Pre-stressed reinforced concrete mounting lattice girders are horizontal load-bearing elements that are used to carry roof and oor structures. They can be pre-stressed (adhesive prestressing), or post-tensioned. Thanks to their remarkable load bearing capacity they can cover large spans. Due to their geometric characteristics they are convenient for passing installations, ventilation ducts, installing of dierent equipment etc. Dimensions and shape of the lattice girders are adopted from static calculations and in accordance to the project design requirements. Production of these elements is carried out in the smooth steel formwork with high grade concrete. The RC mounting lattice girders are placed into specially designed column forks, where rigid joint connection is formed by implementation of our system.