I just moved into a 60 year old 900 square ft, rambler in Maryland. I have a newer oil furnace, original drafty windows, 6 inches of old blown insulation in the attic with a tongue and grove floor above it, and no insulation in my plaster walls. I am a carpenter/roofer part time, and I am looking for some advice on how to insulate the place. It needs a new roof and siding in the spring. I am currently planning on adding a couple inches of spray foam to the underside of the roof deck, to seal everything. Then I am going to add 4 inches of rigid foam to the top of the roof deck, add plywood, and shingle it. For the walls I was planning on blowing loose pack celluse from the exterior, and then sheathing it in 2 inch rigid foam board, then wrapping that with a vapor and water resistant barrier, then vinyl siding. I'll probably replace my windows with builder grade vinyl when I re-side the place. I can't pull the floor in the attic, this house is less than 1/2 the size of our last house and my wife would kill me if I took that storage from her. It is only a 4/12 pitch so the headroom is limited as is.