Insulating a garage

[HAmos]

Hi all, I'm looking to insulate the garage and make it into a bedroom for a rental property. Does anyone know if it is best to build a timber frame and fill with Celotex or equivalent or use insulated plasterboard? Insulated plasterboard would seem simpler and probably work out cheaper so I'm wondering why builders I have had round have suggested stud work and insulate rather than just fix insulated plasterboard to the walls. Any input very welcome, thanks

 

[Notch7]

Needs building regs.

Insulated plasterboard wont provide enough insulation......itll need celetex board, cant remember thickness, prob 80mm or 100mm

 

[noseall]

I'm wondering why builders I have had round have suggested stud work and insulate rather than just fix insulated plasterboard to the walls. Any input very welcome, thanks

It depends upon the spec' of the garage walls. There are lots of variables i.e. single skin, 225mm masonry, cavity masonry, insulated cavity masonry etc. You haven't said whether this is a stand alone garage, integral or partial integral either.

 

[HAmos]

Thanks noseall. It is an integrated garage, below an existing bedroom. There are cavity masonry walls ( but not insulated cavity). The current floor is solid concrete, could I build s timber frame in the floor and insulate that or would I need to screed it?