More air leaks in and out of the living areas through the attic than anywhere else. That is especially the case in wood frame homes. Potential leakage points in the attic include dropped soffits, where the ceiling is interrupted, or its height varies.
Attic air leakage could also result from spaces close to the chimney, ducts, plumbing penetrations, light fixture boxes and wiring holes. Attic interior and exterior walls and joints are also possible air leakage points, while knee walls, doors, and hatches associated with the attic shouldn’t be ignored.
Leaky attics could also be behind moisture problems in your house. When humid air makes its way to the attic through leakage paths, it may condense and compromise your insulation’s quality.