Thermography detects patterns of infrared radiation emitted from surfaces and converts them into thermal images. It can help locate temperature anomalies associated with moisture, electrical heating, insulation discontinuities, or other conditions—but it does not see through walls and does not directly prove the presence of corrosion, leaks, or structural damage.
Thermography is a diagnostic tool, not a diagnosis by itself
Infrared thermography is valuable because many building problems change surface temperature before they become obvious to the eye. A wet roof assembly may cool differently from a dry area. An electrical connection carrying abnormal resistance may appear hotter than comparable components under similar load. Air leakage or missing insulation can create recognizable thermal patterns.
The key word is pattern. A thermogram shows temperature differences, not the cause of those differences. A dark or bright area may reflect moisture, solar exposure, air movement, material differences, surface emissivity, or normal operating conditions. The professional interpretation matters as much as the camera.
Where thermography fits in Florida recertification
State milestone inspections
Florida’s statewide milestone inspection under §553.899 is a structural inspection of qualifying condominium and cooperative buildings. Phase One is primarily a visual examination. If substantial structural deterioration is identified, Phase Two may include destructive or nondestructive testing at the inspector’s direction. Thermography can be one possible nondestructive tool when it helps answer a structural-condition question, but the statute does not require thermography as a standard method for every milestone inspection.
Miami-Dade local building recertification
Miami-Dade’s local building recertification program has a separate electrical requirement. The county’s current guidelines require infrared thermography for electrical systems operating at 400 amperes or greater, using approved equipment operated by a certified technician. The county’s electrical report process also includes photographic documentation.
Important distinction
Thermography is not universally mandatory for every Florida building inspection. It is specifically required in Miami-Dade recertification for qualifying electrical systems at 400 amperes or greater. Structural milestone inspections use the testing methods the responsible engineer or architect considers necessary for the observed condition.
Core instrument 1: handheld infrared cameras
Handheld radiometric infrared cameras are the most common instrument for building thermography. They allow an inspector to scan electrical panels, roof surfaces, walls, ceilings, mechanical rooms, glazing transitions, and other accessible areas while recording thermal images that can be reviewed and documented.
For recertification work, the useful features are not simply image sharpness. The instrument should support the level of temperature measurement and documentation required by the scope, and the operator must understand how emissivity, viewing angle, reflected energy, distance, and environmental conditions affect the reading.
Core instrument 2: drone-mounted thermal cameras
A thermal camera mounted on a drone can expand access to roofs, façades, parapets, and other exterior areas that are difficult to observe safely from grade. This can be especially useful for tall or complex buildings where a broad thermal survey helps identify locations that deserve closer investigation.
Drone thermography does not eliminate the need for hands-on inspection when physical verification is required. Wind, sun, reflections, viewing angle, distance, resolution, and local flight restrictions can affect what the system can reliably document. The drone is best understood as an access and screening platform, not a replacement for engineering judgment.
Complementary instruments: how thermal findings are verified
When thermography identifies an anomaly, the next step is often confirmation. The appropriate tool depends on the suspected condition.
| Instrument | What it contributes | Useful for | Important limitation |
|---|---|---|---|
| Moisture meter | Independent moisture indication at or near a thermal anomaly | Walls, ceilings, roofs, finishes | Reading depends on meter type, material, and depth |
| Digital borescope | Direct visual access through a small opening | Cavities, concealed spaces, localized verification | Only sees the limited area reached by the probe |
| Ultrasonic / other NDT equipment | Material-specific information that thermal imaging cannot provide alone | Selected concrete, steel, or assembly investigations | Method must match the material and engineering question |
| Electrical test instruments | Operating-load and circuit information that helps interpret heating | Electrical thermography | Must be used by appropriately qualified personnel |
Can thermography detect moisture?
Thermography can reveal temperature patterns that are consistent with moisture, but it does not measure water directly. Wet materials often heat and cool differently because of evaporation, thermal capacity, and changing environmental conditions. That makes infrared imaging useful for screening large areas quickly.
A suspected wet area should be interpreted together with visual evidence, weather history, building configuration, and—when appropriate—moisture measurements or localized openings. This prevents an apparent thermal anomaly from being reported as a leak without sufficient confirmation.
Can thermography detect corrosion in reinforced concrete?
