Fire comments are the comments that move modules. Once the array moves, the rail spans you already sealed are no longer the spans on the roof, and that is when a solar fire marshal PE stamp stops being optional. The building official may have been willing to skip a seal. The fire district just made the layout a structural problem.
Athol Energy sees this on East Coast rooftops more than on ground mounts: a pathway appears in a comment letter, the designer erases a column of modules, and someone still tries to reuse the old PE sheet. The fire marshal is not the engineer. The engineer still has to own the new load path. Treat fire review as a layout gate, not a sticker pass at the end.
What a solar fire marshal PE stamp actually covers
The fire desk cares about how a crew gets to the ridge, how they ventilate, and how they kill the array. The PE cares about whether the remaining attachments still work after you carved those paths. A stamp after fire comments is usually a structural reseal of the roof plan and attachment layout, sometimes with an electrical reseal if disconnects or rapid shutdown locations moved. It is not a second fire review. Do not send the PE a fire code essay. Send the revised layout with dimensions the inspector can tape.
Codes in play are local. Many fire districts point at NFPA 1, the International Fire Code as adopted, and the electrical code for shutdown labeling. Start with the editions named on the permit. Useful primary pages are NFPA 1 [VERIFY URL], ICC codes [VERIFY URL], and NFPA 70 [VERIFY URL]. Copying a pathway width from a blog post, including this one, is how you get a second comment letter. [CONFIRM AS OF 2026-09-19]
Stamford, Greenwich shoreline towns, and other Connecticut AHJs we support will send rooftop solar to fire when setbacks look tight on a steep or complicated roof. That is a town decision, not a statewide PE rule. See Connecticut solar design services for how we package those jobs. Massachusetts and Rhode Island towns split the same way: some fire companies never see a residential array, some want a full roof plan before the building permit prints.
Comments that change structure
Pathway and setback comments change structure. If the marshal wants a clear ridge, a hip path, or a space at a roof hatch, modules come off and rail spans change. Ballasted commercial jobs lose weight in the path and may need more ballast at the new array edges. Attached residential jobs may need extra attachments because you just shortened a rail. That is PE work. A designer “tightening” the same stamp is a license problem, not a drafting shortcut.
Ventilation and access comments change structure when they force a walkway through a ballast field or require a designated fire access side that was previously full of modules. On a low-slope commercial roof, that walkway is a snow drift edge and a wind edge. The PE needs those edges named. If your original stamp assumed a continuous field, the new edges are a new design.
Equipment location comments change structure when a disconnect, combiner, or inverter moves from a wall to a roof curb, or from a garage to a fire-rated path. Roof-mounted equipment needs attachment and, often, a curb detail. Wall-mounted equipment needs a mounting note the PE can own. Do not leave a cloud that says “relocate per fire” with no new detail.
Comments that should not trigger a PE
Label text, knox-box notes, and “provide a laminated site plan in the electrical room” are operations comments. Fix the placard sheet. Do not burn PE calendar on a font size. If the marshal wants the rapid shutdown plaque at the service, that is an electrical sheet change. It only becomes PE work if your electrical PE already sealed a different plaque location and the AHJ requires that seal to move with it.
Hydrant and fire-lane notes on a site plan are civil. Show them. Do not ask a structural PE to stamp a parking stripe. If the comment is “show fire department connection,” show it. If the comment is “move the array 10 feet off the FDC,” now you are back in layout, and now you may need the seal.
How fire comments collide with the already-stamped set
The failure mode is sequence. Installer submits an unstamped residential set. Building is fine. Fire wants paths. Designer adds paths and, because a neighboring town once asked for a PE, they also send the new layout for seal. The PE sees a roof plan that still has the old module count in the title block and the new paths drawn as a gray hatch with no dimensions. That set fails PE review for the same reasons any set fails: missing dimensions and conflicting callouts.
The other failure mode is a sealed set that already went to building. Fire comments arrive after the PE signed. Someone clouds a path on the sealed PDF and resubmits. The building official now has a stamped drawing that no longer matches the stamp. We redo the attachment layout, send it back through PE stamping, and resubmit with a revision log that cites the fire letter by date. The letter date belongs on the revision description. “Per fire” is not a revision description.
Do not invent a town. If your AHJ is not listed on our service areas city pages, still name the AHJ and the fire district on intake. Fire districts do not always match city limits. A job “in” a Pennsylvania borough can sit in a township fire company. Put both names on the cover sheet so the comment letter has a home.
What we change on the drawings after a fire letter
Permit design after fire comments is layout first, stamp second. We dimension the required access on the roof plan in the same units the inspector uses. We show what was removed, not only the new outline. A before/after cloud without a count change in the module schedule is a future inspection fail. The electrical single-line gets a new stringing note if strings broke. Rapid shutdown boundaries get a check if a roof section is now isolated by a path.
Attachment layouts get new max spans and new edge distances at the freshly cut array edges. Manufacturer span tables do not care that fire asked for the path. They care about the rail you have left. If the remaining rail is too short for the table, the product changes or the path moves after a conversation with the marshal. That conversation is faster than asking the PE to bless an illegal span.
Placards: fire reviewers read the service equipment. If they asked for a specific shutdown location, the placard sheet, the SLD, and the site plan all point at the same can. Mismatch here is how you pass plan check and fail inspection. The PE who sealed the electrical sheet should see the same location the marshal will walk to.
Commercial jobs add fire-rated penetrations, house keeping pads, and sometimes a firefighter plan sheet the building official never asked for. If the AHJ wants that sheet, it is part of the set, not an extra PDF in email. Elevation views showing equipment height at the roof edge show up in some city comments. Draw them if asked. Do not pre-draw a library of unused sheets that conflict with the roof plan.
Keep interconnection from inheriting the fire fight
PTO still sits with the utility after inspection. Fire-driven module counts change kW. If you already filed simplified interconnection on the old kW, update it. A sealed roof plan with 22 modules and a utility application with 28 is two systems. We would rather hold the utility file for a week than explain a kW cut after the study screen started.
Send the fire letter with the job. Paraphrase comments are how “provide roof access” becomes a 24-inch guess. Call Athol Energy at +1 (209) 266-2669 with the letter, the current sealed or unsealed PDF, and the install week you are protecting. We will tell you whether the comment is a label, a layout, or a reseal.
Fire comments that move arrays turn into engineering whether the original permit needed a seal or not. Get the paths on the roof plan with dimensions, then get the solar fire marshal PE stamp on the layout that will actually be built. The marshal’s letter is the reason. The PE seal is how the building official can approve the new roof.