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Whether the boards are nailed or (unlikely) screwed to the joists, it's heavy work to pull up the boards and you'll end up damaging a lot of them. Better to lay your insulation (eg 3 mm expanded foam) over the existing boards and fit extra floor covering over. It's still a lot of work (you will probably have to trim all the doors) but I bloody well wish the neighbours above me would do it.
HarmanMogul
Has anyone fitted insulation under floorboards? I have a suspended floor with exposed floorboards, we don't get drafts through the floorboards as its pretty good condition T&G. But I feel like insulating the floor may make a difference.
Be good to hear if anyone has done it, if it was as hard as I think it could be and whether it made a difference. Thanks