Method of producing a vacuum insulated glazing unit comprising the steps of: - providing a first and second substantially parallel panes of glass (2, 3), a plurality of pillars and a peripheral seal provided between the first and second panes (2, 3), where in the first pane there is provided an evacuation hole in an outer surface for evacuating a void formed between said panes through the evacuation hole to a pressure less than atmospheric pressure; - providing on the first pane a supporting structure, an evacuation tube and a tube soldering material, wherein the supporting structure rests on the first pane and extends over the opening of the evacuation hole, and a proximal end of the evacuation tube rests on the supporting structure so that the position of the evacuation tube in the direction perpendicular to the outer surface of the first pane is defined by the supporting structure, and so that the proximal opening of the evacuation tube is in correspondence with the evacuation hole, the evacuation tube having an outer diameter (Dtube) which is less that the smallest internal diameter of the evacuation hole; - heating the tube soldering material to a condition where it will flow, while the evacuation tube, the supporting structure as well as the first glass pane substantially maintain their mutual positions, and - subsequently cooling the tube soldering material to a solid condition so as to provide an gastight tube seal preventing passage of gas through the evacuation hole except via the evacuation tube, and so that a tube seal material bonds to the evacuation tube; - evacuating the void through the evacuation hole and the evacuation tube; and - heating a distal tip of the evacuation tube so as to seal it off; wherein the supporting structure is provided as shape-stable at a melting point of the tube seal material. - providing a first and second substantially parallel panes of glass (2, 3), a plurality of pillars and a peripheral seal provided between the first and second panes (2, 3), where in the first pane there is provided an evacuation hole in an outer surface for evacuating a void formed between said panes through the evacuation hole to a pressure less than atmospheric pressure; - providing on the first pane a supporting structure, an evacuation tube and a tube soldering material, wherein the supporting structure rests on the first pane and extends over the opening of the evacuation hole, and a proximal end of the evacuation tube rests on the supporting structure so that the position of the evacuation tube in the direction perpendicular to the outer surface of the first pane is defined by the supporting structure, and so that the proximal opening of the evacuation tube is in correspondence with the evacuation hole, the evacuation tube having an outer diameter (Dtube) which is less that the smallest internal diameter of the evacuation hole; - heating the tube soldering material to a condition where it will flow, while the evacuation tube, the supporting structure as well as the first glass pane substantially maintain their mutual positions, and - subsequently cooling the tube soldering material to a solid condition so as to provide an gastight tube seal preventing passage of gas through the evacuation hole except via the evacuation tube, and so that a tube seal material bonds to the evacuation tube; - evacuating the void through the evacuation hole and the evacuation tube; and - heating a distal tip of the evacuation tube so as to seal it off;