This late 17th century church is typical for the baroque constructions of the area (beautifully decorated interior, stucco, frescoes and sculpture of first-rank 18th century artists). Its roof survives virtually unchanged. The special feature of this roof is the lack of a continuous tie-beam. The barrel vault of the nave reaches into the attic. Therefore, the outward thrust of the rafters had to be handled by special means. We will try to figure out what is the load-carrying behaviour of the structure, and we will evaluate some obvious damage encountered. Furthermore, the roof shows very nice traces of the production process.