What is Double Glazing? The Quick Facts
By Resident Builder Peter Wolfkamp

Thankfully, double glazing is increasingly common and with the recent improvements to H1 of the Building Code, double glazing will be in new homes from now on. However, double glazing was a rarity when I started building in 1987 and every now and then, I need to remind myself about how it works and what benefits it brings.

Double glazing is a type of window that is made up of two panes of glass, separated by a space, typically filled with air or an inert gas like argon.

This creates a thermal insulation barrier that reduces heat transfer and helps regulate the temperature inside the building.

The use of double glazing can improve the energy efficiency of a building, reducing heating and cooling costs and making the interior more comfortable.

In addition to its insulation properties, double glazing can also reduce noise from outside and improve the overall security of the building.

What Are The Key Components Of Double Glazing?

Double glazing comprises of:

1. Two panes of glass – one exterior, with surface 1, and one interior pane with surfaces 3 and 4 effectively counted from the outside in.

For added insulation Metro Low E (low emissivity) protective coating is applied to surface 2.

2. An inert gas that separates the two glass panes

A double-glazed unit can vary in thickness depending on the spacer used in between the glass and also the thickness of the glass used.

Thicker glass, and/or laminates, are used for high wind zones, safety and sound reduction.

Another way to further insulate your double-glazed unit is to use Metro’s thermal spacer, this combined with the right glass type can ensure the maximum performance of your unit.

What Gas Is Used In Double Glazed Windows?

For standard or classic double glazing the gas inside the unit is air.

Argon, a denser gas than air, can also be used to further improve thermal insulation performance.

Before deciding to install retrofit double glazing, it’s a good idea to consult with a professional window installer, to determine if it’s the right solution for your home and to discuss the potential benefits and costs.

This will help you make an informed decision and ensure that you get the most out of your retrofit double-glazing investment. You can do that by giving us a call at 0800 658 658, or better, find your nearest Retrofit store here and get 1-1 advice.

Don’t Forget to Check Out: How Does Retrofit Double Glazing Work?