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Double Glazing Explained
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Understand how double-glazed units work, what the main components do and how different specifications affect heat loss, condensation and overall performance.
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Double glazing uses two panes of glass separated by a sealed cavity to reduce heat loss and noise transmission. This guide explains the role of spacer bars, gas fills and low-E coatings, and how those choices influence U-values, condensation resistance and overall performance.
It helps self-builders compare specifications rather than relying on headline claims. Our window U-values guide explains how the complete window is assessed. For the official energy-efficiency requirements, see Approved Document L.
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