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Glass Window technologies

Windows are among the most complex building components in a house, and at several hundred dollars or more apiece, also among the most expensive. In addition to the important architectural contribution they make, windows have far-reaching energy consequences. Their number, total area, and orientation to the sun can make or break the energy efficiency of a high-performance home.

Homeowners love windows — the light they bring, the views they frame, the feel they give to homes. Energy experts hate windows — the heat they bring, the heat they drain, the added energy consumption they cause. The race is on to develop the technology that will allow homeowners to place windows wherever they want without fear of skyrocketing energy costs.

Windows have continued to improve over the years, first with insulated glass units that provided a buffer zone of air between two panes of glass to reduce the heat loss incurred by single pane units during cold weather. Improvements continued with the advent of low-e or low emissivity coatings. These microthin metallic coatings reflect heat, sending it back where it came from. Low-e coatings significantly improve the thermal quality of insulated glass units, helping homes to stay warmer in the winter and cooler in the summer. Adding argon or krypton gas fill between these coated panes adds to the insulative properties of the window unit. 

Clear Glass

Clear GlassClear Glass is a way of creating an insulating layer between two panes of glass. This insulating layer can be normal air or special heavy gasses. Clear Glass lets in as much sunlight as single-glazed windows, but holds in the heat much better.

Clear Glass is standard in most new houses, but it's also worth thinking about adding double glazing any time that you are renovating an existing home. If you need to prioritise, install double glazing to the main heated areas of the house and where there are large windows.

Good Clear Glass windows:

  • can halve the heat loss through the window
  • significantly improve thermal comfort of your home
  • reduce external noise, and
  • reduce condensation build up in cold weather.

Low E-Glass

To keep the sun's heat out of the house (for hot climates, east and west-facing windows, and unshaded south-facing windows), the low-E coating should be applied to the outside pane of glass. If the windows are designed to provide heat energy in the winter and keep heat inside the house (typical of cold climates), the Low-E coating should be applied to the inside pane of glass.

Low E-Glass


Triple Glass

Triple GlassTriple Glass is today standard for energy efficient windows. The difference between double glazing is vast, particularly because of the extra air gap between the panes. Triple Glass is the solution for large windows, that used to mean major heat loss in winter. Triple glazed windows now make it possible to build with light and space, which is widely used in modern homes.

You can have windows from floor to ceiling if you have triple glazed windows with low U-values. The term U-value is a measure of the heat-insulating properties of various building materials, such as windows. A low value means that the material insulates well. Triple Glass has several windows with triple glazing and a U-value of 1.0 or lower.

In windows with triple glazing the glass is a merged package. In Triple Glass's windows there are gaps in the triple glazed insulating glass unit that also is filled with insulating argon gas that reduces heat loss. The insulation glass package also have one or more thin layers of metals such as silver oxide, known as low emissivity layer. This is invisible and reflects a significant part of thermal radiation. Insulated glass with low emissivity layer is usually called energy glass whether it be double or triple glazing, even though the energy savings for a triple glazed unit is much better.

Triple Glass has several windows with triple glazing in the model range. Most energy efficient is Elit Passiv, a window with triple-glazed units. The window has a U value of 0.8 and the level of insulation is so great that it works in so-called passive houses that are built to manage the heating most of the year, without adding any thermal energy.

Super Spacer

Super Spacer

Super Spacer® Premium Plus and Premium High-quality silicone foam spacer. Silicone is well known for its superior resistance to ozone, sunlight and oxidation and is very color stable. Maintains excellent flexibility at low temperatures, has outstanding resistance to high heat and has a low compression set.

New Science: Your upgrade should bring you abundant light, fresh air, soundproofing, and decorative beauty. Advanced technology has discarded the use of highly conductive metal materials, like perimeter spacers made of aluminum or steel. Instead, thermo-set rubber spacers - made entirely from polymer structural foam - deliver not only precise indoor environment control, but also superior sound insulation, as well as suppleness to create and window shape and size. Perhaps more importantly, foam spacers help control condensation, which is a trigger for unhealthy mold growth.

Lower Energy Bills: To reduce heat loss, look for a "no-metal" component and for units made with glazed glass, argon gas fills and low-e coatings to conserve the radiation of heat and light. Energy efficient windows and doors control home operating costs.

Help Conserve: High performance windows and doors with durable materials help to cut back on energy use. To maintain the warmest overall surface temperature, avoid metal materials as mentioned above. The all-foam, Super Spacer for example, conducts heat (and cold) at a rate over 950 times lower than aluminum and 85 times less than stainless steel

Top Quality: For long-lasting durability along window edges, avoid metal, but also avoid plastic. Spacer material must allow expansion and contraction at the edge of the glass. The ridgity of plastic can cause seal failure and it can literally crack the glass edges on extremely cold or hot days.

The Environment: High performance windows conserve energy and therefore help to reduce polluting greenhouse gas emissions. Durable window materials will last longer and minimize future waste.


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