Which of the following is a common cause of air leakage from a home into its attic?

Air leakage from a home into its attic can occur due to several factors, and the correct choice encompasses multiple common causes. Each of the identified issues plays a significant role in contributing to air movement between the interior of a home and its attic space.

Improperly sealed windows can create gaps that allow air to flow in and out, disrupting the thermal envelope and increasing the potential for air leakage. Additionally, cracks in walls and foundations serve as pathways for unconditioned air, further compromising the home's energy efficiency.

Faulty or unsealed ducts are another significant contributor to air leakage. If ductwork is not properly sealed, it can draw outside air into the system or allow conditioned air to escape, leading to inefficiencies and increased heating or cooling costs.

By recognizing that several factors can contribute to air leakage, it becomes clear that all these issues—improperly sealed windows, cracks in walls and foundations, and faulty or unsealed ducts—collectively lead to the problem of air leakage into attics, making the choice that includes all of these options the most comprehensive and accurate one.