How do I insulate my flat roof

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I have a bedroom with was a 1960s extension above an unheated garage.
The specs are as follows: 3 external walls (probably single brick but not sure), recently refelted flat roof, and unheated garage below.

I want to insulate as it gets very cold, but don't know the best approach. I do not want to add wall-lining as the room is not very big to begin with. I do not want to install a new roof as it has only just been re-felted.

I think my best options would be to add a 'warm roof' external insulation system (roof cannot be seen so appearance is not an issue), or to add insulation (Celotex) to the garage ceiling below (head-height is already quite low)?

I know heat rises but do not know which approach would be more efficient (insulate bedroom roof or garage floor below)?

Please can somebody help?

Thanks in advance

Thanks in advance.
 
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I guess insulating the roof would be better but frankly there's little point unless you address the walls.
 
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External walls can be insulated from the outside by fitting polymer boards and k-rending over them, then insulate the roof and garage celing :eek:
 
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I guess insulating the roof would be better but frankly there's little point unless you address the walls.

The walls do feel cold, and have double glazing at both ends (no draughts, pretty sound), so the walls appear to be double-brick width - certainly at the window ends. So to me they shouldn't be any less insulated than the rest of the house?

Floor definately feels cold (carpeted), and walls cold to touch too.
 
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External walls can be insulated from the outside by fitting polymer boards and k-rending over them, then insulate the roof and garage celing :eek:

Side of house is pebble-dashed, and built so close to neighbouring property I doubt you could even get a ladder up there (always scaffolding I suppose).

Would this not stick-out and look odd to rest of side (ie below it)?
 
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I guess insulating the roof would be better but frankly there's little point unless you address the walls.

So to me they shouldn't be any less insulated than the rest of the house?

.
indeed - but that narrow gap between the houses is where the wind will speed up - particularly if the prevailing wind faces the narrow gap. higher the speed -more the drop in temp. Think carburettor icing ;)
 

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