Does any body know which has a higher R value when placed inside exterior walls? Blown-in cellulose, or fiberglass batts? The reason I am asking is because I recently realized that not ALL of my exterior walls are block and brick. Most of them area, but there are a couple that are made up of stud walls. Actually, those with stud walls are in areas of the house where siding was used instead of brick. To insulate the majority of my walls, however, I will have to build new stud walls because most of my walls are solid masonry. I am just debating whether I should blow in insulation in those fews walls where I can, or whether I should remove the plaster and insert fiberglass bats and hang drywall over top (since I will have to hang new drywall just about everywhere else anyway).