Doors that are made by an inexperienced specialist. If the “specialist” makes only the appearance of such a door without all the correct calculations, then it can eventually wait for trouble. This, first of all, is that a very tightly driven panel in the dry period of summer can simply crack in half, and in the fall, during pouring rains, it, very swelling, can skew or break the frame. It is for this reason that you need to be sure when buying a door that the manufacturer itself has already sold at least a thousand of its doors, and moreover, that it has not recorded ages.