If the head of the secondary window has to be fitted to a new suspended ceiling the bulkhead detail should be designed to give firm support and, if noise insulation is important, the bulkhead should be acoustically treated to avoid external noise travelling through the ceiling void.
If an existing bulkhead or suspended ceiling does not provide sufficient support or integrity, ties must be introduced between the head fixing point of the secondary glazing and the structure. The illustration shows a detail for a ceiling fixed across the face of a window reveal.
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Guidance