About Hermetically sealed window unit installation

An insulating glass unit is two or more panes of glass spaced apart and sealed in a factory with dry air in the unit cavity. The air may then be flushed out and replaced with a range of other gases to improve thermal or acoustic performance.

The specification of hermetically sealed glass units is not always a straightforward matter; there are many issues in the design and manufacture of these components that are often overlooked or simply misunderstood. The appropriate British Standard, BS 5713, fails to guide the specifier in any meaningful way. This note lists the items that the specifier might need to consider and possible alternatives.

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