Dew point: Why do our windows dew and how to prevent it?

Why are our windows dewy?

Window dew is caused when moisture from the surrounding air precipitates on a cool surface (such as the window glass). This phenomenon usually occurs when the humidity indoors exceeds a certain threshold and the windows are not sufficiently insulated.

What is the dew point?

The dew point is the temperature at which water vapour in the air begins to convert to liquid. If the surface temperature drops below this value, condensation - visible dew - will form at that point.

Determining the dew point in practice:

Example: if you have a room temperature of 20 °C and a relative humidity of 60 %, the dew point will be approximately 12 °C. If the surface of the window reaches this temperature or is lower, it will start to dew.

How does the dew point manifest itself in everyday life?

The most obvious example of a dew point is window dew. However, this phenomenon can also occur in other places, such as walls or poorly insulated corners of rooms.

Does dew point affect the quality of housing?

Yeah. Excessive window dew can lead to:

• deterioration of air quality,
• increased risk of mould,
• damage to windows and furniture in the vicinity of condensed moisture.

Factors that contribute to window dew

1. High humidity - for example, drying laundry indoors.
2. Insufficient ventilation - the air does not move and moisture accumulates.
3. Poor insulation - old windows or poor quality facade insulation.

How can the wrong solution lead to mould?

If you do not pay attention to the dew point problem, moisture will gradually settle on the walls and in the corners of the rooms. The result is mould, which can cause health problems and damage your interior.

How to prevent window dew? Practical advice and solutions

1. Proper ventilation - Ventilate briefly but vigorously. The ideal is to open the windows wide for 5-10 minutes several times a day.
2. Quality insulation - Invest in modern insulated windows and facade insulation to minimise heat loss.
3. Optimum humidity - Keep humidity at 40-60%. Dehumidifiers or ventilation systems can help.

TIP: The best solution from Kunaj

Modern insulating glass, low-emission glass and triple glazing minimise condensation and increase your living comfort.

Dew point and humidity monitoring

Modern technology allows you to monitor dew point temperature and humidity in real time. Smart sensors and thermostats help you quickly identify the problem and prevent it from escalating.

The most common mistakes to avoid

1. Replacing windows without addressing damp - new windows alone will not solve the problem.
2. Curtains and furniture near windows - they prevent proper air circulation and increase the risk of dew.

Benefits of an efficient dew point solution

• A healthier, mould-free environment.
• Longer window life.
• Lower heating costs thanks to better insulation.
• Better indoor air quality.

Frequently asked questions about dew point and Kunaj windows

Why do my windows dew even after replacement?
New windows can be tighter, so addressing ventilation and moisture is key.

How do I know that my wood-aluminum windows a wood windows have good insulation?
Check that you have triple glazing and that the façade meets insulation standards.

Entrust your windows to the experts and enjoy comfortable, worry-free living! With solutions from Kunaj you will ensure your home's health and comfort.

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