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Glass SelectionLarge Double Glazed Glass Window

Choosing your glass carefully will add to the interior comfort of your home and savings in energy costs. Standard clear glass was once the only choice available to homeowners. Today there are so many glazing options available. The options shown are some common glass types with an indication of their thermal qualities. The decision in glass selection is usually one of balance between light, heat and fading control (from UV – ultraviolet radiation). The greater the light transmission the less heat and fading are controlled. 

Double glazing offers some sound dampening qualities but the performance is critically dependant on the width of the airspace. More important are its thermal advantages. In the summer double glazing reduces heat and UV entry while in winter it provides good light levels and reduces outward heat loss. 

Solar radiation even through a double glazed unit can still allow unwanted heat to enter windows. Especially on exposed West or North facing elevations Low E glass (Low Emissivity glass) has a reflective metallic film bonded to the glass is often used as single glazing, or within double glazed units to combat this effect.

Double Glazing

Double Glazed Glass Diagram

This commonly used insulated glass unit (IGU) uses panes of standard clear glass with an air gap in between.

Low E Reflective Glass

Reflective Glass Diagram

This looks rather like mirror glass when viewed fron the outside, the result of a metallic coating added during manufacture. Reflective glass is particularly effective in cutting down solar heat gain.

Tinted Glass

Tinted Glass Diagram

Apart from its aesthetic appeal tinted glass is mainly intended to reduce solar heat gain and glare. It provides good heat and UV protection without having the mirrorlike appearance of reflective glass.


Source - Viridian LightBridge

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