What materials did early humans use to cover frame structures with roofs and walls?

They may have used animal skin, thatch or turf to cover the frame. There was evidence to suggest that the floor was covered with a layer of moss, reeds and other soft plant materials. During the Neolithic period (4000BC and 2500BC), Stone Age houses were rectangular and constructed from timber.

The best sociological research method would have to be using experiments although it has some disadvantages as well