Renovated Chateau Cranky a couple of years ago, incorporating insulation (batts) in all walls and roof areas. The certifier was fullsome in his praise of the installers work.
The place has always since seemed to require more heating and cooling than I would have expected from the insulation installed.
We do have some uncurtained glass, so in an attempt to track down heat loss/gain, I used one of those infrared temperature measuring guns. I was suprised to find that virtually all surfaces were similar temperature, but that the floor was several degrees cooler.
The floor is wood, 19mm thick floorboards, layed on top of the existing 19mm pine floor. I would expect 38mm of wood to be a fairly good insulator, but this appears not to be the case.
How does one increase the insulating abilities of a wooden floor? Access underneath is relatively easy.