Would you recommend installing soffit or low roof vents to improve ventilation, especially since the insulation will be increased and the attic door weatherstripped to reduce convection?
If you only have 7 inches to work with, I recommend two layers of R-15. If you have more space, I recommend two layers of R-30 – one with the facing down and a second layer unfaced going perpendicular to the first. As for ventilation, I recommend having a path for air to flow along the whole roof, including both entrances and exits. I recommend soffit vents. Owens Corning Raft-R-Mate® attic rafter vents will help you achieve an air channel for the soffit vents.
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