"No way would I start from the bottom. It is so much easier to re-due the roof then remove drywall and trim and whatever else is on the ceiling. Other thing not considered is the control of debris, fiberglass, drywall dust, possible mold exposure,…"
"OK next is the insulation has become saturated somewhere and you will have to find the area. I would say it might be time to get a scan of the ceiling for cold spots and to check the area with a non invasive moisture meter. I have found situations…"
"Your problem is in design according to what I see in your first picture. The covered entrance section needs to be completely sealed and vented from the main attic from the inside. The moisture collected below the walk in area or patio is trapped at…"
"Sorry I can't access where it is but your best bet is to remove the plywood and add Closed cell SPF leave a gap below the new applied plywood sheathing and ventilate from the soffit to the ridge vent. this will prevent the ice dams.
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