In today's World, we are becoming increasingly aware of the anthropogenic impacts on the environment (eg. The problem of climate change), and consequently the environmental acceptability of products becomes more and more important. Various methodologies have been developed to assess the environmental impacts of products, and one of the most widely used is the Life Cycle Assessment (LCA) methodology. With the LCA method we monitor the product through its life cycle and thus obtain data on its environmental impact. The thesis deals with the analysis of the environmental impacts of construction products used in construction sets of flat and sloping roofs. In doing so, we used environmental product declarations or Environmental Product Declaration (EPD) documents. Through the results of the LCA , the EPD provide transparent and comparable information on the impact of construction products on the environment. Construction assemblies were analyzed for the "cradle to the gate" phase of the life cycle. We did three analyzes. In the first, we compared the individual products of the construction set in seven environmental categories (GWP, ODP, POCP, AP, EP, ADPE and ADPF). In the second, the overall composition was compared to each other in all seven categories, and in the third, we simplified the sets according to their environmental impact in a simplified way, and thus obtained the least burdensome construction structure. We found that the materials for supporting structure and thermal insulation contribute predominantly to the overall environmental impact of roofs, but other materials (eg brick roof, steam barrier, etc.) make an important contribution to the environmental impact in certain categories. Endoscope support systems have proven to have less environmental impact in most categories, which suggests that by selecting a supporting structure, the environmental impact can be significantly reduced.