Capability
Infrared Roof Scanning
Infrared thermography can survey 100,000 square feet of roof in a single evening and map probable moisture zones across the full area — a tool that core sampling alone cannot match at that scale. We use IR to guide core sampling, not to replace it.
Infrared roof scanning operates on a specific physical principle: wet insulation retains heat longer than dry insulation after the sun sets. A thermal camera scanning the roof surface two to four hours after sundown sees moisture zones as warmer anomalies against the cooling dry field. A trained thermographer maps those warm anomalies across the full roof area, producing a candidate moisture map that shows where insulation may be saturated.
That is a powerful tool in the right conditions. It is also a tool with specific operational limits in Cincinnati's Ohio Valley climate — and those limits matter to how we apply it. Cincinnati's humid-continental climate creates a shorter reliable IR window than drier markets. High ambient humidity in late spring and summer reduces the temperature differential between wet and dry insulation zones, producing thermograms that are harder to read confidently. The Ohio River's moderating effect on overnight temperatures in the warmer months — keeping the basin warmer than surrounding uplands — further compresses the differential that makes wet-zone anomalies detectable.
The Cincinnati IR season runs reliably from October through March. In that window, daytime solar loading on the roof surface is sufficient to charge the insulation assembly, and evening temperatures in the Ohio Valley drop quickly enough to create a clear differential between wet and dry zones by 8 to 10 PM. April and September are marginal — usable in some weather patterns, ambiguous in others. May through August is generally not the right tool for a capital decision in this market.
When IR Works and When It Does Not in the Ohio Valley
Conditions that produce clear, usable thermograms: At least four hours of direct solar loading on the roof surface during the day, a temperature differential of at least 15 to 20 degrees Fahrenheit between the roof surface and ambient air at scan time, no wind above 15 mph (wind equalizes surface temperatures and suppresses anomaly contrast), no precipitation in the prior 48 hours (wet membrane surface from rain creates false-positive anomalies across the full field), and a clear daytime sky that allowed adequate solar loading.
Cincinnati-specific conditions that compromise thermograms: The Ohio River basin's cloud and fog pattern in late fall and winter can produce overcast days with insufficient solar loading even when the evening clears. Post-cold-front nights with rapid temperature drops can produce false-positive anomalies at rooftop equipment and parapet transitions where thermal mass rather than moisture is the driver. The basin's moderate humidity in shoulder seasons creates ambient conditions that require conservative interpretation of marginal anomalies.
Membrane type matters in Cincinnati: Many commercial buildings in the Blue Ash and West Chester corporate corridors installed white or light-grey TPO after 2010 to White TPO absorbs less solar energy than darker membranes and produces a weaker IR signal — the temperature differential between wet and dry zones is smaller and the thermogram requires more conservative interpretation. On these buildings, targeted core sampling at strategic density often produces higher-confidence data than IR at comparable cost.
How We Combine IR With Core Sampling
The IR scan produces a thermogram with warm anomaly zones marked as probable moisture locations. We then pull cores at each significant anomaly zone to confirm the finding — dry, damp, or wet. We also pull cores at several presumed-dry zones identified in the thermogram to establish baseline and verify that the IR read is accurate for that specific building.
This approach — IR to map probable zones, cores to confirm — covers large Cincinnati buildings with higher confidence than either tool alone. IR alone produces probable locations without physical confirmation. Core sampling alone at the density needed to find all significant wet zones on a 100,000 square foot building in the CVG logistics corridor or the UC Health campus on Burnet Avenue would require 30 to 40 core pulls. IR plus targeted cores typically produces equivalent confidence at 15 to 20 core pulls — faster, lower core count, and less disruption to the existing membrane.
The combined deliverable is a moisture distribution map with each zone coded at three confidence levels: confirmed-wet (core-verified), probable-wet (IR anomaly without core confirmation), and dry (IR and core both clear). That three-level classification tells the owner where the data is definitive and where it is inferred — which matters when the decision is between a $200,000 recover and a $450,000 full replacement.
Equipment and Report Format
We use FLIR commercial-grade radiometric thermal cameras calibrated for roofing applications. Thermograms are captured at full radiometric resolution and delivered in the report alongside the visible-light photograph of the same zone — every anomaly in the thermogram corresponds to a visible-light photo showing the membrane surface condition at that location.
The IR report is formatted as an addendum to the condition report rather than a standalone document. The moisture survey findings — thermogram mosaic, annotated anomaly map, core-confirmation results — integrate into the full condition record and are referenced against the zone diagram used for all prior and subsequent inspections on that building. The moisture data does not sit in a separate file that gets separated from the condition record over time.
Frequently asked questions
Why does roofing IR need to be done after dark?
Daytime IR does not detect moisture in roofing assemblies. The roof surface is uniformly heated by solar radiation during the day and the differential between wet and dry insulation zones is suppressed by that uniform surface heating. Roofing IR is conducted two to four hours after solar peak when the surface has begun cooling — wet insulation retains heat and produces the warm anomaly that the thermal camera detects against the cooling dry field. We schedule Cincinnati IR surveys in the late evening window.
What is the best season for IR scanning in Cincinnati?
October through March is the reliable window. November through February typically produces the strongest results in Cincinnati — daytime temperatures still generate adequate solar loading on roof surfaces, and Ohio Valley evenings in that window drop quickly enough to create a clear thermal differential by 8 to 9 PM. October and March are good in most weather patterns. April and September are marginal. May through August is generally not the right tool for confident capital-decision data in the Ohio Valley climate.
Is infrared scanning required for every moisture survey?
No. Core sampling without IR is appropriate for smaller Cincinnati roofs — under 40,000 square feet — and for buildings where prior inspection has already identified the probable moisture zones. IR adds the most value on large roofs where a full-coverage core grid would be expensive, and where the Cincinnati IR season conditions are favorable for the building's membrane type. We recommend based on the specific building and the decision it needs to support, not as a standard upsell.
Do you carry calibration documentation for your thermal cameras?
Yes. Calibration records for our thermal imaging equipment are available for any project where the IR report will be used in insurance, litigation, acquisition due diligence, or other contexts where equipment calibration documentation is required by the receiving party.
Schedule an IR moisture survey for your Cincinnati commercial roof.
We assess whether IR conditions are favorable for your building and timeline, then combine IR scanning with targeted core sampling to produce a moisture distribution map your capital decision can stand on. Call 513-877-6954 or use the form below.
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