Craig Johnson Expert View: Breaking down double glazing


I’m back on the (writing) tools and this week i thought i would take things back to basics. Not to suggest for one moment that double glazing is basic, but I want to share with you the fundamentals of double glazing.

What exactly is double glazing?

Yes, it’s two panes of glass, rather than one. Yes, it keeps your home cool in summer and warmer in winter. Yes, it reduces noise pollution…

But how?

When renovating – or thinking about updating your windows and/or doors – it’s easy to get distracted by the above benefits of double glazing (and I must admit, I’m guilty of shouting them from the rooftops!). But how exactly does double glazing work?

I’ll break it down for you; simply and easily. No pony! Just the facts, so you have the information to help you make an informed decision about whether to install double glazing in your Melbourne home.

Here we go…

Each double glazed window is a sealed unit consisting of two panes of 4mm-thick panes of Low-e Coating glass, which are joined together by a 20mm super spacer bar and subsequently filled with Argon gas (overall, front to back measurement is 28mm). This is the optimal specification for max thermal and noise efficiency.

Windows with single panes of glass are the greatest source of heat loss and gain in the home – approximately 40% of the thermal energy lost by a home in winter, and gained by a home in summer, in fact.

Ecostar’s 4mm Interior low-e coating pane reflects heat back into your room, significantly reducing the amount of heat escaping in winter and conversely in summer, our double glazed windows deflect 82% of the sun’s heat away from your home, so you don’t have to rely so much on artificial cooling or heating.

Normal painted timber windows and door frames can split, crack, fade and peel; allowing warm air in during summer and out during winter. On the other hand, aluminium window and door frames expand and contract, conducting heat and cold into your home.


Many homeowners fail to take these flaws into account when they’re thinking about renovations, and that’s their first mistake! Unlike wood and aluminium alternatives, Ecostar’s UV stabilised uPVC double glazing does not rust or rot, and won’t succumb to termite attack! This, along with the benefits I mentioned at the start of the blog (I can’t help myself!), means you can spend more time on doing the things you love and less time (and money) on home maintenance.

Which brings me to the cost of double glazing. I’m not going to sugarcoat it; it is an investment, and one that you must of course weigh up. However, while it may take time to recoup your initial outlay, double glazing is a one-time investment, and one that adds longevity (and significant value) to your home.

So, while it’s a decision that should not be made lightly, choosing UV stabilised uPVC double glazing when it’s time to upgrade your home, is a decision that will pay off, not only for your home, but for your family and the environment, and that sounds pretty good to me.


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