Which is a key indication of potential foundation problems?

Cracks in interior walls are a key indication of potential foundation problems because they can indicate underlying structural issues in the building. When a foundation settles or shifts improperly, it can lead to movement in the walls above, resulting in cracks. These cracks might expand or change over time, depending on the severity of the foundation issues.

Various factors contribute to foundation problems, including soil conditions, drainage issues, and the foundation's material strength. Walls are typically designed to remain stable and straight; therefore, any visible cracking suggests that something is amiss with the structural integrity of the home. Inspectors look for the size, direction, and location of these cracks to assess the severity and possible causes of the foundation issues, making them a critical point of investigation during inspections.

The other choices do not directly indicate foundation problems. While consistent temperature change can affect a building's materials, it is not a specific sign of foundation issues. Regular moisture levels are important in assessing overall home health and can lead to issues if extreme, but they don’t directly indicate problems with the foundation itself. Lastly, stable door alignment suggests that there are likely no significant foundation issues affecting the door frames, as misalignment is more indicative of problems in the foundation.