FLIR i5 User Manual page 66

16 – Introduction to building thermography
Infrared inspections of roofs with nonabsorbent insulations, common in many single-
ply systems, are more difficult to diagnose because patterns are more diffuse.
This section includes a few typical infrared images of moisture problems on low-slope
commercial roofs:
Infrared image
10554003;a1
10554103;a1
10554203;a1
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Comment
Moisture detection on a roof, recorded during the
evening.
Since the building material affected by moisture
has a higher thermal mass, its temperature decreas-
es slower than surrounding areas.
Water-damaged roofing components and insula-
tion identified from infrared scan from the under-
side of the built-up roof on a structural concrete
tee deck.
Affected areas are cooler than the surrounding
sound areas, due to conductive and/or thermal
capacitive effect.
Daytime survey of built-up low-slope commercial
roof.
Affected areas are cooler than the surrounding dry
areas, due to conductive and/or thermal capacitive
effect.
Publ. No. T559382 Rev. a358 – ENGLISH (EN) – June 23, 2009