Plasterboards and condensation

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Leicestershire
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United Kingdom
I'm replacing old plaster inside a 1940s semi - most if it is falling off from the brickwork.

The walls are all cavity insulated and I am drylining them with plasterboard stuck with DryFix made by Pink Grip. The plasterboard edges are then jointed with compound, sanded, primed (2 coats) and eventually painted.

However, the dryfix foam creates about a 7mm gap between wall and plasterboard and I just want to know if this gap will lead to mould/condensation forming on colder walls where the heat will be passing through the plasterboard to the outside world.

I'm not using foam backed insulated platerboards because I do not want to lose 60mm from the current room perimeter. Also the primer I'm using reckons that 2 coats will create a vapour barrier. Will this work, or will I be cursing my methodology in years to come?

Not hiring plasters due to the shock of how rubbish and expensive they were when they made my kitchen ceiling look like a patchwork quilt.
 
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If you have cavity insulation, you should not have a problems.
Just make sure you apply the dry-fix, so the adhesive forms a complete seal of the board.
 

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