In order to let the outside walls dry, all the cement plasters needs to be removed. As I have not electric power onsite all the work needs to be done by hand. So I chose to remove at first the plaster up to 1.30 meter from the ground.After 6 hours of work I managed to complete the first wall.
Before:
After:
The stones stick together with a clay rich soil with some hair (probably from goats) and a little of straw. The soil was covered with a second mix of the same soil and lime but it was not recovering completely the stones. On top, to layers of cement plaster. A first very thin one and a second much thicker.