Aerial and thermal drone roof inspection across Louisville, KY: map trapped moisture on large low-slope roofs without foot traffic, with Part 107 / LAANC-compliant flights and adjuster-ready reports.
Picture the inspection problem on a quarter-million-square-foot fulfillment roof. One person, a tape, a clipboard, and a few hours of usable daylight against acres of membrane, hundreds of seams, dozens of drains, and equipment curbs scattered across the field. A foot inspection of a roof that size is slow, it grinds traffic into a membrane we have not yet confirmed is healthy, and it still leaves gaps simply because no one can study every square foot before the light fails. The distribution roofs out by Riverport and the Louisville International Airport cargo ramps, the long retail strips along Dixie Highway and Bardstown Road, and the sprawling multi-roof campuses through the East End are exactly the inventory where a drone changes the economics of inspection. We fly the entire roof on a consistent grid, hold a fixed altitude so every frame is comparable, and capture it all in a sliver of the time a walkover would burn.
To be clear about what the drone is and is not: it is the fastest, most thorough way to find the spots that need a closer look. It is not a substitute for a roof cut. When the imagery flags something, we still get on the roof and verify it by hand. What the aircraft buys us is a complete, georeferenced map that tells us exactly where to spend that hands-on time.
Anyone can take pretty aerial photos. The reason we put a radiometric thermal camera on the aircraft is to answer the one question that decides an owner's biggest roofing expense: where is water sitting inside the assembly, underneath the membrane, where you cannot see it from above or below. Wet insulation carries more thermal mass than the dry insulation surrounding it, so it absorbs and holds the day's solar heat longer. We time the thermal flight for the cool-down window after sunset, when the dry field has shed its heat and radiated it back to the sky but the saturated areas are still warm. On the infrared image those wet zones glow against a dark, cooled background. Fly it at midday instead and the whole roof is hot, the contrast collapses, and the survey tells you nothing.
That moisture map is the difference between a repair quote and a replacement quote. A few isolated warm pockets in an otherwise dry roof point to targeted cuts and patches. A thermal image that lights up across a third of the roof means the insulation is spent, and recovering over it would seal that water in under a brand-new membrane. Louisville's long, humid summers make trapped moisture a chronic condition on aging low-slope roofs, and the thermal flight is the only practical way to size the problem before anybody opens the membrane. We confirm the glowing areas with core cuts so the eventual scope rests on verified conditions rather than a thermal picture by itself.
Commercial drone flight is regulated, and our local airspace makes that more than paperwork. We operate under the FAA's Part 107 rules with a certificated remote pilot in command on every job. Louisville Muhammad Ali International Airport and the round-the-clock UPS Worldport operation sit squarely in the middle of the metro, which puts a large share of the commercial roof inventory inside controlled airspace where a LAANC authorization has to be in hand before the aircraft lifts off. We pull those authorizations, check the day's notices to air missions and the weather window, keep the aircraft within visual line of sight, and stay off any flight path that would put us near the approach and departure corridors that keep this city's cargo economy moving.
The safety argument on the ground is just as concrete. Flying the roof before anyone steps onto it means no crew member is walking blind toward a soft deck, a hidden skylight, or a section gone spongy from saturated insulation. We brief the site, establish and clear the launch and recovery zone, and keep people out of the flight area. The owner gets a full condition assessment gathered without a single boot landing on a roof we have not yet proven is safe to stand on.
When hail or a wind event rolls through, an insurance adjuster wants location-tagged proof, and aerial imagery delivers precisely that. Our storm report maps hail-impact density, marks wind-lifted or torn membrane, and documents damage to rooftop units, flashings, and edge metal, with each image pinned to its position on the roof. That is the format commercial carriers ask for, it goes straight into a claim file, and we move post-storm inspections to the front of the schedule because claim deadlines do not wait.
The same data set does double duty for capital planning. Before we write a reroofing proposal, a flight confirms the true roof area, locates every curb and penetration, and records existing conditions so the specification reflects the building as it stands today. That accuracy pays off once the project starts, cutting the field surprises, requests for information, and change orders that pile up when a scope was built from a hand tape and an optimistic memory instead of measured imagery.
It covers the whole roof systematically at a fixed altitude and produces a complete photographic record without the foot traffic that wears a membrane or risks a crew on an unverified surface. On large low-slope roofs a walkover eats hours and still misses ponding and conditions a person cannot reach, and thermal moisture mapping simply is not feasible on foot.
Under the right conditions, yes. Flown during the cool-down after sunset, the thermal camera reads wet insulation as a warm signature because it releases the day's heat more slowly than the dry field around it. We always confirm those warm zones with core cuts before finalizing a scope.
They are. We fly under Part 107 with a certificated remote pilot, and because much of Louisville falls in controlled airspace near the airport and the UPS hub, we obtain LAANC authorization wherever it is required and stay within visual line of sight throughout the flight.
The report maps hail impact and density, wind damage, and equipment and flashing damage with every image tied to its roof location, in the format commercial carriers expect. Post-storm claim inspections move to the top of our schedule.
Large low-slope roofs benefit most: warehouses, distribution centers, retail strips, hotels, schools, and multi-building campuses. On small or steeply pitched roofs a manual inspection is quick and complete, so the drone earns its keep above roughly 10,000 square feet.
Tell us about the building and the roof problem. We'll document it and put a plan in writing — no pressure, no boilerplate.
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