Renovation supporting wooden construction structures of the historical buildings invoke a lot of questions. One of the problems are for example massive wooden supporting frames with large span over the irregular ground plan and with high loads. This boundary conditions and dimensions leads to use of technology improving strenght properties of profiles, decreasing bending or reduction of dimensions. This case is showed on the renovation roof frames of the Old Stable of the Vitkuv Kamen castle. The inner carbon fiber strip was used for strenghtening of massive wooden frames.