Problems with moisture on the windows, condensation, humidity | Vimat

Problems with moisture
on the windows

Help, there’s moisture on my new windows!

You have finally replaced your old windows with new, high performance models. When the first winter hits, you notice that there is moisture forming on the glass. You wonder what's going on because you never had this type of issue with your old windows.

Windows performance

One of the key performance factors of windows is their resistance to air infiltration. Depending on the model and the type of opening, your new windows may be much more airtight than your old ones. If they block air infiltration, that means they also prevent exfiltration of air and humidity. In fact, your old windows being less airtight, used to let more air in and out, which helped to eliminate the excess moisture in your house.

So, new windows are not the cause of condensation, but as there is less air leakage, moisture condenses on the glass surface which is colder during the winter.

A very cold winter

Harsh winters are the cause of many worries, and windows are not always spared, even when they are new. When it's very cold outside, even new windows can become cold on the interior surface. The degree may be different depending on wind, orientation and time of day. When humidity condenses on a window that is too cold, it causes frost. It is the same problem of humidity, but increased by the cold’s intensity.

Avoid condensation

Here are some tips to reduce indoor moisture in our daily lives:

  • Use the range hood when cooking food, and boil only the amount of water that you really need.
  • Start the bathroom fan when bathing or showering.
  • Limit the time spent in showers and baths.
  • Avoid drying clothes indoors.
  • Make sure your dryer vents moisture outdoors.
  • Do not let firewood dry indoors, even in the basement.
  • Facilitate airflow around windows by opening curtains and blinds.

Other factors

If condensation is excessive in your home, there may be other factors involved:

  • A humid basement;
  • A humid crawlspace;
  • The range hood or bathroom vent is partially or completely blocked.
  • The air humidity outside is very high.

Excess humidity and condensation in a home can lead to the formation of harmful mold, and this problem should be taken seriously. It is always recommended to maximize air circulation in a house, even if you have an air exchanger. Otherwise, you can install fans in the most problematic areas. A dehumidifier can also be very effective.