For the purpose of my thesis I have used a glass chords for retrofitting stone masonry wall already damaged through previous testing campaigns. The wall had typical shear damages, which were first restored by linear grouting with cement mixture. In the first part of the diploma thesis I have studied appropriate test set-up for testing bond strength between glass chords and substrate. Later on I have tested two types of stone in combination with three types of mortar and determined different failure modes. All tests were conducted in a laboratory of the Faculty of civil and geodetic engineering in Ljubljana. Following couple of unsuccessful attempts a decision was made to determine bond strengths between mortar and stone by performing so called pull-out test. For this purpose stone samples needed adequate preparation and a glass chord with a diameter of 6 mm was built into them. During testing I have monitored pull-out force, movements and a type of fracture. Epoxy mortar, which showed the best bond strength among the tested ones, was then used in the second part of the diploma thesis, namely at shear retrofitting of a stone wall. Before retrofitting the wall, it needed adequate preparation. Perpendicular to a wall direction I have drilled holes and emptied horizontal joints between individual rows of stones to a certain depth. For placing in glass chords we have chosen epoxy system, which included basic epoxy primer, epoxy resin for impregnation, epoxy resin of middle viscosity for filling boreholes and epoxy mortar. Following cyclic shear loading of a wall and data processing, a comparison of obtained results with the test results of two non-retrofitted walls carried out through previous testing campaigns was made. For retrofitted wall maximal obtained horizontal movements were significantly bigger than for non-retrofitted ones. For non-retrofitted walls following the achieved a maximal force resistance started to decline, while for a retrofitted wall it was constantly increasing. Both non-retrofitted walls that were tested under the same boundary conditions as a retrofitted one had typical shear damages (cracks). On the other hand, a retrofitted wall at the same levels of displacement practically stayed intact.