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Glazing Performance

How glass works

Glass is the only building material that not only insulates us from temperature extremes, it can also control the passage of light and heat into and out of our homes. A better understanding of how glass works can help you to make the right selection for your windows.

There are 3 main areas to consider when thinking about windows and glazing for your home:

  • Natural light. By choosing the right performance glass you can enjoy your views and natural light while controlling UV and glare.
  • Solar heat gain. Solar heat is generated when sunlight passes through a window and heats the surfaces and air inside a home. Depending where you live homes can benefit from the natural warming effect of solar heat during winter and its reduction during summer. Good design and the appropriate selection of performance glass for the window's orientation can keep the home cooler in summer and warmer in winter.
  • Thermal conductivity. When there's a difference in temperature between the inside and outside of your home you have heat flow. The greater the difference between the outside and inside temperature, the greater the heat flow, especially through windows using ordinary single glazing. The right performance glass dramatically improves the insulation and energy efficiency performance of the window.

Orientation and style

Where you live largely determines the main task your windows need to perform.

By understanding your climate's heating and cooling needs, you can determine your overall glass selection priorities. As we don't always have complete control over our home's orientation, performance glass can also help to overcome site limitations so you can still enjoy your views without compromising your home's energy efficiency.

Choose the right glass for your home

Use this selection table to compare the bands of performance of different glass configurations; it is a guide only and does not seek to show absolute performance data.

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