Reliable double -glazed windows with the so many cameras are added to such profiles, which can be considered optimal for the place of its use. There are no shortcomings that will be in the case of ordinary wooden structures. It is not necessary to constantly think about how to insulate such structures so that there are no drafts in winter. In rare cases, it will be necessary to lubricate the pen or some of the elements, but this practice is rare compared to those repairs that will so often be performed for wooden structures.
