Jon wrote:
Hi,

We've got a bedroom above the garage in our eight year old house
which is always 5 deg C colder (or more) than the rest of the house
on cold days. The fact that the bedroom floor is always cold leads me
to believe the insulation requires significant improvement between
the garage ceiling and bedroom floor.

I've read these previous threads which seem sensible:

http://xrl.us/bg5jr (Link to groups.google.co.uk)

and this:

http://xrl.us/bg5jt (Link to www.diynot.com)

What I'd like to know is has anyone suffered with this cold room
above garage syndrome, improved the insulation, and actually fixed
the problem? If you have, can you state what you did and what
materials you used please? I can't pull up the flooring as we've just
had new carpet laid but would be prepared to pull down the plaster
ceiling if necessary.

Possibly not quite the approach you were thinking of - but have you
considered a new mattress?

We changed mattress a while ago and the difference in warmth is amazing.
The one we got has a hefty layer of warm material where the old one
let a breeze through. I haven't used a winter weight duvet this winter -
at all.

The room itself might still freeze (ours is not over a garage) but that
is less of a problem when we are toasty warm in bed.

--
Rod