What is the most common cause of false positives during roof moisture surveys using thermography?

What is the most common cause of false positives during roof moisture surveys using thermography?

What is the most common cause of false positives during roof moisture surveys using thermography? A) Dry insulation B) Solar loading of roofing materials C) Low camera sensitivity D) Poor focus Correct Answer: B) Solar loading of roofing materials What is Solar Loading? Solar loading refers to the heating of roof surfaces due to sunlight exposure during the day. Different roofing materials absorb and release heat at different rates. Dark surfaces → absorb more heat Light surfaces → reflect more heat Wet insulation → stores heat longer than dry insulation Why It Causes False Positives In roof moisture surveys, thermography relies on temperature differences to detect moisture. Wet areas usually: Heat up slowly during the day Cool down slowly at night BUT solar loading creates similar temperature patterns even in dry areas, leading to confusion. What happens: Sun heats the roof unevenly Some areas appear hotter or cooler due to material differences Thermographer may mistakenly interpret these as moisture Thi…