A system of thermally insulated roofs based on MORAD AF50 post and beam facade. The system can be used for making structures with various wall shapes and roof slopes of the winter garden. The solutions that improve thermal insulation make it possible to use AD50 system winter gardens all year. The advantage of the system is the option of building a roof supported by a hinge profile on the eaves horizontal beam. The hinge profile allows the roof to be inclined 5-45° horizontally. The eaves beam supports the outer gutter that drains rainwater from the roof. Vertical walls of the winter garden can be built with any MORAD window and door system. Both the rafters and the eaves beam can be reinforced with standard aluminium or steel profiles for increasing the size of the winter garden structure. Glass and cellular polycarbonate roof fillings can be utilised. The range of roof glazing is 16 to 56 mm. The system is supplemented by EPDM gaskets and membranes to ensure appropriate resistance to water and wind, as well as PVC and PE foam insulators for adequate thermal insulation.