The British Woodworking Federation Group

Narrow Cavity Glazing (IGU) Advice Note

Narrow cavity insulated glazing units are often favoured in listed buildings or conservation areas, as they provide a compromise between energy-efficiency and authenticity. Where narrow cavity insulated glazing units are required, it is important to check they have the correct test evidence in place to ensure they are not subject to premature loss of performance or failure. This advice note provides advice on the details you should ask for from the window and/or glazing manufacturer to ensure compliance.

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