What is causing foggy windows?

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?

Asked by Joyce on 10th Sep 2020
Expert Trade Answers
Best 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"
Answered on 10th Sep 2020 - Member since Aug 2020 - report
"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."
Answered on 16th Oct 2020 - Member since Sep 2020 - report
"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."
Answered on 22nd Oct 2020 - Member since Oct 2020 - report
"The double glazed unit has broken down you just need to replace with new one"
Answered on 10th Sep 2020 - Member since Aug 2020 - report
"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.

Answered on 10th Sep 2020 - Member since Feb 2020 - report
"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."
Answered on 10th Sep 2020 - Member since Dec 2019 - report
"The bond sealing the units has perished, I can replace the entire unit as it cannot be repaired"
Answered on 10th Sep 2020 - Member since Sep 2020 - report
"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."
Answered on 11th Sep 2020 - Member since Sep 2019 - report
"Your window units are failing and will need replacing , I would recomend replacing the windows with new energy effient window with loe glass ,"
Answered on 13th Oct 2020 - Member since Jan 2020 - report
"The whole unit needs replacing"
Answered on 22nd Oct 2020 - Member since Sep 2016 - report
"Hi Joyce unfortunately the seals between the 2 panes of glass perish over time. You will need the glass section replaced with new glass."
Answered on 10th Sep 2020 - Member since Mar 2020 - report
Find Tradespeople, compare up to 3 quotes!
It's FREE and there are no obligations
Ask a Trade
Got a question that only a tradesperson can answer? We have thousands of trades ready to answer any question you may have.
Ask your question
Ask a Trade

Are you looking for advice on a DIY project or have a question for our tradespeople?

We'll email your question to tradespeople who are skilled in your chosen category.

Your question will be made public - please do not include any personal details.

{{ first(ask.errors)[0] }}

By continuing you agree to the Community Guidelines.

Report Content

{{ first(reportForm.errors) }}

Thank you

Your report has been created and will be investigated shortly.

Ready to get a price for your home improvement project?
Get started

Over 1 million homeowners and over 50,000 tradespeople
use MyJobQuote nationwide each year