Cold bedroom above garage. Options?

our main bedroom is freezing as its above a double garage. The roof is flat and plastered but needs more insulation imo. Can I literally stick a load of king span pieces to the roof? Will it help or is there a better way? I don't want to break out a big job. I'm no pro but I could make a decent job of sticking some boards up I think... Opinions?

Insulation is definitely going to help but the best type to use and the best way to fix it is another matter...

Will help but most heat is lost thru windows, roofs, do you have adequate insulation above the bedroom? Radiator must also be correct size for the conditions of the room.http://www.radcalcer.co.uk/

I would definitely check what sort of insulation you have above the bedroom, you would be surprised how much difference a extra layer of insulation above the room will make.
Another thing to think about is to have triple glazed panes fitted into your double glazed Windows ( if you have them ) , they reflect a lot of warmth back into the room.

Mike

Just dry-line the entire room with Cellotex between battens and finish with ploystyrene-backed plasterboard. We had the same problem and dry-lining has transformed the room into the cosiest in the house, even the 750 watts from the cooling fan of my son's gaming computer keeps it warm.

You probably aren't loosing much heat due to it being above a garage. You don't give many details but I am guessing its a newer house if it has an integral garage. Newer houses will actually have better insulation between a bedroom and an integral garage below due to building regulations related to fire and heat insulation, You should have 14mm plasterboard on the garage roof and will probably have 50mm (or more) kingspan or equivalent already. Even if you don't you aren't loosing much heat through the floor. Best look to the bedroom roof, windows, walls (in that order) as others already suggested. Yes you could stick kingspan to the ceiling but it would look like absolute crap. Someone suggested cellotex between any stud wall battens. That would help but means you have to rip apart all stud walls, add the cellotex (Cellotex = Kingspan equivalen btw) and redecorate everything. I guess that is outside your budget if you are even thinking about sticking kingspan to the ceiling. More information is needed - is this a loft conversion, or a modern house where the top floor is basically a loft (like mine). Are there any exterior walls in the bedroom and what are they - cavity walls, solid or what?

*Note Cellotex and Kingspan are good insulators but are frigging bad for the environment in terms of how they are produced.