Hi, I have a 1955 red all brick bungalow. the interior walls are a very thick plaster board (maybe 1" or more thick). I want to take the walls down to the studs and insulate. There is family debate about taking the brick off the outside. If we keep the brick what is the best insulation (from the inside) between the studs on the outside walls? We will be putting up drywall to finish the room.