Headliner Insulation - undercoat?

read up on the sound deadener showdown. If youre worried about heat, you'll want a foil backed product. the good ones, heat will only make stick better. For sound control, vibration dampening products like ceramic tiles or the right foil backed stuff in say foot by foot squares in the middle of the panels (in between crossbows for the headliner) should take care of any road/wind/rain noise under a layer of insulation of course. You can go cheap or you can get what you pay for what you get. Sometimes you can get both. I used Rammat and Ensolite, proven effective and better priced than most other big name materials but also not a home depot special.