House was build in 1958....I've done alot of remodeling and replaced the insulation in the dinning room and a few bedrooms. Before we bought the house the previous owners build an addition, a living room and a bedroom. These two rooms are FREEZING. They didnt leave me room to get under the floor in the new addition....it's a block foundation and I'd have to break out a few blocks to even think about crawling in there on my back. I can barely see under there but it is insulated and has a vapor barrier on the dirt floor. I believe the insulation is R-19. It's also R-19 in the attic which isnt very accessable either. So R-19 must also be in the walls which I cant afford to rip down to check. SO.....I'm considering blown in insulation for the attic and the foam board for the floor if I can get a big enough hole in the block to pull the sheets in there. Am I correct in thinking this will help warm the rooms? And what R value should I be looking at creating? We live in Carver, Ma and it's getting very cold here.