Insulation panels made from glass or rock wool are used for noise, fire and heat protection, are highly flexible and adapt to uneven exterior walls. The insulation panels are mechanically fixed by insulation anchors. By using dowels with depth stop limiting thermal bridges are avoided. Atachment wiht adhesives is permitted only in exceptional cases. Insulation of window frames: with only minimum thicknesses of insulation in narrow frames mold formation is favored. Remedy can be made by customized plug-in frames or prefabricated frames.