Double Glazed Sealed Units

double glazed unitsDouble or Triple Glazed Units

In simple terms a glass sealed unit is two or more pieces of glass glued together with a gap in between to help create an insulating barrier to the outside weather. Around half of the glass we create ends up as a double glazed sealed unit although we do get requests for triple glazed units from time to time.

There are many different types and ratings of glass sealed units available from Leadbitter Glass such as energy saving units, toughened glass and laminated glass units. This section will help you understand the basics of sealed unit construction. For more information about the new WER (window energy ratings) see Window Energy Ratings

Standard Double Glazed sealed units

A standard double glazed sealed unit is created by placing two pieces of glass together with a spacer bar in between the glass. Common sense will tell you that the further away these two pieces of glass are from each other, the warmer the internal piece of glass will be because the cold diminishes as it conducts across a larger space bar.

Spacer bar sizes range from 6mm to 20mm so when added to glass of 4mm thick, this can give a minimum sealed unit thickness of 14mm and a maximum thickness of 28mm. We can create thicker sealed units if required by using thicker glass such as 6mm glass for example. Inside of the spacer bar are placed small absorbing desiccant beads that help rid the sealed unit of any moisture if any moisture should enter the glazed unit. A glue sealant is then applied to the outside edge of the glass to bond the 2 pieces of glass together and also to keep the spacer bar in place.

PLEASE NOTE: Spacer bar will be visible at around 14mm from the glass edge so this must be taken into account when ordering your glass.

Triple Glazed sealed units

Only a small percentage of customers actually order triple glazed units with us but they may still be the right choice for you. Triple glazed units have a better energy saving rating than double glazed units because there are now 3 pieces of glass for the cold to travel through before it gets into your home. Triple glazed units are almost 50% heavier in weight than a double glazed unit so this needs to be taken into consideration when ordering large windows.

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