If
the attic is colder than the living space, moisture from the
conditioned air will condense as soon as it comes into contact with
colder building surfaces, like roof decking. This moisture can cause
mold and mildew, or drip down onto the ceiling, leading residents to
think there is a roof leak.
Moisture in the attic degrades the performance of insulation, damages building materials, and can harm residents' health.