Sealed Unit Double Glazing Facts

Is double glazing a sealed unit?

The double glazed sealed unit is made up of two panes of glass. These panes make up a sealed unit with about 16mm-20mm between them. This gap is airtight and effectively makes the door or window insulated. This means that, based on its heat efficiency, the unit can reduce heat loss through the sealed unit.

How long should a sealed double glazed unit last?

The general consensus on double glazing lifespan is estimated to be anything between 20 and 35 years depending on the supplier and the fitter. Others even suggest up to and above 40 years in some cases.

How are double glazed units sealed?

Double glazing is made by putting two panes of glass together with a thermally efficient spacer bar in between that is slightly smaller than the overall dimensions of the glass to form a gap between them. The glass is then sealed together using a hot melt adhesive to form a double glazed unit.

How do you fix double glazed sealed units?

To repair the issue, one method uses a desiccant to absorb the moisture. A small hole is drilled to access the glass pane unit. A special drying agent is then injected or pumped into the hole to help dry out the window. An anti-fogging agent can also be added to help avoid the problem in the future.


  • No comments yet.
  • Add a comment
    Glazing Network - Logo

    Great, Let’s Get You Connected with Glazing Professionals & Receive Up To 3 Quotations

    Please complete your enquiry and we’ll refer you to the best matched glazing
    companies based on your requirements.

    add photos (optional)

    Thanks for sending your enquiry. You will be contacted by the relevant company/companies shortly.