"Freckles" wrote in message
. ..
My bedroom is over my garage. The bedroom stays cold in the winter and hot
in the summer.

I want to have a layer of solid insulation put up on the ceiling in the
garage.

Has anyone done this and if so did it help very much?
What RF factor insulation would you recommend?

Is the ceiling presently sheetrock? If so, look at some blown in
insulation if there is none in there now. If you use foam panels on the
outside, it should be covered with sheetrock to meet code. As for R value,
as much as you can.