Garage conversion into utility room

[Abeer khan]

I am near to starting a garage conversion.  However I am receiving different / confusing information with regard to the stud walls and a Vapour Membrane.

 

Q - Is the vapour membrane attached to the stud work on top of the insulation on the inside of the building before I plasterboard or is the VM attached to the stud work on brick side of the stud. 

 

I also intend to insulate the roof of the garage,

 

Q - when I do insulate do I make an air gap or is the insulation pushed up tight to the OSB underside of the garage roof then attach a membrane before I plaster board ?

 

Any advice would be appreciated,  thanks in advance. 

[tonyshouse]

Always on the warm side of the insulation