What Causes a Misty Window?
It can be frustrating when the windows of your home or apartment are smudged. Fortunately, it is easy to fix and prevent if you know what causes the issue.
Many people recommend dehumidifiers as a way to get rid of moisture. However, this does not solve the root of the issue that is seal failure.
Moisture Buildup
The most frequent cause of misty or foggy windows is moisture, particularly in older homes that have double- or single-glazed window frames. These windows were designed to stop cold air from entering your home, and keep heat in. However, they could result in condensation and moisture build-up. If not taken care of, this can lead to damage to the glass or glazed surface of your window which could lead to an expensive repair or replacement of the window.
double glazing misting build-up on windows is typically caused by the meeting of cold and warm air. This is more frequent in homes with high humidity levels. However, it can occur if your window seal is damaged or faulty.
Everyday life produces a surprising amount of indoor moisture, each moment you boil water or cook meals adding four or five pints of water to the air. Showers or tumble dryers, and watering house plants all add to the indoor humidity. Even breathing in and out releases little water vapour. This means that the air inside your home is filled with moisture. As it cools it will melt on any surface it comes into contact with including your window.
If you have a double or triple-paned window and you notice condensation in between the panes it is likely that the seal has been damaged or broken. In most cases, there is a spacer between two panes of glass and it is designed to trap any moisture in the space. The spacer is usually invisible but you can identify it by shining a light on the window and looking for streaks or dark spots.

If the spacer is not working, it is not unusual to discover black mould in the area, which is unsightly and a potential health hazard. It can be difficult for mould to get rid of and could cause a discoloration of plaster walls around the window. Left untreated it can also lead to respiratory problems, asthma, and skin irritations.
Condensation
Condensation occurs when warm, moisture-laden air comes into contact with a cooler surface like windows. The temperature changes cause the air's moisture to change into a gas (water vapor) into liquid (water droplets). This is normal, however if you are experiencing frequent condensation, it could be a sign of an issue with ventilation, indoor humidity levels or window quality. Changes to these variables can aid in resolving the issue and keep your windows clean.
Foggy windows are most often caused by the buildup of moisture. If your windows have double or single glazing and a strong seal then moisture from the inside is less likely to get through and cause condensation. However, if your windows are older or have seals that are damaged, or when you live in a humid climate the likelihood of moisture to escape through the cracks around the window.
If the moisture isn't eliminated, it will accumulate on the glass and form a layer of white fog on the window. Fogged windows aren't just unsightly, but they can also lead to numerous issues in the home. Moisture can cause damp spots, which can lead to mould and discolor surfaces such as wallpaper or paint. It can also cause a worsening of existing health issues such as allergies, asthma and respiratory infections.
It is important to address damp as soon as it begins to appear since if it is left untreated it can cause structural damage to your home. It could also encourage the growth of fungal and bacterial infections. It can even lead to the destruction of wooden structures such as flooring and roofs.
You might have heard suggestions like using defogging spray or wiping the windows with shaving cream but these are just temporary solutions. These solutions are designed to remove the moisture, but not solve the issue that's causing the condensation.
Heat Loss
Windows are more than just windows to let in light and connect to the outdoors. They also act as insulation for our homes. Unfortunately, over time they can lose insulating efficiency when seals get damaged. This could lead to the occurrence of hazy windows, which are not just unattractive, but also cause an energy loss that is significant.
If the glass in the double-glazed window is smudged, this means that the seals that seal the panes have failed, and moisture has been allowed in. This can be caused by many elements like sunlight, water, varying temperatures, or even barometric pressure. As time passes, the seals will eventually break down which is why it is crucial to have your double glazed windows replaced immediately you notice any signs of them becoming cloudy.
As the warm air inside your home is brought into contact with the cold glass's surface, it causes condensation to form, which causes the formation of fog or mist on windows. This is because the dew point is located below the cold surface of glass. The dew point is the temperature at which the moisture present in the air transforms into water vapour. Thus, the water vapour from the warmer air is unable to go and so it will fall on the colder surface of your double glazed window where it will remain kept until it evaporates.
Luckily, there are several ways to stop these issues from happening such as using exhaust fans which are designed to vent moisture outside. This can help to reduce the humidity inside your house, which is one of the main causes of misty windows. Also, removing all plants from your windowsill and opening windows as much as possible will also help to balance the humidity levels. If the problem persists it is best to invest in high-quality dehumidifiers that will help keep humidity levels at a minimum and prevent fog or mist from forming on your windows.
In addition, it's also worth investing in energy efficient double-glazed windows if you are looking to replace your existing ones. According to the Energy Saving Trust, old single-glazed windows account for around 25 per cent of heating loss in homes. upgrading your current windows to energy efficient PVC double-glazed windows can reduce this figure by as much as 75 per cent.
Damage to the Glass
Damage to windows is not only unsightly, but it can also affect the overall comfort of an area and draw unwanted intrusions. It's important to understand the root cause of these issues so that you can take the necessary steps to avoid them from happening again.
Misty windows are a common problem, especially in winter. The cause of moisture buildup is usually by poor single or double glazing, which can allow moisture to seep through the glass and frame. This can occur due to a number of factors, including high indoor humidity levels and temperature variations.
Good windows come with frames and glass that is insulated and designed for better energy efficiency. They are usually double-paned, have argon gas and a seal to reduce heat loss. This will save you money on energy bills and make a house more comfortable. Windows that are older and have a single pane might have a range of problems which reduce their effectiveness. They might need to be replaced in order to lower energy costs and improve comfort.
In many cases, people with foggy windows will try to solve the problem by themselves. The most popular suggestion is to place a dehumidifier near the window to eliminate the moisture. This isn't necessarily an excellent idea, but it won't solve the underlying problem which is that the window seals have failed.
A more effective way to clean windows is to use a mix of vinegar and water. This solution can be sprayed on the glass, then wiped using a microfibre cloth or squeegee. Once the glass is dry it can be polished and buffed to remove any streaks or spots.
It is crucial to repair or replace the damaged seals on your windows as soon as possible. This will improve the insulation in your home and will prevent further repairs. Portage Glass & Mirror will take a thorough look at your windows and recommend a plan of action to improve their appearance and function.