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What is double glazing & retrofitting

What is Double Glazing? 

Double glazing from Metro is an Insulated Glass Unit (IGU) that is assembled and sealed in a controlled factory environment.

Having two pieces of glass in the double glazed unit allows each pane to be different to meet varied performance requirements. Combining these two different pieces of glass with gas in between and a Warm Edge 3 spacer bar will give you an even greater level of performance.

Whether you live in Southland, Otago, Hawke’s Bay, Northland or a busy, noisy city, Metro Performance Glass has a range of double glazing options to suit your home. We can also provide high performance double glazing that has thermal performance attributes comparable to that of triple glazing without the added bulk, loss of light transmission or an extra reflective surface.

Double glazing components

1) Double glazing comprises 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) For standard or classic double glazing the gas inside is air. Argon, a denser gas than air, is also available to further improve thermal insulation performance. Krypton gas, only available in Low E Xtreme provides the best thermal insulation performance being a denser gas than Argon.

3) Double glazing units vary in thickness depending on the spacer used and the thickness of the glass. Thicker glass, and/or laminates, are used for high wind zones, safety and sound reduction.

What is Retrofit Double Glazing? 

Retrofit double glazing is the process of replacing your existing single glazing with double glazed units. The process is quick and unobtrusive. The only difference you will notice is a more comfortable temperature all year round.


Retrofit Double Glazing on Aluminium Windows 

This is not a low quality, clip-on solution. Our double glazing solutions are purpose built for each home, and meet the highest construction standards. All materials can be colour matched to suit your existing window frames.

A significant amount of heat is lost through the windows in a house. While this depends on the design and insulation levels of the house. Modern houses with insulation that meets the 2009 building code will lose up to 45% of their internal heat through single glazing. You can reduce the heat loss by up to 33% with classic double glazing, and less than 28% with the Low E double glazed units that RetroFit installs.