A Drone Can Photograph Your Roof, but It Cannot Press on It

A drone can show you a missing shingle, a bent vent cap, debris in a valley, or an open branch hole without putting a person on the roof. That makes it useful. It does not make it a complete roof inspection. A camera cannot press on a soft section of decking, lift the edge of a loose shingle, check the seal around a pipe boot, or feel whether a repair has become brittle. If you are deciding whether to repair, replace, or simply watch the roof, ask whether the findings came from photographs alone or from a hands-on examination.

Inspection

A drone gives the inspector a broad view. It can photograph steep slopes, upper dormers, chimney sides, and roof sections that are difficult to see from the ground. The images may also help locate an obvious defect before anyone sets a ladder. On a large or complicated St. Louis house, that overview can save time and establish where closer attention is needed.

The limitation is distance. Some roof problems are visible only after a person gets close enough to touch the material. A lifted shingle may settle flat when there is no wind. A split in a pipe boot can hide on the uphill side of the pipe. A nail head may be exposed by less than an inch. Step flashing can be missing behind siding even though the roof and wall look orderly from above.

Hail marks also require close examination. Dark circles in a drone image are not automatically hail damage. They may be algae, manufacturing marks, old scuffs, bird debris, or changes in lighting. A person on the roof can check the surface, photograph individual marks at close range, and compare them with nearby metal components. The purpose is documentation, not a conclusion based on one overhead photograph.

Decking is another reason contact matters. An inspector walking the roof may notice movement underfoot or a localized soft area near an eave, valley, skylight, or chimney. That movement does not identify the cause by itself, but it tells the inspector to look more closely. A drone cannot apply weight or distinguish solid decking from decking that flexes.

The same is true at the roof edge. St. Louis freeze thaw cycles can be hard on eaves, especially where water has backed up behind ice or entered through a weak edge detail. From above, the shingles may still look aligned. A hands-on check may find loose metal, deteriorated wood, an unsupported shingle edge, or evidence that water has traveled behind the gutter.

An inspection should not stop at the shingles. Water stains, compressed insulation, rusted fasteners, disconnected exhaust ducts, and dark roof decking may be visible inside the attic. A bathroom fan that empties into the attic can create moisture that resembles a roof leak. Frost on the underside of the deck can melt and leave stains after a cold spell. Drone photographs cannot separate those conditions because they show only the exterior surface.

There are roofs that should not be walked. Wet shingles, frost, ice, extreme pitch, fragile materials, deteriorated decking, and active wind can make access unsafe. In those conditions, a responsible inspection may use a drone, ladder views, attic access, and ground observations, then return when the surface is safe. The issue is not whether every roof must be walked that day. The issue is whether the limits of the inspection are stated plainly.

What it costs

A free roof inspection does not mean every possible diagnostic step is included. Before the appointment, ask what the inspector plans to examine and what you will receive afterward. For a typical asphalt shingle roof, a useful inspection should identify the slopes viewed, the areas physically accessed, the components checked, and anything that could not be reached.

If drone photographs are the only exterior evidence, the written result should say so. That distinction matters when the proposed repair depends on a condition the camera could not confirm. For example, a photograph may show staining around a vent, but it cannot prove whether the boot is split, the flange is improperly lapped, or the water is entering somewhere uphill.

Access can affect the next price you receive. A repair quote based on one distant image may change after a roofer reaches the area and finds soft decking, a second layer of shingles, deteriorated flashing, or an incompatible earlier repair. That does not automatically make the revised price improper. It does mean you should know which conditions were verified and which were assumptions.

Ask for the repair to be described by component. A written scope might identify the pipe boot, shingles around it, underlayment, flashing, and any decking rate that would apply if damaged wood is found. A vague line such as roof repair does not tell you what is being opened or restored.

Age also changes the decision. An older three tab roof can be difficult to repair cleanly because the shingles become brittle and their seals resist lifting. Once that roof is near the end of its useful condition, replacing a few pieces may disturb adjacent shingles or leave a visibly different patch. There is no single birthday that makes every three tab roof unrepairable. Sun exposure, ventilation, prior work, slope, and storm history all matter. A hands-on inspection helps determine whether the surrounding shingles can tolerate the work.

Municipal requirements are separate from the inspection price. St. Louis County contains many cities with their own permit desks and procedures. If the finding leads to replacement or a larger repair, ask which municipality has authority over the address and whether a permit is required for that scope. Do not assume that a county mailing address means the county desk is the only desk involved.

What to ask

Start with one direct question: Did someone physically reach the area you are recommending I repair? If the answer is no, ask what prevented access and what still needs to be confirmed. A clear answer may be that the roof was icy, too steep, wet, fragile, or unsafe. You can then decide whether to schedule a return visit instead of approving work from incomplete information.

Useful follow-up questions include:

• Which slopes were walked, and which were viewed only by drone or from a ladder?
• Was the attic accessible, and was the underside of the suspected area examined?
• Were pipe boots, vents, valleys, wall flashing, chimney flashing, skylights, and roof edges checked closely?
• Did you find soft decking, or is decking condition still unknown?
• Are the photographs close enough to show the defect rather than only its location?
• Can the surrounding shingles be lifted for a repair without cracking?
• What part should be repaired now, and what can be monitored?
• What conditions could change the written price after the roof is opened?

Ask the inspector to label photographs by roof area. Terms such as front slope, rear slope, garage valley, north dormer, and chimney uphill side are more useful than a folder of unlabeled images. The written notes should connect each recommendation to a specific photograph or measurement.

If a contractor points to hail or wind damage, ask for ordinary maintenance defects to be separated from storm observations. Popped nails, aged sealant, animal damage, worn pipe boots, and installation errors do not become storm damage merely because they were found after a storm. Keys Roofing can document observed conditions and place photographs, measurements, and a written scope in your hands. The homeowner remains responsible for dealing with any insurer.

You should also ask what was not inspected. A locked attic hatch, finished ceiling, solar array, low clearance, snow cover, or inaccessible upper slope can leave gaps. Those gaps do not invalidate everything else, but they should appear in the report so you know how firm the recommendation is.

For a roof inspection in St. Louis or the greater St. Louis area, call Keys Roofing at (314) 220-2333. Ask before the appointment whether the planned visit includes roof access, attic access when available, photographs, measurements, and a written explanation of any area that cannot be reached.