What a fire watch actually is
A fire watch is a dedicated person, or people, assigned to walk a building on a set schedule looking for fire, and able to alert occupants and call the fire department immediately if they find one. It is a temporary human replacement for the automatic system that is out of service.
The word dedicated is the part people get wrong. NFPA 101 describes a fire watch as requiring action beyond normal staffing, such as assigning additional personnel to walk the affected areas. Your existing front desk person, who also has a desk to cover, is generally not a fire watch. The whole point is that this person has no competing duty when something goes wrong.
A compliant fire watch normally means all of the following:
- A person assigned to the fire watch and nothing else
- Rounds of the affected area at the interval the fire code official sets, often every 15, 30 or 60 minutes
- A written log recording each round with the time it was made and the initials of the person who made it
- A reliable way to call 911 immediately, which means a charged phone and known coverage in the building
- Knowledge of the building: exits, stairwells, alarm pull stations, extinguisher locations and how to evacuate people
- Coverage for the entire time the system is impaired, including overnight
What Minnesota actually requires
Minnesota adopts the International Fire Code as the Minnesota State Fire Code, through Minnesota Rules chapter 7511. The provision that matters here is the one on systems out of service.
In plain terms: when a required fire protection system such as a sprinkler system or fire alarm is out of service, the fire code official has to be notified, and where that official requires it, the building must either be evacuated or an approved fire watch must be provided for the occupants left unprotected until the system is back in service.
Where the 4 hour rule comes from, and why it is usually quoted wrong
Search for this topic and you will find dozens of pages saying a fire watch is required after 4 hours. That number is real, but it comes from NFPA 101, the Life Safety Code, and it does not apply to every system the way most articles imply.
| System out of service | NFPA 101 threshold |
|---|---|
| Fire alarm system | More than 4 hours in a 24 hour period |
| Automatic sprinkler system | More than 10 hours in a 24 hour period |
Two things follow from that table. First, alarm and sprinkler impairments have different thresholds, and a page that applies 4 hours to both is repeating something it did not check. Second, the hours are cumulative across the 24 hour period, not consecutive. Four separate one hour outages in a day reach the threshold just as surely as one four hour outage.
These thresholds govern where NFPA 101 applies, which includes healthcare facilities operating under federal CMS requirements, and many fire code officials use them as the practical benchmark regardless. But the operative requirement in Minnesota is still the one above: notify the fire code official and do what they require. If your fire marshal wants a fire watch at hour one, that is the requirement for your building.
The other common trigger: hot work
Impaired systems are not the only reason to post a fire watch. Welding, cutting, brazing, grinding and torch work all create ignition sources, and both OSHA and NFPA require a fire watch when that work happens near anything combustible.
The requirement that catches people out is what happens after the work stops. Most fires from hot work start from something that was already smoldering when everyone packed up.
- OSHA's welding and cutting standard requires a fire watch to be maintained for at least a half hour after the work is finished, to detect and extinguish smoldering fires
- NFPA 51B, the hot work standard, requires 60 minutes after completion, and many insurers and general contractors write the longer period into their own requirements
- The watch has to cover adjacent areas as well, including the floor below and the other side of a wall, wherever sparks or conducted heat could have reached
If you are a general contractor or a property manager scheduling hot work, budget the post-work watch into the job rather than discovering at 4 p.m. that somebody has to stay another hour.
Other situations where you may be told to post one
- Construction and renovation, where fire protection systems are not yet in service or have been taken offline for the work
- Assembly occupancies and large events, where a fire code official may require standby personnel as a condition of the permit
- A blocked or impaired exit, a failed emergency lighting system or another life safety deficiency that the AHJ decides to handle with staffing until it is fixed
- An excessive number of false alarms, which can result in a system being treated as unreliable
The log is not paperwork, it is the proof
The fire watch log is what demonstrates the watch actually happened. It should record every round with the time it was made, who made it, the areas covered and anything observed. It should be available on site for the fire code official to inspect, and it should be kept afterward.
Two audiences eventually read that log. The fire code official may ask for it during or after the impairment. And if there is a fire, your insurer will want to see that a compliant watch was in place during the period the system was down. A gap of several hours in the log at 3 a.m. is the kind of detail that changes the outcome of a claim.
How long the watch lasts
Until the system is restored to service and the fire code official is satisfied. Do not stand the watch down when the repair technician arrives, or when the panel stops beeping, or when the system is back but not yet tested and accepted. Confirm with whoever required the watch that it can end, and note that confirmation in the log.
Common mistakes
- Assigning the watch to someone who already has another job to do, which fails the dedicated-person requirement
- Not notifying the fire code official at all, on the theory that the repair will be quick
- Applying the 4 hour figure to a sprinkler impairment, or treating the hours as needing to be consecutive
- Keeping no log, or a log with round times that are suspiciously identical every hour
- Ending a hot work watch as soon as the torch goes off
- Covering the day and leaving the building unwatched overnight, which is when the risk is highest and the watch is hardest to staff
Getting a fire watch in place
This is time-sensitive work, and it is the one service where we tell people not to bother with our assessment form. Call the 24-hour line at 651-340-0420, tell us the address, which system is down and what your fire marshal has asked for, and we will tell you honestly how quickly we can staff it.
Our officers work the rounds at the interval your fire code official sets, keep the written log, and stay until the system is back and you have confirmation the watch can end. We cover the Twin Cities metro from St Paul.
This is general information, not legal advice, and it is not a substitute for direction from your local fire code official. Requirements vary by occupancy type, by jurisdiction and by the specific circumstances of an impairment. Codes are also amended over time. Always confirm current requirements with the authority having jurisdiction for your property.