Did they just put the floorboards back on top or was there another thin layer?
Floorboards just go back on once the insulation has been fitted in between the joists. If its gaps your concerned about and you want to keep the bare floorboards then either replace boards or get slivers to fill the gaps
Okay that makes sense. No I was more thinking around whether you'd need to add another layer to prevent condensation etc ...
Also, some people seem to use rock wool and some PIR boards, is there a better option?
Floorboards just go back on once the insulation has been fitted in between the joists.
This.
Also replaced some damaged wood, they also managed to put less gap in the floorboard by adding one more to it so there's no unseemly gap.
@musa started
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Did they just put the floorboards back on top or was there another thin layer?