You need to maintain an inch and a half clearance minimum between the bottom of the roof deck and the top of your insulation. That space is for airflow. And you need to be sure you don't block any ventilation from the soffit into the that clearance space, otherwise you'll end up with condensation issues. Without that airspace, moisture will get trapped and will condense and saturate your insulation, damge the ceiling, rot things and generally cause you nightmares. Insulating spaces like that are pretty tough to do in a retrofit. You can't just blow that space full of cellulose fiber or stuff it full of fibreglass. Same with insulating your flat ceilings. Don't put insulation out into the eaves that reaches the roof deck and blocks ventilation from the soffit.
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