Abstract: In order to obtain frames, in particular for windows, that without excessive depths of construction provide insulating values approximately the same as those of the insulating panes, a mechanically stable frame is disclosed, having a full thermal break between inner (5) and outer frames, without any heat bridge. For that purpose, both frames are composed of inner and outer continuous parts (6 and 9, 18 and 21) between which is laid an insulating element (7, 20) capable of receiving and transmitting mechanical forces. The pane (4) to be mounted in the inner frame (5) is also thermally insulated from the frame parts (6, 9, 12) by means of lip seals (11, 13). In order to seal the gap between the inner (5) and outer (15) frames, at least one further lip seal (22) is provided.