What is retrofit double glazing?

Retrofit double glazing is the process of retrospectively fitting new energy efficient double glazing into existing window frames that previously held single glass. The process involves removal of the inefficient single glass and small changes to the existing frames which may include changing the timber or aluminium beads to accommodate double glazing. However, unlike alternative options available, these small changes will be almost un-noticeable, resulting in a finished product that maintains the authenticity of your existing windows.

This means that:

• Timber window frames are kept consistent without having any additions that compromise the aesthetics and insulation performance.
• Aluminium window frames are kept consistent including functionality of opening windows and doors.

The retroGLAZE^® system was developed to provide existing homes with the benefits of double glazing without requiring the entire replacement of their joinery.

Windows have components that wear over time. This includes items like window handles/ catches, stays/ hinges, gaskets and draught seals. As part of ‘retroglazing’, the required maintenance and optional upgrading of hardware are carried out. The outcome is that the windows and doors are refurbished and double-glazed all at once.

A number of alternatives are often confused with retrofit double glazing, including:

Where new aluminium-framed double-glazed windows are inserted into existing timber frames. This can be a useful alternative where the timber joinery has been under-maintained and subject to deterioration, or where the authenticity of the timber character is not important to the homeowner.

Insert double glazing more appropriately fits into the category of replacement window and doors (which are double glazed).  Refer: "Should I retrofit or replace my windows - which option is right for my home?"

Where a piece of glass or perspex is fitted to the existing single-glazed window. The lack of an effective seal means that moisture, dust and mould can occur between the two panes. Often portrayed as a cheaper alternative, it can prove to be significantly more costly.

In buying products together with an installation service, for an existing home, there is more ‘to get right’. The retroGLAZE^® double glazing system was developed for this reason.  We believe that homeowners should be able to have quality products installed correctly with excellent service.