Insulate storeroom ceiling under upstairs lounge

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29 Oct 2025
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I have a plasterboarded ceiling which I need to insulate to make the lounge above warmer. The plasterboard is 2 x 12.5mm and skim and I don't want to remove it. I also can't use anything with foil (disrupts a zigbee signal to Octopus) and am looking at fixing rockwool batts direct to the ceiling. Not sure if I need a vapour barrier between plasterboard and rockwool - appreciate advice on this please.
 
Lift the lounge floor.

The cold will be coming from draughts.
 

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