Greetings - I was reading through the Q&A about blown in insulation and vapor barriers for older homes, which prompted me to ask a few questions.
My 2 story home in upstate NY has very little insulation. The house has sort of a mansard roof, but it isn't. The outside walls on the 2nd floor are perpendicular but only about 4ft in height. The walls join the sloped roof. The sloped roof (about 10') extends up 45 degrees and meets the horizontal ceiling. The attic has about 1/2" of loose fill that my Dad put in in 1955. One bedroom (there are 5 on the 2nd story) has about 7" of batts above the horizontal ceiling. The house is balloon construction.
I want to insulate the walls, sloped roof, and ceiling in the bedroom we use (eventually the whole house). Since the sloped roof area should probably have an air space between the insulation and the exterior metal roof, would it be better to remove the 3/8" sheet-rock, put in an air channel between the rafters, insulation with vapor backing, and new 1/2" sheet-rock, rather than blown-in in the sloped roof area?
Since the house has balloon construction, blown-in insulation in the walls COULD find it's way all the way down into the walls of the unfinished basement. There are diagonal members (My Dad called them fire-stops) to keep the house "square". Since I'm on a diy budget, I'd rather NOT insulate the whole house right now... just the one bedroom. In my case, would it be better to rip off the sheet-rocked walls in the one bedroom we use on the 2nd story and put in insulation with a vapor barrier?
What do you do for a vapor barrier with blown-in insulation?