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Ground floor I wouldn't unless you get underneath and insulate them, make sure sedum air vents working well etc. Lots of folk block them up when thru spot their carpet coming to life on a windy night.
Upper floors sealing not so important unless you've got draughts from somewhere. But proper floor on the bare boards is prefable all around.
BrickMan
Looking at ripping out the old smelly carpet and sanding the floorboards in the house we've just bought.
Has anyone used draughtex https://www.draughtex.co.uk/ for sealing the floorboard gaps ?