What does this pair of images show about dropped ceilings? A dropped ceiling with unconditioned space above is a poor air barrier that allows extreme air leakage to the joists and roof decking above. In this particular case, the Homeowner had an aquarium in the same room. Needless to say, mold resulted and an expensive mitigation scenario ensued.
The dark lines in the thermal scan show cold outside air being pulled in to the house during blower door testing.
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