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In New Zealand, buildings must meet certain energy efficiency standards which vary across the country. For most homes, that will mean single glazing may not satisfy the standard, and instead you will need to use insulated glass units (or IGU).
An IGU is made up of:
• 2 or more panes of glass (of which there are varying types and thicknesses to choose from)
• Held apart by a spacer (standard and thermally improved options are available)
• With the space between the panes of glass filled with air or an inert gas
• And sealed around the edges
Choosing the right glass for your IGU's is as important as choosing the frames.
The right glass can maximise light, reduce heat loss, provide sound protection and minimise fading of your furnishings.
Depending on your individual needs and wishes, there may be a number of glass options right for you.
Please use this table to help you understand which glass you could use.
We recommend you talk to an expert (architect, builder, your Fairview fabricator) to help you make the final choice.
R-value
The thermal resistance of the total window system (including glass, spacer and joinery type). The higher the R-value, the less heat that is lost through the system and the better the insulation.
Argon
A noble gas used inside a double or triple glazed unit. It restricts the transfer of heat and provides greater insulation.
Low-Emissivity (low-e) Glass
An almost invisible coating lets light and energy into your home and reflects heat back indoors, forming a shield against the cold. In warmer climates low-e glass can be used to keep heat out.
Visible Light Transmission
The percentage of visible light transmitted through the glass.
The higher the VLT, the more natural light enters the room.
