Acoustic Efficiency


Single glazed windows allow noise to penetrate your building, whether it is road or traffic noise, environmental noise (construction, lawnmowers, etc.) or people noise. The bricks and concrete used to construct most buildings will provide some noise suppression but single glazed windows let noise both in and out.

Double glazing to your glass windows and doors will substantially reduce the level of noise transmitted – generally by 50% to 75%. Glass type, thickness and the frequency range of the noise itself will all affect how much noise levels are reduced in your individual situation. Double Glazing Australasia can provide specialist advice to help you select and design the best double glazing solution for your project.

Double Glazing Australasia’s AcoustiGlaze system can be implemented into an existing or new building. Established buildings are often well suited to our Sound Barrier Windows, in which a window is fitted inside the window reveal behind the existing window.  This window is a double slider – both panels slide for easy cleaning. The narrow profiles (frames) of the Sound Barrier Window can be powdercoated to match your existing frame colour. For more information please contact us for a brochure.

For new buildings, we recommend our double glazed panels (insulated glass units). We use an edge spacer between two panes of glass to create the predetermined optimum width for the specific application. This glass ‘sandwich’ is then bonded together with a two-part polysulfide sealant. The air space created between the two sheets of glass helps prevent acoustic transfer. We will recommend the correct glass thickness and type of glass during the design phase to suit your specific situation.

Improving the sound insulation of a double glazing window can also be achieved by:

  • Having the widest possible cavity between panes of glass
  • Using thicker glass
  • Differing the thicknesses of the two glass panes used
  • Using an efficient insulating window frame
  • Using specially laminated acoustic glass

Acoustic glass is a sandwich of two or more sheets of glass, heat or pressure bonded together with one or more acoustic polyvinyl butyral (PVB) interlayers. The interlayers act as a noise damper, weakening the energy of the sound waves as they travel through the glass.

To discuss your needs, contact a DGA expert.

Thermal Efficiency


Double glazing is one of the most effective and affordable solutions to climate control in your home or business environment. You will make your building less dependent on artificial heating and cooling, and optimise its energy efficiency, when Double Glazing Australasia installs your thermally and acoustically efficient double glazing system.

The energy saving performance of a window is measured by the Window Energy Rating scale. The most energy efficient windows will depend on the combination of the window frame used and all the components within the double glazing window. Improving the Window Energy Rating is dependant on minimising heat lost from the room and maximising use of solar heat energy.

To reduce heat loss, double glazing window components need to be made of materials that are low thermal conductors. Double glazing windows with the highest performing energy ratings use a combination of Low E glass, warm edge spacer bars and an argon gas-filled cavity, all within a hermetically sealed double glazed unit.

Thermal Glass (Low E)

Glass designed for improving thermal insulation is known as Low E, or low-emissivity glass. Low E glass has a transparent metallic oxide coating which acts almost like a one-way thermal gateway. The coating works by selectively reflecting long wave radiation, characteristic of internal heating sources.

Solar heat gain, which is short-wave energy, can pass through into the room but indoor heating cannot escape to the outside as it is long-wave energy. The coating effectively reflects the room’s radiated heat back in, whilst allowing heat and light from the sun to enter through.

The most efficient double glazed units with Low E glass can now provide up to three times more insulation than standard double glazing window.

Spacer Bar

A spacer bar is the inner frame which separates the two glass panes in a double glazing window.

Spacer bars are typically made of aluminium, but as a metal this means that heat is conducted and lost through its contact between the two glass panels. The colder outside temperature is transmitted across to the inner pane and room heat is transferred from the inner pane to the outside facing pane. The aluminium spacer bar effectively acts as a thermal bridge.

The thermal bridge effect can be overcome by using a ‘warm edge’ spacer bar made of a low thermally conductive material, such as a glass fibre composite. By using a warm edge spacer bar the energy efficiency of a window can be improved by up to 10%.

Air Space

The cavity of a double glazing window plays a key role in energy efficiency. As it is not filled with ‘regular’ atmosphere air, it needs to be hermetically sealed, using special primary and secondary leak-proof seals. The unit is filled with either dehydrated air or an inert gas under vacuum conditions.
Heat is transmitted through adjacent materials (whether they be gases, liquids or solids) by convection, conduction or radiation. The heat is effectively lost from a warmer surface, such as a room-facing pane, to a cooler surface, such as an outdoor facing pane. By filling the cavity of a double glazing window with dehydrated air rather than normal air, heat exchange between the two glass panes is greatly reduced. Molecules of dehydrated air are much less mobile than normal air. This means that they transfer much less heat by convection or conduction and therefore have a better thermal insulation.
Inert gases, such as argon, xenon or krypton have an even lower thermal conductivity than dehydrated air. Energy efficiency can be further enhanced by using an inert gas to fill the cavity of the double glazing window.

CSIRO Research indicates that up to 30% of heat loss and gain can be accounted for by thermal transfer through glass doors and windows. If you improve the thermal performance of your windows, then you will also improve the internal environment of your building and save money on energy bills in the long term.

Modern building trends in the residential and commercial markets mean we are more likely to build upwards on smaller blocks, reducing the use of eaves overhang and limiting your ability to optimise for sun direction when placing windows. DGA’s ThermoGlaze system is a highly effective method of improving the thermal efficiency of your building. Not only will double glazing allow you to meet and exceed the Building Code of Australia’s energy efficiency requirements, it will dramatically improve the living and working conditions in your building.

Find out more about the double glazing process by clicking on Acoustic Efficiency, or to discuss your needs, contact a DGA expert.

SecuraGlaze - Security Essentials  


SecuraGlaze is a strong and versatile option that is particularly resistant to being penetrated when struck. SecuraGlaze provides critical protection in areas where threats and other dangers may arise. If you’re looking to enhance your safety and security than SecuraGlaze is your answer.

DGA’s SecuraGlaze windows are a essential for your protection and security. SecuraGlaze is a strong and versatile option that is particularly resistant to being penetrated when struck. If your looking to enhance your protection and security then SecuraGlaze is your answer.

Replacing the old techniques of bars, and grilles, SecuraGlaze leaves a clear, uninterrupted and most of all,  attractive vision, to give you the most visually and safety-wise. A window tint is also available to enhance your security performance.

SecuraGlaze can be up to 20 times stronger against impact compared to ordinary  glass. This makes SecuraGlaze a valuable addition to any working or living environment where threats are possible and that extra bit of protection is needed. At DGA we are able and more than willing to replace your existing glass with SecuraGlaze  to strengthen it; Creating a secure situation for all without destroying the view.