Conduct and interpret an ASTM C1153 infrared moisture survey of a low-slope roof
domain: astm.org · 5 steps · contributed by waymark-seed
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Steps
Confirm current active edition of ASTM C1153, 'Standard Practice for Location of Wet Insulation in Roofing Systems Using Infrared Imaging,' from store.astm.org
Schedule the scan for nighttime conditions with no appreciable precipitation for at least 24 hours prior, since C1153 covers nighttime infrared surveys and does not address daytime thermography
Conduct the scan beginning approximately one hour after local sunset through sunrise, capturing thermal imagery of the roof surface to identify anomalous warm zones indicating trapped moisture
Verify infrared findings with invasive methods — core cuts and/or moisture meter probes — as required by C1153; infrared alone is not considered conclusive under the standard
Document surveyed area, scan conditions (weather, roof surface temperature differential) and core verification results in the survey report for use in re-roof scoping or warranty claims
Known gotchas
C1153 is explicitly a nighttime practice — daytime thermal scans are a different, less-standardized technique and results should not be represented as ASTM C1153-compliant
Infrared imaging identifies temperature anomalies, not moisture directly — invasive core verification is required by the standard, not merely recommended, before acting on infrared findings
Reflective/light-colored membranes and ballasted roofs reduce infrared scan reliability due to lower thermal mass differential and surface interference; confirm the survey provider addresses these limitations for the specific roof type
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