R50 Facade System involves the lidded, semilidded, structural silicon and steel reinforced Facade systems. In case of using facade with slab, it allows constructing a sash without the need of extra casing. It can be used on low-or high-rise buildings. It provides an uninterrupted glass appearance with the option of using as structural silicon Facade, and meets the esthetical expectations. The system allows the hidden sash opening outward. Parallel opening hidden sashes can be constructed with this system according to the users desire.