text:  If this is the case, you should seal this gap, be it with wood blocking from the attic side or foam insulation, taking care that the foam insulation does not expand into the room and ruin your carpet. The foam insulation is a bit tricky since you are assuming that there's something for there for it to build up against on the other side of the sheetrock and not simply fall down into the attic space. Another item that we find in bonus rooms above the garages is that the insulation between the garage ceiling