Batten and Board - Fitting the Vapour Layer

[MICH43L]

Hi

I'm currently renovating my bathroom. Taken all the walls back to brick, and started to overboard the artex ceiling.

I'm going to batten and board all the walls, infilled with kingspan, and I have bought a vapour layer to prevent moisture condensing on the insulation.

2 questions, really.

1. How do I fit the Vapour Layer?
2. Do I need to fit it to more than just the exterior walls? (Ceiling / interior walls)

Seems to me that no matter how you fit it, there wont be a good seal as moisture can make its way under floors / over ceilings etc.

Any tips much appreciated..

 

[^woody^]

If you have the receipt for the vapour barrier, take it back as you don't need it.