In case you were wondering if we were still roofless: no we aren't, but there is still a lot of work to do. But the most important thing succeeded: tearing down and building a new roof structure in a stretch of dry winter weather. Pheww, that's a big relief. We were so lucky as the works took several extra days than anticipated thanks to the poor state of the shared walls. So the supporting structures had to be studied and modified before the roof structure could rise. Fortunately enough, the dry weather continued.
Now we hope to continu quickly with the insulation of the roof and the tiling of the roof. Afterwards we need to do all the reconstruction of the rooms on the inside...to be continued.