If you have an older home, you may be able to upgrade your windows without completely replacing them with new double glazed units. This will depend on the type and condition of your existing single glazed windows. Secondary glazing works by forming a sealed, insulating air gap on the inside of existing, single glazed windows. To work properly, there should be at least 1 cm between the existing and secondary glass.
Options for secondary glazing
There are a number of options available in New Zealand, including:
- installing a new double glazed glass unit into the existing sash
- replacing existing sashes with new, double glazed sashes
- installing separate aluminium framed secondary glazing on the inside of the existing glazing – typically installed as sliding panes in frames fixed to the internal window sill, jamb and head reveals
- DIY window insulation kits – heat-shrinkable thin plastic film that is attached to the window sash or frame using double sided, adhesive tape. This can be an alternative option in rented houses
- acrylic sheet magnetically attached to the inside of the existing window sash or frame.
Not all of these options are suitable for every glazing situation so check with us before purchasing.
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