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Safety & OSHA

Fire Watch

In Plain English

A dedicated worker who monitors an area for fire during and after welding or other hot work.

Definition

A fire watch is a designated worker stationed to observe an area for fire during and after hot work operations such as welding, cutting, or grinding. OSHA requires a fire watch when hot work is performed near combustibles, when walls or floor openings expose combustibles, and for 30 to 60 minutes after hot work is complete. The fire watch must be equipped with fire extinguishers and trained in their use.

Why It Matters in Bidding

A fire watch is an OSHA-mandated cost of doing hot work near combustibles, and skipping it exposes the contractor to citations, fire loss, and shutdowns that dwarf the labor savings. Estimators should carry fire-watch labor in general conditions for projects with significant welding, cutting, or torch work, especially in occupied or renovation settings where the watch period extends well past the work itself.

Example

During steel modifications inside an occupied tenant space, the GC assigns a trained worker with an extinguisher to maintain a fire watch throughout the cutting and for the required period after the crew stops.

Related Terms

Hazardous MaterialSite Safety PlanOSHAToolbox Talk

Frequently Asked Questions

OSHA requires one when hot work occurs near combustible materials that cannot be moved or shielded, when wall or floor openings expose combustibles in adjacent areas, and for a set period after work stops to catch smoldering ignition. Many facilities also require a hot work permit specifying these conditions.
OSHA requires the watch to remain at least 30 minutes after hot work is completed, and many jurisdictions, insurers, or facility programs extend this to 60 minutes. The watcher monitors the area for hidden smoldering before leaving, since fires from sparks frequently ignite well after the welding stops.
The assigned person must be trained to recognize hazards, equipped with appropriate fire extinguishers, and competent in their use. They must have the authority to stop work and sound an alarm. Their sole duty during the watch is monitoring for fire, not assisting with the hot work itself.

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