Window Condensation

The buildup of condensation on windows can lead to moisture accumulating in the window trim, contribute to mold growth, and damage the window frames and finishing. All movable parts of a window more or less allow air to pass through. To prevent condensation from collecting on window surfaces and escaping outside, condensation drainage spaces are created. If these spaces become blocked, condensation can accumulate inside the frame. In such cases, the trapped water can seep into the interior of a building and, in cold weather, freeze and potentially damage, deform, or even break the window.

Why Does Condensation Form?

Window condensation often occurs in cold weather when the interior of a building is warm, and the outside is cold and humid. This can lead to discomfort and inconvenience as condensation droplets can obscure the window, hinder visibility, and create moisture-related issues indoors, such as mold or mildew.

Causes of Condensation:

• Excess humidity in the air.
• Warm, moist air coming into contact with colder surfaces.
• Indoor humidity levels.

How to Reduce Excess Humidity:

The most effective and quickest way to reduce indoor humidity is to ventilate by opening windows widely. Modern windows and doors should be ventilated 3-4 times a day for 10-15 minutes each time, with an additional 15-20 minutes in the morning, especially in bedrooms and bathrooms, as well as in the kitchen after cooking.

Recommendations:

• When ventilating, adjust the heating system to minimize energy losses.
• After taking a shower or bath, cooking, and after meal preparation in the kitchen, close the doors and ventilate the area.
• Consider installing air inlet devices, leaving a gap between doors and floors, or using special air-permeable grilles at the bottom.
• Avoid drying laundry on radiators near windows, as evaporating water can condense on the glass surface.
• Limit the number of plants in your home, as excessive plant density can increase humidity.
• Reduce indoor humidity sources when outdoor temperatures drop.
• Periodically check if the drainage holes for window condensation are not blocked by dirt or debris.

For more information: https://www.doleta.lt/files/Main/files/Rules%20for%20the%20use%20of%20windows%20and%20doors.pdf