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Garage conversion internal wall insulation


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I'm looking in to converting a detached garage to a living space. The wall construction is 200mm lightweight blockwork rendered externally.




As the garage goes right up to the boundary my only option is internal wall insulation. I will need multiple things attached securely to the wall (toilet, boiler, sink etc) so I think insulated plasterboard is going to be too much of a pain to use. 


If I use internal studwork with foil backed PIR between studs does anyone have an idea of the best construction for this which will achieve a 0.28 u-value or lower to satisfy building regs?


I was thinking of 100mm studs with

  • 75mm foil backed insulation pressed up to block work
  • 25mm void
  • OSB board pattress where strong fixings are required
  • 300GA Vapour Barrier
  • 12.5mm Gyproc Wallboard
  • Plaster Skim


Questions are:

  1. Does this sound sensible?
  2. Would it be better to have insulation flush with front of studs?
  3. Can I use the 25m void to run cables/pipes? 





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