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Double Glazing vs Triple Glazing – Is It Worth It to Get That Extra Layer?

(5 min read)

Double glazing or triple glazing? That is the question on many people’s minds when they are thinking of getting their windows replaced. Hopefully, we can help with the double glazing vs triple glazing dilemma.

Your home may be situated on a busy main road, where noise reduction would be a priority for you. Or perhaps you want to eliminate drafts and lower your heating bills? Read on for the facts and figures that will help you make an informed decision for you and your home.

Three counties triple glazed windows

What Is the Difference Between Double and Triple Glazed Windows?

The physical difference between the two types of windows is actually simple, double glazing has two panes of glass whereas triple glazing, as you would expect, has three.

If you were comparing windows in this way the choice would be easy, surely it must be better to opt for three panes of glass instead of two.

But there are many additional differences between how double and triple glazing can benefit your home as well as your wallet.

Energy Efficiency

As many of you will know, one of the biggest reasons to change from single pane to double glazed windows is because of the increased energy efficiency that comes with the additional pane of glass.

So of course with triple glazing, the energy efficiency is increased again. Around a quarter of household heat is lost via windows, so to maximise the insulation here, is crucial to ensure that you are reducing heat loss as much as possible.

Heat loss from your home is measured using a U- value. On average single glazing has a U- value of 5.6, double glazing a rating of 2.8, whereas triple glazing can offer a U- value of 0.8. Easy choice really!

Not only does the extra pane of glass have its role in decreased heat loss, but the additional air gap helps too as it is usually filled with inert gas, such as argon or krypton to keep that lovely warmth inside your home.

However, it is important to remember that upgrading your windows to save energy is only one aspect that will help, energy can be wasted from many areas of the home. You will need to look at the insulation in your loft and roof space, doors and floors to ensure that you don’t waste money by only fixing one problem area.

Noise Reduction

If you live in a noisy, built-up area or on a busy road with heavy traffic, then replacement windows will greatly reduce noise levels. Whilst double glazing does help with noise reduction, triple glazing can achieve superior reductions in noise, but you must bear the following points in mind:

  1. The thickness of the glass is key to sound insulation. By choosing a window with different combinations of pane thicknesses (asymmetrical glazing), you can further increase noise reduction as each thickness of glass will block a different sound frequency. For the best results, the difference in thickness needs to be at least 33%. So for example one pane at 4mm and the second at 6mm. It makes no difference which is placed at the exterior.
  2. The size of the gap between the panes also plays a crucial role, as the larger the gap, the better the noise reduction will be.
  3. Trickle ventilators used on any windows will destroy the noise reduction you may have achieved with any of the above.

If you are weighing up your options between double and triple glazing for noise reduction, it is worth speaking with an expert about your particular situation and the type of noise issue you have. Whilst triple glazing is more effective in many ways it is more expensive and a double glazing solution with correct gaps and glass thickness may be sufficient for you.

Risk of Cold Patches

Damp and condensation is caused when excess moisture in the air comes in contact with a cold surface which then creates water.

Cold patches around the house will occur when there is a greater difference between the U- values of walls or floors in comparison with the windows. Walls have a U- value of around 0.3, so clearly, windows of any type have a long way to go to be as efficient as a wall. With triple glazing being the most efficient with U values between 1.8 and 0.6, this is the best option to reduce cold patches. These cold patches can lead to damp areas and problematic condensation.

Cost Comparison

When comparing any product there will always be a cost implication. As you would expect triple glazing comes with more expensive manufacturing techniques as well as containing more raw materials, so it is the more expensive option.

With both double and triple glazing, you will not see the return on your investment in terms of recouping the money you have spent on them with the reduced heating bills you will achieve going forward.

Choosing triple glazing over double glazing from a cost perspective will be because you really need the optimum in energy efficiency and comfort.

What will it be, double glazing or triple glazing?

As demonstrated there are a number of different pros and cons when it comes to choosing double or triple glazing. So depending on what your biggest requirement or priority is, will determine which window is most suitable for you.

If you are still confused about which option is right for you, call our expert team, who are here to give you a helping hand. Our team can provide you will all the information you need to help find that perfect window solution for your home.

To find out more about our windows contact the team today on 01252 414800

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David Bryant
David Bryant
Very happy with our new door . The support team kept us up to date on everything and the guys on the installation team were early , friendly and professional. Great value all round
Kate Hulbert
Kate Hulbert
Was looking for a new front door, to replace our tragically 80's monstrosity. The Three Counties website was great as i could see and design the door i wanted and then get a quote for it. The sales team was really quick to respond, and not at all pushy. A survey was easily arranged, to confirm sizes etc and the installer turned up precisely on time, was super friendly, efficient, neat and very tidy. Whole process took about 4 weeks, beginning to end, and I now have the door of my dreams! The only downside is my neighbors keep pestering me for details of who did the job. No hesitation in recommending Three Counties.
Nikki Wade
Nikki Wade
I'm very happy with my new conservatory - Mark and David did a brilliant job of the build and resolved any issues I had to make sure everything was finished to a really high standard.
Dominic Blood
Dominic Blood
This is the second time I have used Three Counties , a few years later and in a different house this time. It’s great to see the quality of the windows and workmanship have remained 5*. A stress free installation from start to finish, all windows installed have transformed how our 70s style house looks and now no worries of mould as a result of the old timber framed windows. The Installers who completed our job were amazing, and I mean amazing! Hard working, extremely skilful at their trade, polite and very tidy. Each day when they left they hovered up and left the place in the best condition they could. The whole process from the initial quote , measurements and dealing with the office team before and after the installation has been a true pleasure , if only all businesses were as efficient as this. Highly recommended for anyone considering new windows or any other products they provide and I won’t hesitate to use them again. Thank you Three counties!
Kim Stevens
Kim Stevens
I shopped around and three counties came in at the most reasonably priced, and I used the buy now pay later option. Really happy with my new door and window, which were both fitted in one afternoon. The customer service was very good throughout and everything went smoothly.
I had some windows fitted a few years ago and have recently had a problem with one of the locking mechanism failing. I called 3 Counties, who had a base call out charge, where a lovely lady took my details, refered to my file and we agreed a date when the fitter would come out and inspect the issue. Paul arrived bang on time and was very helpful. He checked the window, confirmsd the issue and promptly fixed it there and then with a replacement part he had on board his van. He was polite and knowledgable. Very efficient. Thank you 3 Counties.
samie dowling
samie dowling
I had new windows fitted and they look amazing, make such a difference. House is much warmer and soundproof! Staff were very professional, done the job so quickly and cleaned up after. Would definitely recommend.
Ywain Martin
Ywain Martin
Excellent service throughout the process. Very happy
Victoria Stone
Victoria Stone
Very happy with our new windows. Fitters were respectful and tidy. From start to finish. Thanks again.