I'd like to talk insulation to pick the brains of those in the know.   The attic in my house currently has no insulation at all, a legacy of the failed renovation contractor engagement.  The house has a cathedral ceiling so the "attic" is really just the underside of the roof and is fully open to the rest of the house.  There is no enclosed and sealed attic really.  The red part is the what has no insulation currently.  Actually, there's no insulation on the floor area of the attic eit