The curtain walls can be used, as well as in new buildings, also in renovations. They are useful to replace or create new volumes and to change the constructive pre-existing look. Their aesthetic features allow buildings a modern desing of great architectural impact, with special glass, stone or composites elements. The coatings in aluminum and glass allow thermal and acoustic comfort, greater lightness of the interior as well as solutions for the exploitation of the solar energy, the so-called integrated photovoltaic.