Garage (with room above) insulation

[Northy]

Hi guys,

Our garage is built into our house with our little girls bedroom above it. Basically we've always thought her room was colder than the other bedrooms so this morning I investigated a bit.

I could only see down the holes where the radiator pipes come up but there seems to be little or no insulation between the garage ceiling and the bedroom floor!

I'm gonna have to fix this but probably not until the weather is a bit better, but what's best to use? I've seen that spray foam stuff used on TV, would that be the best? I'm looking to seal and insulate.

There is also a mini roof bit that sticks out above the front of the garage (~4 foot), I'm guessing this area isn't well insulated either.

Is the easiest thing to take the ceiling down in the garage and work upwards?

Cheers,

G