It is a new building, moved in July 2018. Solid construction with a wooden gable roof.
Intermediate ceiling: plasterboard, vapor barrier, 20cm mineral wool (+OSB board)
Roof structure: inside plasterboard + vapor barrier, insulation between rafters, foil, roof tiles
Access: insulated pull-down ladder
Rooms below: several bedrooms, bathroom
Ventilation: irregular manual ventilation, now occasionally electrically heated for safety during the first winter and dehumidifiers running (without significant water yield)