Not directly. Infrared imaging may sometimes help reveal surface temperature differences associated with delamination, moisture, debonding, or other conditions that can coexist with deterioration in reinforced concrete. But a thermogram does not show reinforcing steel rusting inside the member.
If corrosion or delamination is suspected, the engineer may need additional methods such as sounding, cover measurements, material testing, electrical-potential techniques, localized openings, or other nondestructive and destructive tests appropriate to the condition. The objective is to confirm the mechanism and extent of deterioration rather than infer it from color on a thermal image.
Electrical thermography requires context
Electrical thermal anomalies are meaningful only when the system’s operating condition is understood. A heavily loaded component will normally run warmer than an unloaded one. Similar components under comparable load can provide a more useful basis for comparison than temperature alone.
The operator must also work within electrical-safety requirements and access limitations. Thermography can reduce unnecessary contact because it is performed remotely, but opening energized electrical equipment or entering restricted areas still requires qualified personnel and an appropriate safety procedure.
Environmental conditions can change the image
Thermal imaging is sensitive to the conditions under which it is performed. Direct sun can heat one façade unevenly. Wind can cool a surface. Rain can temporarily change temperature patterns. Shiny metal can reflect surrounding thermal radiation rather than represent its own true surface temperature.
- Schedule exterior scans when solar loading and weather conditions support the intended observation.
- Document ambient conditions that may influence interpretation.
- Use appropriate emissivity settings and recognize reflective surfaces.
- Compare like materials and similar operating conditions whenever possible.
- Avoid treating a single image as proof when the anomaly has not been confirmed.
Choosing the instrument should start with the question
The most sophisticated camera is not automatically the best inspection tool. An engineer should first identify the question: Is the concern electrical heating? Roof moisture? Water intrusion? Façade leakage? Suspected delamination? Difficult access? Each question may require a different combination of thermography, visual inspection, direct measurement, and testing.
This question-first approach is especially important in recertification. Testing should reduce uncertainty and support an engineering conclusion. Technology is most valuable when it helps distinguish between a condition that can be monitored, one that needs confirmation, and one that requires repair.
What owners should expect from a useful thermographic report
- A clear statement of the inspection scope and the areas scanned.
- Identification of the equipment and method used when required by the reporting authority or professional scope.
- Representative thermal and visible-light images tied to physical locations.
- Environmental or operating conditions relevant to interpretation.
- A distinction between observed thermal anomalies and confirmed defects.
- Recommendations for additional testing when the thermal image alone is insufficient.
- Engineering conclusions that connect the findings to maintenance, safety, or recertification decisions.
Key takeaway
A thermal camera makes invisible temperature patterns visible; it does not make the building transparent.
The value of thermography comes from combining the right instrument, proper operating conditions, trained interpretation, and confirmation methods. In recertification work, the goal is not to collect impressive images—it is to reduce uncertainty about the condition of the building.
About Eastern Engineering Group
Eastern Engineering Group supports owners, associations, and property stakeholders with structural inspections, building recertification, diagnostic evaluations, and repair planning. Thermography is most useful when it is integrated into a broader engineering process—one that connects an anomaly to its probable cause, confirms the condition when necessary, and translates the findings into a practical next step.
Frequently asked questions
Is infrared thermography required for every Florida milestone inspection?
No. Florida’s milestone inspection statute does not require thermography for every inspection. Phase Two may include nondestructive testing selected by the responsible engineer or architect when needed.
When is thermography required in Miami-Dade building recertification?
Miami-Dade currently requires infrared thermography for electrical systems operating at 400 amperes or greater, using approved equipment operated by a certified technician.
Can an infrared camera see water inside a wall?
No. It detects surface temperature patterns that may be consistent with moisture. Confirmation may require a moisture meter, visual investigation, openings, or other methods.
Can thermography confirm corrosion of reinforcing steel?
Not by itself. It may help identify conditions associated with deterioration, but corrosion and delamination generally require additional investigation and engineering interpretation.
Are thermal drones better than handheld cameras?
They solve different access problems. Drones are useful for broad exterior surveys and difficult-to-reach areas, while handheld cameras are better for close-range work and interior or electrical evaluations. The correct choice depends on the inspection question.
© 2025 Eastern Engineering Group wrote and published this article. All rights reserved.
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