The economical use of heating and heat has gained importance in the use of ever-decreasing world energy resources. By using heat-insulated aluminum joinery in buildings, heat leakage from heated spaces is reduced. In addition, since the inner surfaces of the heat-insulated joinery are not cooled by thermal insulation, there is no condensation of the water vapor in the interior. Even in fixed windows, the air leaking between the glass and the frame is not negligible. Also, this leak increases as the building gets higher. The fact that the conditions are very different requires examining many details in the insulation technique to be applied in joinery. Unlimited shaping and design possibilities of aluminum provide economical solution of very complex insulation details.
