I have a flat roofed dormer window and have discoverd that it is very poorly insulated. Its 75mm deep and i was intending on filling with Celotex foam boards but im not sure if it will be enough. What do others think?
OK thanks for the rapid reply, I will fill with 75mm and the consider using some 25mm underneath, but obviously the dormer only covers part of the room so it may look a little odd with a step in the ceiling.
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