Before installing any plastic window, special attention should be paid to the surface of the plastic. This surface should be exclusively white and have a glossy base. As a rule, the standard window thickness is 33 millimeters. If future windows are attached in places where the balcony is located, then do not overpay, purchase windows of the European standard equal to 24 millimeters. After all, in the future, the balcony will be glazed.