(Li.2) Final concrete construction
On more month and the concrete roof is there and so is the tiles and the special Adesia along the roof edges.
It looks like a very heavy construction, but it is not. Floors and roof is partly a special ceramic element, good for isolation and other issues.
On top of the roof is another insolation. Basically the importance of insulation is to keep the summer heat out. The winter is not that cold.
It is a very, very strong construction and quite different from what you see in north of Europe.