watch period. A worker doubling as fire watch creates a divided-attention failure mode that has caused numerous documented losses (FM Global Property Loss Prevention Data Sheet 10-3 cites this as a top hot-work loss cause).
What documentation does a fire watch require?
A signed hot work permit (per NFPA 51B Annex A.5.4) listing: location, work scope, start/end times, watcher names, equipment present, completion sign-off after the post-work watch period. Healthcare ILSM watches add a Fire Watch Log per CMS surveyor expectations. Most AHJs and insurance carriers want the documentation retained for at least one year.

References

1. NFPA 101: Life Safety Code, §9.7.6 — Fire Watch Requirements.

2. NFPA 51B: Standard for Fire Prevention During Welding, Cutting, and Other Hot Work.

3. NFPA 25: ITM of Water-Based Fire Protection Systems, §15.5 — Impairment Procedures.

4. OSHA 29 CFR 1910.252(a)(2)(iii) — Hot Work Fire Watch Requirements.

5. The Joint Commission: PE.02.06.05 — Interim Life Safety Measures.

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