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NFPA 51B — COMPLIANCE GUIDE

NFPA 51B: Fire Watch for Hot Work

Welding, cutting, brazing, and other spark-producing work are among the most common fire watch triggers on construction and industrial sites. NFPA 51B is specific about timing.

During + 30 min afterFire watch threshold
NFPA 51BGoverning standard
THE THRESHOLD

A dedicated fire watch is generally required during hot work and for at least 30 minutes after the work stops, since smoldering material can ignite well after the tool is put down. Some permits or AHJs extend this monitoring period further depending on the materials present.

WHO THIS AFFECTS

If this is you, you probably need coverage.

  • General contractors and subcontractors performing welding, cutting, or brazing
  • Facilities teams doing maintenance work involving open flame or sparks
  • Roofing contractors using torch-applied materials
COMMON QUESTIONS

NFPA 51B in practice

Does hot work always require a permit as well as a fire watch?
Most AHJs and insurance carriers require a hot work permit in addition to fire watch coverage — the permit process typically confirms the fire watch is arranged before work starts.
Can the person doing the hot work also serve as their own fire watch?
No — NFPA 51B calls for a dedicated fire watch person whose only job is monitoring for fire, separate from whoever is performing the work.
What happens if hot work runs longer than planned?
Fire watch coverage should extend to match — we can adjust coverage in real time based on updates from your site.

Need fire watch on site tonight?

Certified personnel and complete round documentation your AHJ will accept.

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