(UNI EN 1027 - UNI EN 12208)
The ability of a window to resist water infiltrations, even in the presence of a pressure difference between inner and outer pane surfaces. The test method specified by the regulation is conceptually identical to that of air permeability, except that, in the water resistance test, the external surface of the window pane is sprayed with water.
Depending on the pressure reached before the infiltration occurs, the frame is classified according to regulation UNI EN 12208, which provides up to nine classes of performance (also depending on the product’s level of exposure) - 1, 2, 3, 4 , 5, 6, 7, 8, 9 (method A or B). The highest classification of water resistance performance is class 9.
Doc Legno windows (Item 56, Item 68) belong to class 9A.