How does Double Glazing Work?

Posted on December 16, 2016

A house with single glazed windows is becoming something of  a rare sight these days, as double glazing became standard in new builds in the 1980’s and replacing windows became a popular choice. Here at Glevum we started in 1984 – the year that Band Aid were number one – with “Do they know it’s Christmas”.

If you remember Band Aid the first time round then you may just remember mornings of waking up to freezing temperatures with condensation streaming down the inside of the windows.

Thanks to double glazing, this is now a thing of the past. But how exactly does it work and what are the benefits?


The Workings of Double Glazing

Double glazing units are made up of two panes of glass separated by a spacer bar. A gap of up to 16mm filled with either air or argon, krypton or xenon gas lies between the two panes and increases the level of insulation provided by the windows.

The air or gas creates a barrier due to the fact that it does not have enough room to circulate, making it a very poor heat conductor. This reduces the amount of warmth that passes through the windows, so keeps the room warmer for longer.

Benefits of Double Glazing

There are various benefits of double glazing, starting with a reduction in energy costs and of course a warmer, more comfortable house to live in.

  • Energy Costs: While it can take some years to gain back the amount you invested in double glazing, you will instantly notice a reduction in your monthly energy bills.
  • Comfort: Double glazing will create a warmer and more comfortable house to live in. The frustrations of heating a house to still feel cold will be gone and you will be able to enjoy a cosier home.
  • Environment: Installing double glazing has a significant positive effect on the environment. Heating less will produce less carbon dioxide, leading to a lower carbon footprint.
  • Reduction in Noise (from the outside at least!): You will also notice a reduction in the amount of noise you hear from outside your home. This is of most benefit to those living on busy roads with large amounts of traffic.
  • Increased Capital Value: Capital value will be increased when selling a house if it is double glazed throughout.
  • Bye bye condensation: Double glazed windows create very little or no condensation due to the added insulation.
  • A More Secure Home: Finally, double glazed units are much harder for intruders to get through, meaning the security of your property will be heightened.

What Decisions need to be made?

Hasty decisions should not be taken when installing or changing double glazing throughout your home. There will be many decisions to be made, some of which you will need professional advice for from experienced providers.

The Type of Glass:  There are various different types of glass and your double glazing firm should be able to guide you through the options.

The Type of Frame:  When it comes to frames, aesthetics can play as much a role as the technical side. UVPC is the most common, long-lasting, easy to maintain and recyclable.  Some companies still install wooden double glazing but this comes of course with an ongoing need for maintenance.

Service, quality of work and experience can be harder to gauge though recommendations and customer satisfaction scores from sources like The Best of Gloucester give a good indication.

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Satisfied Customers

"We are new to the area and so needed to find a new company to install our new bi-fold doors. The website was clear and easy to navigate. And it was easy to get someone out to see us for a chat and to make sure we could do what we wanted."

K Jemma (Lydbrook) - June'21

"Efficient, friendly. This is the third time I have had windows fitted by Glevum."

K Lindesay (Cirencester) - May'21

"Brilliant start to finish with just one or two hiccups but these were resolved with very personal service. The issues we had were outside Glevums control and they worked with us to resolve them."

H English (Caldicot) - May'21

"The whole experience was far less stressful than we anticipated. The Team (Gavin and Luke) worked efficiently, quickly and were careful to maintain the COVID precautions. We were impressed with their professionalism and the speed at which they completed the job. Basically, an excellent service which we can happily recommend to our friends!"

T Robson (Gloucester) - April'21

"The whole process from start to finish has been so much more straightforward and efficient than I was expecting. Top class company and I am delighted with the quality of the windows, workmanship and care and attention to making it all happen so smoothly. Wish we had got the windows changed years ago!"

H Saunders (Gloucester) - April'21

"From my initial enquiry to the first visit by Mr Rose all was carried out extremely promptly & professionally... Matt & Scott have done a super job and I am very pleased with how my new bay windows look. I would not hesitate to recommend GLEVUM."

B Pickstock (Cheltenham) - March'21

"Excellent - very professional and courteous. The work was carried out to a very high standard. They kept all surrounding area covered to minimise dust etc. We had a couple of hiccups but they were rectified immediately and the after care cannot be faulted. Timing keeping was spot on. I would definitely use them again and would not hesitate to recommend to others."

L Longley (Gloucester) - March'21

"I was very satisfied with my experience. Having dealt with a number of other local and National companies I felt that Glevum’s quote was competitive and I preferred dealing with them."

J Knox (Gloucester) - Feb'21

"Excellent product and service."

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