What Causes a Misty Window?
It can be a hassle when windows in your home or apartment fog. It is simple to fix the problem and prevent it from happening again if you know the cause.
Many people suggest using dehumidifiers to remove the moisture. This doesn't fix the root of the problem, which is seal failure.
Moisture Buildup
The most common cause for foggy or misty windows is condensation, especially in older homes that have double- or single-glazed window frames. These kinds of windows were made to keep the heat in your home while preventing cold air from getting in, but they can also lead to condensation and moisture accumulation. If not properly checked, this could result in damage to the glazed or glass surface of your window which could result in the need for a more expensive repair or replacement of the window.
The accumulation of water on windows is typically caused by the collision of cold and warm air. This is frequent in homes with high humidity levels However, it could also occur in the event that the seal of your window is damaged or defective.

Every day you add 4 to 5 pints of moisture to the air each time you boil or cook your water. Showers or tumble dryers, and watering house plants all add to the indoor moisture. Even breathing in and out creates a small amount of water vapour. This means that the air inside your home is saturated with moisture. When it cools down, it will liquify on any surface it meets including your window.
If you have a double- or triple-paned glass and notice condensation between the panes it is likely that the seal has been damaged or broken. In most cases, there is an opening between two panes of glass and is designed to trap any moisture that may be in the gap. The spacer is usually invisible but you can identify it by shining a light on the window and searching for streaks or dark spots.
When the spacer fails it is not uncommon to find black mould in this region, which is visually unattractive and could pose a health risk. The mould is difficult to get rid of and can also discolor the plaster walls surrounding the window that is affected. If not treated, it could cause irritations to the skin, respiratory problems and asthma.
Condensation
Condensation occurs when warm moist air comes into contact with a cooler surface like a window. The temperature change causes the water in air to change from a gas into a liquid. This is normal, however when you notice frequent condensation it might indicate an issue with indoor humidity, ventilation levels or windows' quality. Changes to these variables can help you resolve the issue and keep your windows clean.
Windows that are sagging with condensation are usually caused by condensation. If your windows have double or single glazing and a good seal then moisture from the inside is less likely to escape and cause condensation. However, if your windows are old or have seals that are damaged, or when you live in a humid climate, moisture is more likely to escape through the gaps around the window.
If the moisture is not removed, it could build up on the glass, forming an opaque white fog on the window. Fogged windows can cause more than just an unattractive appearance. They can also cause numerous problems within the home. Moisture can cause damp spots, which can lead to mould and discolor surfaces such as wallpaper or paint. It can also cause health issues such as asthma, allergies and respiratory infections.
If you notice dampness in your home, it's essential to take care of it as soon as you can. In the absence of treatment, it could cause structural damage. It can also promote the development of fungal and bacterial infections. It can even lead to the destruction of wooden structures, such as floors and roofs.
Some have suggested using defogging or shaving cream to clean the windows, but these are temporary solutions. These solutions are designed to eliminate the moisture, but not solve the issue that causes the condensation.
Heat Loss
Windows are more than just windows to let in light and connect to the outside. They also serve as insulation for our homes. Unfortunately, over time they may lose their insulation when seals get damaged. This can result in windows that are misty that are not just visually unattractive, but also contribute to a significant loss in energy.
If the glass in the double-glazed window turns misty, it means that the seals between the panes are not working and that moisture is being allowed to enter the space. This can be caused by many factors, including sunlight, water, changing temperatures, and barometric pressure. As time passes, these seals will eventually fail and that's why it is essential to have your double glazed windows replaced as soon as you notice any signs of them becoming misty.
When the warm air in your home reaches the cold glass surface, condensation forms which results in fog or mist appearing on the windows. The reason this happens is because the cold side of the glass is below the dew point of the surrounding air. The dew point is the temperature at which moisture in the air turns into water vapour. Therefore the water vapour in the warmer air has nowhere to go and so it will fall onto the colder side of your double glazed window where it will remain trapped until it evaporates.
Fortunately, there are many methods to prevent these issues from happening, such as exhaust fans that are designed to let the moisture out. This can help to reduce the humidity in your house, which is one of the primary reasons for misty windows. Also, removing all plants from your windowsill and opening your windows as much as possible will also help balance humidity levels. If the issue persists however, it might be best to invest in a top quality dehumidifier. It will help to maintain a low humidity and prevent fog or mist from forming on your windows.
If you're looking to replace your windows, it's also worth investing in double-glazed windows that are energy efficient. According to the Energy Saving Trust old single-glazed Windows account for around 25% of heat loss in homes. Moving your windows to energy efficient PVC double-glazed windows can reduce this by as much as 75 percent.
Damage to the Glass
Window glass damage isn't only unsightly, but it can also impact the overall comfort level of the building and also attract unwanted intruders. It is important to know the root causes of these problems so you can take steps to avoid them from happening again.
A common problem is misted windows, particularly in winter. The reason for this is by inadequate double or single glazing, which allows moisture to seep through the frame and glass. This is caused by many factors, including high humidity in the indoors and temperature fluctuations.
Quality windows have frames and insulated glass designed to be more energy efficient. They are usually double-paned, and come with an argon gas seal and to limit the loss of heat. In time, this will aid in reducing energy bills and make a home more comfortable. However, windows that are older and have single panes may have a myriad of issues that reduce their effectiveness and could require replacement to lower energy costs and improve home comfort.
In misted units of cases, people who have windows that are cloudy will try to solve the problem by themselves. It is commonplace to suggest installing a dehumidifier near the window to try to remove excess moisture. This isn't necessarily an excellent idea but it will not solve the underlying problem which is that the window seals aren't working.
Water and vinegar are great ways to clean windows. This solution can be sprayed over the glass and wiped down using a microfibre cloth or squeegee. Once the glass is dry, it can be polished and buffed to eliminate any streaks or spots.
It is essential to repair or replace damaged seals on your windows as fast as you can. This will increase the insulation of your home and prevent future repairs. Contact the experts at Portage Glass & Mirror to inspect thoroughly your windows and to recommend an action plan to restore their appearance and function.