Where are air-leakage pathways most commonly found in a building?

Air-leakage pathways are most commonly found in the attic due to several factors related to building design and construction practices. Attics are often the area where various structural elements, such as walls, roofs, and ductwork, converge, creating multiple potential gaps and openings. Common sources of air leakage in attics include spaces around ductwork, electrical fixtures, plumbing vents, and the seals of attic hatch doors.

In addition, the warm air rising from the living spaces below can create significant pressure differences, leading to increased air movement into and out of the attic. Insufficient or improper sealing in these areas can result in not only energy loss but also potential moisture issues, which can affect the home’s overall insulation effectiveness and lead to damage over time. Therefore, for effective air quality and energy efficiency, inspecting and addressing air-leakage pathways in the attic is crucial.