Your sprinkler contractor calls with good news and bad news. The good news: the fire marshal signed off on your system. The bad news: it’s not the system the code actually calls for. The marshal granted an “equivalency” — an exception that lets a nonstandard design stand in for a compliant one.
You hang up and start wondering what you actually have covering your building. A letter from the fire marshal is not the same thing as a sprinkler system that will perform in a real fire. That gap between “approved” and “adequate” is exactly what a lawsuit filed in Louisiana last week put on public record, and it is a gap every property manager with an aging or nonstandard system needs to understand.
Here is the direct answer: a fire marshal’s equivalency approval does not override NFPA 25 or your adopted fire code’s impairment rules. If your system does not meet the standard design, your facility still carries the underlying risk the code was written to prevent, and your authority having jurisdiction (AHJ) or insurer can still require a fire watch — either now, while the design question is litigated, or later, if the system fails an inspection or a flow test.
An equivalency is not a permanent substitute for code compliance. It is a documented judgment call, and judgment calls get challenged. When they do, the building in the middle of the dispute is yours, not the marshal’s.
A Louisiana lawsuit shows what happens when a fire marshal approves a nonstandard sprinkler design
A neighborhood association in New Orleans sued the state fire marshal’s office and the state’s public safety department in late September 2026. The suit challenges an equivalency the fire marshal granted for a grain storage warehouse project on the Mississippi River waterfront, in a densely built residential area. The case is pending in Louisiana’s 19th Judicial District Court.
The dispute centers on a “dry gridded pipe” sprinkler layout. In a gridded system, pipes form a connected grid rather than simple branch lines. In a dry system, those pipes stay filled with air until heat trips the system and water rushes in. According to reporting on the litigation, combining the two designs is expressly prohibited, because trapped air pockets in a gridded network can delay water reaching the sprinkler heads during an actual fire.
The fire marshal’s own reviewer initially rejected the sprinkler plans for two reasons: the design itself, and insufficient coverage for the warehouse’s square footage. The project then requested an equivalency — an exception granted when a party can show meeting the literal code requirement would create a practical difficulty or unreasonable economic hardship, provided the alternative is still shown to be equally safe. The fire marshal’s office approved the request.
The lawsuit argues that approval lacked the documentation the equivalency process requires: no cost analysis, no discussion of design alternatives, and no finding that resolved the earlier square-footage concern. State statute reportedly assigns final review of practical-feasibility disputes to a dedicated board, which, according to the fire marshal’s office, has not convened this year. Whatever the court decides, the underlying fact pattern is the lesson for every property manager watching from outside Louisiana: an equivalency is a discretionary call, it can be challenged on process grounds alone, and the building’s actual fire protection can remain an open question while that challenge plays out.
How an equivalency request is supposed to work
An equivalency is not a rubber stamp. It is a formal exception process with specific documentation requirements, and knowing what belongs in a complete request tells you what to ask for if one is proposed for your building.
A complete equivalency request should show: the specific code section the design deviates from, a documented cost or feasibility analysis supporting the hardship claim, a comparison against at least one standard-compliant alternative, and an engineering finding that the substitute design performs equally well for fire detection and control. Missing any one of those elements weakens the basis for the approval — and, as the Louisiana suit illustrates, can become the exact grounds a challenge is built on.
Think of it as a formula, not a formality: hardship documentation, plus a comparison against the compliant alternative, plus an equal-safety engineering finding, equals a defensible equivalency. Leave any one term out of that equation and the approval is exposed the moment someone with standing — a neighbor, a tenant, an insurer — decides to look closely.
The approval itself should also resolve every technical objection the initial plan review raised. In the Louisiana case, the reviewer’s two objections were the prohibited gridded-dry design and inadequate coverage for the building’s square footage. The equivalency addressed the design question but, according to the lawsuit, never circled back to the coverage question. A property manager reviewing any equivalency granted for their own building should check the approval letter against the full list of the original objections, not just the headline issue.
NFPA 25 and your adopted fire code define “adequate protection,” not the approval letter
NFPA 25 is the maintenance standard that governs water-based fire protection systems after they’re installed — inspection intervals, impairment procedures, and the tagging and notification steps that start the moment a system goes out of service or is found deficient. Your local fire code, often an adopted edition of the International Fire Code (IFC), is what your fire code official actually enforces day to day. Florida is a notable exception, running on NFPA-based provisions rather than the IFC. Local adoption and amendments vary by state and city, so the specific triggers and timelines in your jurisdiction can differ from a neighboring one.
An equivalency approval answers a narrow legal question: does this specific alternative design satisfy the code’s intent closely enough to grant an exception? It does not answer a separate, more practical question: will this system actually detect and control a fire the way a correctly designed one would? Those are different questions, and a property manager who treats the first as a substitute for the second is making a mistake the code never asked them to make.
