All of the following statements are true of frost heave EXCEPT?

Frost heave occurs when soil expands due to freezing and subsequently causes movement in structures. The correct answer highlights that raising the exterior grade height is not a common cause of frost heave. Typically, frost heave is associated with soil conditions and moisture levels rather than the elevation of exterior grade.

When the grade height is increased, it can actually work to direct water away from the foundation, potentially reducing the likelihood of frost heave caused by saturated soils freezing. As for the other statements, insulating the basement can trap moisture and promote freezing conditions, leading to frost heave. The movement due to frost heave often involves both upward and inward forces on a structure, which can undermine its stability. Lowering the grade level can also exacerbate moisture issues, increasing the risk of frost heave as it can lead to deeper frost penetration in the soil. Hence, the true aspect of frost heave lies in understanding how moisture dynamics interact with soil and foundation conditions.