Blow in cellulose insulation?

[mrbigstuff]

Any reason you can't look into insulating the attic roof and walls? My house is probably closer to Poochies' house and although the attic is unfinished, I would like to finish it one day so I'm probably going to insulate the attic. But, I'm going to have it done via expanding the thickness of the roof rafters from the exterior. I can then come into the house and do an additional layer of insulation in the existing rafters.