The insulation of components in contact with the ground on their outside is also called perimeter insulation, it is always outside the waterproofing of a building. Particularly high demands are placed on perimeter insulation, as it is directly adjacent to the ground and is thus exposed to pressure, moisture, chemical effects and the effects of traffic loads. Therefore, perimeter insulation is pressure-resistant, rot-resistant, and does not absorb moisture (or only to a small extent).
Source: bauwion
