Insulated glass units (IGUs) were developed and introduced into the overseas commercial and residential window markets in the 1930s. IGUs (often referred to as double glazed units) are a combination of two or more panes of glass spaced apart with a spacer bar. The glass panes are then hermetically sealed to form a single unit with one or more air spaces in between. Heat transfer by radiation, conduction and convection is reduced by the extra glass and air barrier that an IGU offers over single glazing. The correctly specified IGU will improve thermal performance which will reduce heating and cooling costs of the dwelling.

Glass panes in an IGU are separated by a ‘spacer’. Spacers can be found in a number of commercially available materials, each of which has an effect on the performance of the IGU.

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Insulated Glass Units
Insulated glazing


Before 1992 most of the spacers were made of aluminum. This material is a great conductor of heat and cold. In summer time it gets hot and increases the chances of seal failure of the window. In winter time it gets cold, making the edges of the window glass colder. That reduces the energy efficiency of the replacement window.

In 1992 IGP glass introduced Intercept Warm Edge Spacer. Intercept features one piece U-shaped alloy, that reduces conducted heat loss. U-shaped system is flexible and does not allow for seal failure.

With warm edge intercept spacer your window is going to expand in summer time and contract in winter. No condensation is going to happen between the window panes as well.


  • Faster cooling or heating times, compared with single-pane alternatives.
  • Enhanced indoor retention of cool air in summer, or warm air in winter, relieving strain on heating systems and air conditioners.
  • More consistent internal temperatures, offering greater levels of comfort to building occupants.
  • Reduced noise ingress.
  • Improved asset saleability.
  • Diminished energy loss due to unwanted draughts.
  • At IGP GLASS we are qualified to assist specifiers with preferred configurations and specifications to achieve desired energy rating benchmarks. Variables such as glass selection and performance values, glazing treatments and styles, sizing, cavity spacings and materials are all addressed holistically to ensure completed fittings are compliant with all relevant Canadian standards and building codes.

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