Steamed Up Windows – Is it Normal?

Fogging of windows in the home is a phenomenon that usually occurs in the period from autumn to spring. It is mainly related to higher air humidity and large temperature differences inside and outside the building. The evaporation of windows is not a disadvantage, it is a natural process that can be properly minimized.

The condensation of water vapor on the windows and doors on the inside of the rooms is a consequence of the temperature difference between what is inside and outside, as well as high air humidity in the room. This phenomenon is known as the “dew point” – from this moment the process of water vapor condensation begins. It mainly concerns winter periods. It may be accompanied by frost or even the appearance of ice on the inner surface of windows and doors (glass panes, glazing beads, frames, etc.). The cause of this condition is not a defect in the woodwork, but most often inadequate ventilation of the room. Through carefully insulated windows or doors, the air with high humidity generated during everyday household activities (bathing, cooking, washing, etc.) cannot get outside the room and settles on the coolest surfaces, i.e. window panes, doors or metal frames. In order to eliminate this phenomenon, it is necessary to check the proper operation of ventilation. Additionally, the supply of fresh air should be ensured by systematic ventilation of the room.

The following factors influence the phenomenon of water vapor condensation on the inner surface of windows and doors:

-The level of humidity inside the room

-The air temperature outside the building

-The temperature inside the room

-Temperature on the surface of windows and doors

-Ventilation efficiency

Limiting the phenomenon of condensation is possible by acting on four of the above-mentioned factors (no influence on weather conditions). Air humidity should be captured when it is generated and removed to the outside. The room should be systematically heated and ventilated. Thanks to the use of a spacer made of complex insulating material, the so-called “Warm edge”, it is possible to significantly improve the thermal insulation at the edges of the glazing unit. This in turn increases the temperature of the glass panes in this area and reduces the risk of temporary condensation. Periodic appearance of condensation is a normal, temporary phenomenon that cannot be eliminated 100% but can and should be minimized by following the above rules.

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