What Causes a Misty Window?

When windows in your house or apartment get clogged up, it can cause a lot of frustration. Fortunately, it is easy to stop and fix when you know the cause of the problem.

Many people recommend using dehumidifiers to eliminate the moisture. This does not fix the root of the issue the cause is a seal failure.

Moisture Buildup

Moisture is the most common cause of misty windows, particularly in older homes with double or single glazed window frames. These windows were designed to keep cold air from entering your home, while keeping heat inside. However, they can cause 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 a more costly repair or replacement of the window.

The formation of moisture is usually caused by cold and warm air colliding and causing moisture to form on the window. This is more common in homes that have high levels of humidity. However, it can occur if your window seal is damaged or broken.

Everyday living generates a surprising amount of indoor water, with every moment you boil water or cook meals adding four or five pints to the air. Showers, 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 and when it cools down it will melt on any surface it touches 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. Most likely, there is an opening between two glass panes and it is designed to suck any moisture that might be in the space. The spacer is usually invisible, but you can spot it by shining a light on the window and searching for dark streaks or dark spots.

If the spacer is not working, it is not unusual to discover black mould in the region, which is visually unattractive and could pose a health hazard. The mould can be difficult to remove and it may affect the plaster walls around the affected window. Left untreated it can also lead to respiratory problems, asthma, and skin irritations.

Condensation

Condensation occurs when warm moist air comes into contact with a cooler surface like windows. The temperature change causes the water in air to transform from a gas into a liquid. This is normal, however if you are experiencing frequent condensation, it could be a sign of a problem with ventilation, indoor humidity levels or window quality. Changing these factors may aid in resolving the issue and keep your windows clean.

Windows that are sagging with condensation are usually caused by moisture buildup. If your windows are double or single glazing and a strong seal then moisture from the inside is unlikely to leak through and cause condensation. However, if your windows are older or have seals that are damaged, or if you live in a humid climate the likelihood of moisture to escape through the gaps around the window.

If the moisture isn't removed it can build up on the glass causing fog to appear on the misted windows near me and suggest an action plan that will improve their appearance and function.