"eddie" wrote in message
om...
Hi all
Is it ok to to fix kingspan insulation boards directly on to the wall
without having to use battons, and as these boards have a foil backing
on them can i just fix plasterboard straight on to them without having
to use a vapor barrier.

You can do, but the wall may then retain moisture that used to evaporate. I
would use battens and a 1" cavity, or thick lumps of plaster adhesive,
removing the foil and digging a small crater for the dabs to get adhesion.