In appearance, the structure in the photo seems unusual, but the turf coating as a roof is again popular today.. It is difficult to make such an exotic coating because it is very heavy. The beams therefore must be strong, the rafter system is powerful, and in general the whole process is quite complicated.
It is all expensive nowadays, but in the Middle Ages the earthen roof was, on the contrary, the cheapest and easiest to execute. This is now such a roof - evidence of the wealth of the owners and is extremely rare. At the same time, the fashion for turf coating is growing, since it is environmentally friendly, reliable and beautiful.