Draughtproofing behind kingspan and skirting board and wall?

Draughtproofing behind kingspan and skirting board and wall?
I was going to use my old skirting boards in front of the new kingspan insulation but I've noticed that behind where the skirting boards was is a gap which goes down behind the floorboards and a draught whistles up it from downstairs...
Should I somehow seal the gap with some plastic so the draught cant go up behind the kingspan, or use doublesided sticky tape or what to stop the draught?
picture is at
http://www.dicegeorge.com/psb/psimg/hfc-skirting-kingspan-wall-gap20080429.jpg
thanks
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[george]

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George (dicegeorge) wrote:

Yes, whatever works. I went round a load of whistling gaps with decorators caulk..
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