How should I skirt my cabin? This summer I plan to skirt around my cabin and insulate the walls. What I do not understand is how I should do this. Should I dig a trench around the cabin so the walls will be underground? If so how deep should I go? Or should I just place the walls on the ground? My concern with doing this is ground movement. What are the chances of the ground moving enough to cause problems to the cabin? The cabin is located in the caribou hills on the Kenai Penninsula.