Insulating 1960's bungalow dormer bedroom and loft

17 Nov 2023
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United Kingdom

Looking for some advice and comments on insulating an old 1960's bungalow, specifically the loft area which has been split and one side converted into a dormer room.
Essentially one side is the old loft area, and the other was converted and is the older style dormer room (pic attached).

I intend to strip it back to the rafters and install celetex in the walls prior to plasterboard and skimming.
Question is, should I put insulation under the floor, below is the lounge, and if so do i need to leave an air gap?

Also, I am planning on wool insulation in the loft joists, 100mm between and 200mm across, then chipboard on top, again should i leave an air gap between wool insulation and chip board flooring?



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