When combined with the additional water vapor (moisture) from showers, cooking, or from clothes dryers not vented to the outside, the result is excess moisture and a high relative indoor humidity level. Good windows and insulation all create barriers to the air exchange of a home. So if you didn’t have as much condensation before replacing your old windows, it’s probably because they were drafty. Older window designs were less efficient and consequently allowed moisture to escape. Just as energy-efficient designs and weather-stripping keep cold air outside, they also keep warm moist air inside. The insulation and construction materials used today are cleverly designed to keep cold air outside. The reason you may observe more condensation in your home is because of modern energy-efficient home building methods and products. Glass is usually the first place you notice condensation because glass surfaces have the lowest temperature of any surface in a building.

Mould is an unwanted intruder in your home, where prevention is much easier than fixing an existing problem.Ĭondensation is not caused by faulty windows. Just like that mirror, the inside or outside of your window can sweat or fog because of temperature differentials.Ī little moisture on your windows means that your windows are keeping you insulated from the outside elements, but if your windows are consistently too wet, this moisture could result in mould growth. An example of this is when a bathroom mirror “steams up” after a hot shower. Condensation is formed when warm moist air comes in contact with cooler dry air. Water or frost on windows is condensation. Learn the causes and cures to manage condensation in your home. While there are benefits to an energy efficient home, one of the unwanted side effects is that it provides the perfect conditions for condensation to form. In older construction, where heat could escape to the outside and homes were not sealed as well, it was harder for condensation to form. It’s a common problem, and one that has become more prevalent as modern building methods produce increasingly airtight homes. Window condensation occurs when the warm air inside your home meets the cold glass of your windows.

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