Damp Sheathing with Unvented Conditioned Attic
Climate Zone 1a 3300 sq ft home
I am planning on installing open-cell spray foam on the roof rafters and seal the attic. I read the article about damp sheathing and was hoping to avoid it.
1) Do I need to add HVAC supply to the attic to avoid humidity? If so how many CFM?
2) By creating a tight envelope will I need an ERV or a whole-home dehumidifier to bring in fresh air and keep moisture low?
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