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So many adverts and websites now talk about steamy, misty and foggy double glazing, but what does it actually mean and what can be done to stop it? A man in the know Dave Pearson explains.

Double glazed windows and doors are a common feature in UK homes and many UK double glazing installers now rely on the repair replacement market as well as new installations as part of their daily work.

Double (or triple) glazed windows and doors consist of the solid upvc, aluminium or timber frames with double glazed units slotted into them. Double glazed units use 2 pieces of glass separated by an air or gas filled space, and are sealed to stop air and moisture getting into the space.

When the seal is broken the results can be water condensation forming in the space between the glass hence the description ‘steamy, foggy, misty double glazing’.

Swindon based double glazing specialist Dave Pearson explains “the seal breaking is usually down to the effects of expansion and contraction over time caused by the elements. The spacer bar between the 2 panes contains a desiccant which absorbs some moisture but this soon becomes saturated and condensation really takes hold making it difficult to see out. It also looks untidy”.

An effective solution to the so called misty, steamy or foggy double glazing problem is simply to have the offending double glazed units replaced – not the frames, just the double glazed units. I would recommend replacing them with A rated double glazed units” said Mr Pearson.

The BFRC Scheme is the UK’s energy efficiency rating system that uses letters A to E (with A being the best) and traffic-light style colour coding to indicate how well windows will perform in terms of keeping the heat in, keeping the wind and drafts out, resisting condensation, and sound insulation.

“It’s like the energy rating symbols you see on new fridges and freezers” said Mr Pearson. “Getting A rated replacement double glazing is obviously going to help make your home more energy efficient which could mean lower energy bills as well as helping the environment”.

For more information about how you can have your foggy, misty, steamy double glazing replaced by new A Rated glass call Dave Pearson on 01793 790 754 or visit and

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