The “Ask a Builder” series is dedicated to answering some of the many questions Fairbanks residents have about building, energy and the many other parts of home life.
Q: How can I keep moisture and ice from forming on my windows in the winter?
A: On really cold days, you might notice condensation forming on the inside of your windows. This can be caused by one or a combination of factors: excess humidity, inadequate ventilation or poor windows. To understand and correct a particular issue in your home, you need to know some basic properties of moisture.
Condensation occurs when water vapor (a gas) turns into water droplets as it comes into contact with a cold surface. The point at which this happens depends on the temperature and humidity of the inside air. The warmer the indoor air, the more water vapor it can “hold,” and moisture can remain in the vapor state. When air moves next to a cold window, the temperature drops and it can’t “hold” as much vapor. That’s when you start to see condensation forming.
For example, if the indoor temperature is 70 degrees and the outdoor temperature is 0, then moisture will begin to condense on a single-pane window when there is roughly 15 percent relative humidity in the house. A double-pane window will cause condensation at about 25 to 40 percent relative humidity, and a triple-pane window at 30 to 50 percent. These are rough numbers based on average window insulation values.
The recommended indoor humidity levels for occupant health and comfort range from 30 to 50 percent. The general rule in a cold climate, however, is to target the lower end of this spectrum because of the risk of condensation within walls and ceilings. If your house has adequate mechanical ventilation, humidity is less of a concern. In Fairbanks, it’s tough to maintain anything close to 50 percent humidity in a properly ventilated house, because the winter air is so cold and dry. Because of its low moisture content, the inherent dryness of Fairbanks winter air is good for homes but not always the occupants, since discomfort related to the dryness can be problematic.
Q: What can I do about it?
A: Three things: Make sure your home is ventilated properly, aim for less than 40 percent relative humidity to keep both you and your home healthy, and consider replacing your windows or adding moveable window insulation during cold months.
If you already use mechanical ventilation and have low interior humidity, but still are having problems, you might need to examine your ventilation setting. If you have a heat recovery ventilator (HRV), it might be recirculating too often, which can contribute to increased moisture buildup in the air. Recirculation mode closes the connection to the outside and brings exhaust air back into the rooms. Recirculation mode keeps the HRV core defrosted and saves energy, but it also is possible for it to run for too long. Some experimentation with the HRV settings might be necessary. For example in 20/40 mode, the HRV brings in fresh air for 20 minutes then recirculates for 40 minutes, and likewise for 30/30. If you’re getting condensation in your current mode, try decreasing the amount of time the unit recirculates.
Also make sure air is allowed to circulate — either passively or mechanically — throughout the entire house. If you close the door to the bedroom, the air can become cold and moist enough to condense on windows.
Older, poorer performing windows can create problems no matter what you do to your interior air. Bad seals around operable windows, metal spacers between the panes, and inadequate insulating value can cause the window surface to get cold enough for condensation to occur. If you’re not ready to invest in new windows, consider some type of moveable window insulation like foam board (on the outside) or well-sealed plastic film (on the inside). A CCHRC guide to different types of window insulation can be found at www.cchrc.org/evaluating-window-insulation.
Ask a Builder articles promote home awareness for the Cold Climate Housing Research Center. If you have a question, contact us at firstname.lastname@example.org or 457-3454.