Drone Roof Inspection

Drone and Thermal Roof Inspection in Seattle

Walking a multi-acre logistics roof in Renton or a sprawling fabrication building along the Duwamish takes a two-person crew the better part of a day, and they will still pass over moisture they had no way to see from deck level. We inspect commercial roofs across Seattle from the air, pairing a high-resolution aerial camera with a radiometric infrared sensor, so the full surface gets mapped, hidden water gets located, and you walk away with a record an adjuster will accept. The crew never sets foot on a roof we have not first learned to trust.

That restraint is not caution for its own sake. The riskiest moment in any assessment is the first step onto an unknown deck, and the aging low-slope assemblies across SODO, Interbay, and the older Ballard industrial stock are exactly where that risk hides. Saturated insulation and rotted cover board can sit under a membrane that reads fine underfoot until it doesn't. Flying first means we find the soft, dangerous areas before anyone is standing on them.

Why We Lead With Infrared

The single most useful thing a drone inspection delivers in this climate is a moisture map, and the physics behind it are simple. Seattle's long wet stretch drives water into low-slope roofs through tired seams, cracked pitch-pan seals, and pinholes no naked eye will catch. Once water is inside the insulation it travels sideways, often surfacing far from where it got in, while the membrane above stays deceptively clean.

Wet insulation releases stored heat more slowly than the dry field around it. We fly the thermal pass in the evening cooldown, after a day of solar gain has charged the roof, and the saturated zones glow on the sensor because they shed that heat at a different rate. The infrared image draws the exact outline of the wet areas, and that one finding usually settles the whole project: cut out and patch where moisture is contained, recover where the field is mostly sound, replace where saturation has run too far to chase. Skip the survey and you are choosing a scope blind, and a wrong guess in either direction spends real money for nothing.

Seattle Roofs Are Built to Hide Water

Our overcast skies and steady drizzle rarely hand a roof the fast, hard drying cycles that push problems into the open. Sections shaded by taller neighbors downtown, or shaded by the mature tree canopy up toward North Seattle, stay damp for weeks at a stretch. Moss and biological growth take hold and pin still more water against the membrane. The result is assemblies that can carry concealed moisture for years before a ceiling stain finally gives it away. A thermal survey is how an owner gets in front of that instead of reacting to it after the drywall is wet.

Documentation Built to Survive a Claim

After a windstorm sweeps in off the Sound or a rare hail cell passes through, a paid claim and a denied one often come down to documentation. We capture GPS-tagged imagery that ties every frame to a precise spot on the roof, so an adjuster reviewing the file from a desk can see exactly where the membrane lifted, where edge metal tore free, and where rooftop units took a hit.

• Hail strike locations and impact density across the field
• Wind-driven membrane lift, billowing, and perimeter edge-metal failures
• Damage to HVAC curbs, vents, and other rooftop equipment
• Overall membrane condition keyed to a roof plan

We assemble the package the way commercial property carriers expect to receive it, and for time-pressured claims we can turn a documentation set around quickly after the flight. Because no one had to wrestle the roof to collect the evidence, there is no later argument about whether the inspection itself caused any of the damage in the photos.

FAA Rules and Flying Safely Over the City

Putting an aircraft over commercial roofs in Seattle is not a free-for-all, and we treat the airspace with that seriousness. Every flight runs under FAA Part 107 commercial rules. Much of the city sits inside controlled airspace tied to Seattle-Tacoma International and Boeing Field, so flying there requires authorization through the FAA's LAANC system before we leave the ground. We confirm the airspace, check for temporary flight restrictions, and plan the operation to keep the aircraft within visual line of sight and clear of anyone below. On dense blocks around the downtown core and South Lake Union, we coordinate access and timing so the work stays safe for pedestrians and tenants, not merely efficient for us.

Catching the Right Window for a Thermal Pass

An infrared survey is only as good as the conditions it is flown in, and Seattle is stingy with them. The roof needs a real temperature swing for wet and dry areas to separate on the sensor, which means we wait for a day with enough solar gain and then fly into the evening as the surface gives that heat back. A flat gray day puts no charge in the roof and produces a flat gray image that tells you nothing. The top surface also has to be dry, because standing rainwater masks the very signatures we are hunting. We track the forecast and book the flight into the window that works rather than burning a trip on a day the data would be worthless. That patience is a large part of why the moisture map we hand over is something you can actually build a scope around.

What a Moisture Map Changes About Cost

All of this matters because it is about money. A roof that looks finished from the parking lot might have water confined to two corners and one failed drain, in which case a surgical cut-and-patch keeps a sound roof in service for years. A roof that looks fine might be saturated across a third of its area, in which case recovering over it just seals the water in and buys a shorter, costlier failure. The thermal map is what lets us recommend repair, recover, or replacement with confidence instead of defaulting to the most expensive cautious option. For owners running several buildings across the Eastside and the I-405 corridor, that same data feeds capital planning so reroof dollars land on the roofs that genuinely need them first.

Tighter Specs Before a Reroof

Aerial inspection earns its keep before any replacement goes to bid, too. We verify roof area, locate every penetration and equipment curb, and document existing conditions from above so the specification reflects what is actually up there. That accuracy trims the requests for information and change orders that pile up when a bid was built on assumptions instead of a survey.

When Flying the Roof Is the Right Call

Aerial and thermal inspection pays off on large, flat commercial roofs: warehouses and distribution buildings through Kent and Renton, big-box retail, office complexes, and multi-building campuses where a foot survey is slow and leaves gaps. For any commercial roof beyond roughly ten thousand square feet that needs a full condition assessment, flying it is faster, safer, and more thorough than walking it. On small footprints or steep slopes a hands-on inspection is often the quicker tool, and we will say so when it is. To get moving, send the building location, the roof's use, any active leak locations, and its age if you know it, and we will scope the right flight for your roof.