The master's thesis is dedicated to the development of thermally insulating fittings for brick construction with integrated thermal insulation. In the theoretical part of the thesis are summarized legislative regulations for building construction, the technical requirements for insulation and ceramic products. Furthermore is here described the production of ceramics and technology of filling the ceramic fittings with interated insulation. The practical part of the thesis deals with new possibilities of filling the bulk ceramic fittings with thermal insulating materials based on polyurethane foams in order to improve their thermal insulation and mechanical properties. In the conclusion of this master thesis is an overall evaluation of taken measurements, the filling technology and comparison of new fittings with the current market and their potential use.