We are working on a double brick house which is over 100 yrs old. What is the latest thinking about insulating the walls? They have been stripped of the old plaster and it's just brick. We have put house wrap on the back of new studs in order to put up new walls. Should be insulate inside the studs with the pick stuff or is it necessary? (We will be spraying the ceilings with the closed cell foam insulation.) Could someone send me an answer to this???