Must I batten on top of PIR?

[G and J]

I’m either zoning in on the final details of our wall build up…… or…… I’m spiralling inwards until I disappear up my own rear end…. only time will tell (often at the moment it feels like the latter!).

 

I do know that we will be having a layer of PIR on the inside of our frame, covered by a VCL, then a service void then plasterboard or habito or fermacell.  
 

But I don’t need a service void everywhere, in fact I’ve whole walls without a socket or switch, which leads to my question:

 

Can I, and if I can, is it a good idea, to put up the plasterboard without battens?  i.e. straight onto the top of the PIR?  I presume not, but my assumptions may seem logical to me but keep being proven to be completely bogus.

 

If so I can use more PIR, which is the motivation.  

[Mr Punter]

There is no issue with plasterboard onto the PIR.  You will need longer PB screws.  It is pretty much what you get with thermal laminate board.  I prefer them separately as it means it is possible to separate them at end of their life.

 

Please don't use Fermacell.  Massive ball-ache.