Double glazing is a procedure where the window is prepared by using binary glass panels with a tiny separation between these two panes. The gap between these two panels is generally a couple of millimetres apart and must be sealed. Air trapped between these two panes should be dry. This is guaranteed by use of a moisture absorbing substance then the window is sealed. The air entrapped provides lagging therefore lowers the cost used to heat the building. Thus heating bills reduced with secondary glazing
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