We have a cellar (2.7m * 2.6m) below our kitchen, currently there is 40mm SuperQuilt stapled to underside of the floor joists between the cellar & kitchen (not installed particularly well by the looks of it - lots of air gaps, no tape on joints etc).
I'd like to be able to board out the ceiling in the cellar to give it a bit of a better finish, but ultimately it's only for a workshop, not for a livable room.
What approach would you recommend? I'm leaning towards replacing the SuperQuilt with insulation I can fit between joists (wool type or celotex/board type) & then fix the plasterboard straight to the joist. Joists are 160mm. What level of insulation would I need to provide & do I need it to be backed with a vapour barrier? Do I need an air gap above/below the insulation?
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