I live in MD, have an insulated floor in the attic but no insulation on the rafters. The house has a slate roof and I don't see any attic vents. Should I: (1) add insulation to the attic floor? (2) insulate the rafters? (3) add vents to the gable ends (brick/masonry construction)?
I'll definitely do what I can to seal leaks from main house such as around attic stairs, ceiling fixtures, etc.