The roof structure of the 17th century Skokloster castle has recently been restored. The task of finding a solution to the restoration of the timber structure was delicate, as: (a) the roof structure has a highly complex structural behaviour; (b) Skokloster Castle is of remarkably high cultural value; (c) Skokloster Castle has a specific role in Swedish restoration history, as it contributed in the 1960s and 70s to the establishment of a new ideological approach, characterised by the ambition to make as gentle interventions as possible; and (d) successful restoration required methods that would allow for close collaboration and dialogue between the engineers, the architect and the craftsmen. The roof structures were documented by traditional measuring techniques and with laser scanning techniques. Comparative studies of European baroque roof structures were carried out. Modelling and FEM analysis were undertaken to assess the structural behaviour and to design restoration measures. The simulations made using FEM were also combined with visualisation to support the dialogue between the engineers, the architect and the craftsmen. The design of the roof structure has similarities with comparable 17th century roof structures in central European countries, but without some of their qualities. The structure had poorly designed corners, causing weaknesses in the structure. Restoration measures carried out in the 1970s were found to be ineffective. The solution involved an amelioration of the original design, based on designs found in 17th century literature as well as in archetypes found in Romanian Baroque roofs. © 2019, RILEM.