high tech insulation
i have a 100 year old home that has very little insulation. the best that i can find is about two inches of cray faced batt that seems to be made out of hair and straw, in the walls and under the floor in the attic. note the attic is not vented through sofit. (yet)
also a tid bit of info needed for the reader is the roof line extends into the living space. or rather cutting through the closets on either side of the upstairs.
my plan is to rip up the floor in the attic remove the hair and straw and use blow in for that, as for the walls \ roof in the closets i'm thinking of removing the plaster, to access the outside walls where the wall meets the roof. creating a space for air to travel along the inside of the roof. by drilling some holes directly under the roof boards to the outside, then insulating with two inches of polystyrene, leaving approx two inches above that for air to travel upwards. then before replacing the sheet rock, i'm thinking of using a layer of reflective or reflecex as both a vapor barrier and as insulation.
of course every manufacturer will tell me the same thing. that useing their product will be the best ever. therefore im looking for the approval of some seasoned vets.
would r-5 polystyrene plus r -13 reflecex give me the money saving insulation that i'm looking for or will i be just sweating in the summer, freezing in the winter?