What is causing foggy windows?

Question

What is the cause of foggy glass in a window? Can this be fixed? Do I simply need to replace the window with foggy glass?

Lee · Accepted Answer

It a breakdown of the double glazed unit, normally happens with age, because of the different weather temperatures, the unit expands and retracts. Causing the silicone edge to split and allow moisture to build up between the 2 panes of glass

Kulwant · Answer

Condensation forms when warm, humid air contacts a cold surface. Moisture is in the air all around us and warmer air can hold more moisture. As air cools, it contracts and its moisture condenses. When the temperature drops, the first place you will see any condensation is on the windows. Your windows are the coldest surfaces indoors. During colder months, indoor air is much warmer and holds more moisture than outdoor air, which is colder and dry. Warm, humid indoor air cools and contracts; as it contacts the cooler windows, the moisture condenses on the glass.

Adam · Answer

If it is inside the unit, then the glass inside has broken down, and not doing its job properly anymore. In this case you are better of changing the unit. Please note you don't need to change the whole window only the glass.

Anthony · Answer

The double glazed unit has broken down you just need to replace with new one

Phil · Answer

If this fogginess is on the outside of glass it’s condensation which is normal on windows when it’s cold in mornings. If the fogginess is in between the glass then the glass unit will need to be replaced.  

Thanks

Lee · Answer

Double glazed units will break down over time, This can either be down to the age of the unit or how the unit was installed.
The good news is you can replace the glass unit and don't need to replace the whole window. Sealed units should cost from £65 upwards all depending on the size of the unit and what type of unit you require ie with leads or Toughned glass ect
Bigger units will cost more and can be between £80-£150, so worth shopping around.

James · Answer

The bond sealing the units has perished, I can replace the entire unit as it cannot be repaired

Kevin · Answer

The seals around the edges of the double glazed unit has failed. This means that the Argon or Krypton gas that was in there has escaped and been replaced by oxygen. Changes in temperatures  between the outside and inside of the house causes condensation to form which dries milky in the sunlight.

Raina · Answer

Your window units are failing and will need replacing , I would recomend replacing the windows with new energy effient window with loe glass ,

Darren · Answer

The whole unit needs replacing

Khashaf · Answer

Hi Joyce unfortunately the seals between the 2 panes of glass perish over time. You will need the glass section replaced with new glass.

What is causing foggy windows?

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