That distinction is exactly what the NFPA 25 impairment rules are built around. The moment a water-based system is impaired — out of service, undersized for its area, or performing a design the code doesn’t recognize as reliable — the impairment program applies: a named coordinator, a tag on the system, notifications to the fire department, the alarm company, and your insurer, and a decision about whether occupants can stay or whether a fire watch has to cover the gap until the system is restored or replaced.
An equivalency can trigger your own impairment decision, separate from the marshal’s approval
Here’s the operational trap. A property manager who receives word that the fire marshal approved an equivalency often assumes the fire protection question is closed. It isn’t. If the underlying design does not provide the coverage NFPA 25 and your adopted code expect, you are still operating with an impaired system in every practical sense, even though no inspector tagged it that way.
Where your code follows the IFC, Section 901.7 puts the evacuate-or-watch decision in the hands of the fire code official once a required fire protection system is found out of service or deficient. That section does not grant a grace period while paperwork like an equivalency request works through the system. Notification is immediate, and the official can require protection — including a fire watch — right away. If your jurisdiction runs on NFPA-based rules instead of the IFC, the same logic applies through NFPA 1 and your state fire marshal’s direct order authority.
Your insurer adds a third layer the code doesn’t touch. Carrier impairment and protection requirements can be stricter than the adopted code, and meeting the AHJ’s order does not automatically satisfy your policy’s conditions. A carrier that learns your sprinkler design relies on an equivalency rather than a standard listing can treat that as a material fact affecting coverage, independent of whatever the fire marshal decided.
The practical move for a property manager who learns their building’s fire protection rests on an equivalency: get the engineering basis for that decision in writing, ask your insurer directly whether the carrier treats it as equivalent for policy purposes, and decide — before anyone forces the question — whether a documented fire watch should run until the design question is settled one way or the other.
What a fire watch guard actually does while a sprinkler design question is unresolved
A fire watch guard standing a watch for an impaired or disputed sprinkler system is not there to argue engineering. The guard’s job is patrol, detection, and documentation, and it runs the same way whether the system is down for repair or operating under a design nobody is fully confident in.
Continuous patrols cover every area the sprinkler system is supposed to protect, on a schedule your AHJ or insurer sets — commonly at intervals measured in minutes, not hours, for occupied commercial space. The guard looks for the fire conditions the system can no longer be trusted to catch on its own: ignition sources, blocked egress, housekeeping hazards, anything that raises the odds of a fire starting while protection is in question.
If a fire does start, the guard’s role is immediate notification — calling the fire department first, then following the site’s internal notification plan for occupants, management, and the alarm monitoring company. A fire watch guard is not a substitute firefighter and does not attempt firefighting beyond what a portable extinguisher can handle on a small, incipient fire. Anything beyond that is the fire department’s job, and the guard’s training should make that limit clear.
Every round gets logged with a timestamp. That log is the paper trail that shows the fire department, the fire marshal, and your insurer exactly what coverage was in place during the period a system’s protection was uncertain. It also becomes the restoration record: who authorized the watch, when it started, what was found on each round, and who signed off when the watch ended because the system was repaired, replaced, or formally resolved.
What to do before you accept a sprinkler equivalency on your own property
If a contractor or your fire marshal’s office raises the possibility of an equivalency for your building, treat it as a decision point, not paperwork to file. Walk through these steps before construction or installation finishes, not after:
Request the specific code section the alternative design deviates from, in writing. Ask for the engineering basis showing the substitute performs equally well, not just a cost justification. Confirm every objection from the original plan review was addressed, not only the one that made the headlines. Call your insurance carrier and ask directly whether the policy treats an AHJ equivalency as satisfying the carrier’s own protection requirements, or whether it creates a gap the policy doesn’t cover. Document the answer in writing, because many property managers only find out after a loss, when it’s too late to fix.
If any of those answers come back uncertain, or if the equivalency is being challenged the way the Louisiana case is being challenged, put a fire watch in place while the question gets resolved. A documented watch costs far less than an uninsured loss, and it gives you a clean record showing your building was protected the whole time the design question stayed open.
A sprinkler contractor, a fire marshal’s letter, or a pending lawsuit over a system’s design can all leave your building in the same practical position: protection that is approved on paper but not fully proven in practice. The Fast Fire Watch Company provides nationwide fire watch guard service, with certified guards on site in under 3 hours, 24/7. Call 1-800-899-7524 to get coverage moving the same day a sprinkler question puts your protection in doubt. Property managers in Louisiana can review state-specific triggers and timelines on our Louisiana fire watch requirements page.
