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Product Types | Double Glazed


A double glazed window is commonly a factory sealed unit which has two layers (panes) of glass that is separated by an air space that is a pane of glass/air gap/pane of glass. A double glazed unit has been sealed so that the air in between the glass sheet is thoroughly dried and the space is air tight, assisting in the elimination of condensation, plus provides good energy efficiency properties and helps keep noise pollution down.


Factory made units contain dry air between the layers of glass, a desiccant (silica gel) to absorb any moisture likely to cause condensation and are usually double sealed. These are manufactured to order, some options available are alternative gases for filling double-glazed units, with the most common being argon and SS6 gas. Argon increases the performance of units by around 20% due to its lower conductivity than air while SS6 gas is used to help reduce noise transmission.


Double glazing substantially reduce winter heat loss


IGU's (Integrated Glazed Units) consists of two or more panels of glass separated by an air space and some type of spacer around the edges.  An example of a commonly used double glazed unit is 5-8-5 (18mm) which is 5mm glass with an 8mm air gap and 5mm glass. The spacer contains a desiccant (drying agent) which eliminates moisture vapour in the cavity.  The combination of the two panels of glass and the trapped air is what makes IGU's a superior energy efficient method of glazing.  The IGU can perform a thermal and noise insulating function.  The narrowest air gap used is 6mm, but wider gaps (10-20mm) will improve performance.  For greater performance one of the glass panels should have a low-e coating and argon gas between the panes.

Commercial Building with Double Glazing
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