Why Do Your Windows 'Sweat' and How to Stop Condensation Forever?
Condensation is perhaps the #1 complaint Bulgarian homeowners have during the winter months. Seeing droplets of water on your brand-new windows can be frustrating and worrying. However, contrary to popular belief, “sweating” windows doesn’t necessarily mean the product is defective. In most cases, it is a sign of a physical process related to the humidity and temperature balance in your home.
Why Does Condensation Happen?
In simple terms, condensation occurs when warm, moist air inside a room comes into contact with a surface that is significantly colder (the glass or the profile). The air can no longer hold the moisture, so it liquefies and forms the droplets we see.
The Three Main Causes:
1. Lack of Proper Ventilation
Modern uPVC windows are designed to be extremely airtight to save energy. While this is great for your heating bill, it stops the natural air exchange that older, draftier windows provided. Without ventilation, humidity builds up from everyday activities.
2. High Internal Humidity
Activities like cooking, taking hot showers, drying clothes indoors, and even breathing and having indoor plants contribute liters of moisture to the air every day. If this moisture has nowhere to go, it will settle on the coldest surfaces.
3. Low-Performance Glass Units
If you have older double glazing or a glass unit without a “warm edge” spacer, the internal pane of glass becomes very cold during winter nights. This creates the perfect conditions for condensation to form quickly.
How to Stop the “Sweating”
- The Golden Rule of Ventilation: Open your windows fully for 5-10 minutes three times a day. This “shock” ventilation replaces the moist air without cooling down the walls of your home.
- Upgrade to Triple Glazing: A triple-glazed unit with Low-E glass keeps the internal pane of glass much warmer, often above the “dew point” where condensation starts.
- Internal Climate Control: Use a hygrometer to track humidity; keep it between 40% and 50% for a healthy home.
Understanding the balance between insulation and ventilation is key to a dry and healthy home. If you’re struggling with persistent moisture, contact СОФ ДИЗАЙН for a professional assessment.