I have a room over an attached garage which gets much colder than the rest of the rooms. I think there is no insulation in the garage ceiling (I haven’t checked it yet). I saw some suggestions online and some of them mention taking the drywall off and using spray foam. I do not want to go that route since it will be costly option.
What I am thinking of doing is have someone use blown in insulation in the garage ceiling or take down the drywall and put the foam board between the joists, then seal it with spray foam from a can, and then put batt style insulation and put the drywall back and finish it. Is this still a good option?