In Poland, until 2010, a number of buildings were built with the support structure of roofs in the form of timber trusses connections with punched metal plate fasteners. Standardisation changes, i.e. the introduction of Eurocodes in 2010, resulted in, among other things, increasing the values of recommended climatic loads. Due to the above, in structures built several years ago, the load capacity limit for both timber and fasteners is exceeded. Modernisation of structures with these trusses usually leads to the need to strengthen the existing nodes. The issue of strengthening connections with punched metal plate fasteners is poorly recognised in experimental (failure) tests, and thus there are no detailed standard guidelines. The purpose of the experimental tests was to identify the behavior of the tension connections on metal plate fasteners and to evaluate the impact of the additional reinforcement in the form of perforated plates and screws. The analysis of the obtained results of experimental tests allows us to conclude that the reinforced nodes achieved a much higher ultimate load than the one resulting from the design calculations.