Before we can build the rooms on the first floor, we have to tighten all the places on the roof and between the 2 houses, before bad autumn weather makes its apparition. It's not an easy work, because you have to connect a twelve-sided construction with a square one. You can see more about the exterior construction here.
The first floor has a sky light in plexi-glass on the outer roof, which has to be insulated before winter. In the inner roof a triple glazed window has now been inserted after having insulated the space between the outer and the inner roof.